Sbc Idles Up And Down

Timing the ignition, then, is a matter of getting the timing correct at one end (idle or full advance) and letting the rest of the range look after itself. Answer: As with any air conditioning problem, freon level is the first thing to have checked. He thought you all might like to hear how it sounds. If I try to use the AIC to hold a high idle, it will bog down and die. A Chevy V8 with 500 hours should be barely broken in. Rpm's stay up even after the choke is open. 88 chevy 350 low oil pressure at idle when hot but is fine when above idle, or cold. it has a 600 cfm edelbrock carb but when i adjust the idle screw down the engine shuts off. Check the EGR operation - there should be NO EGR at idle. Moved Permanently. Got my hands on a generic reader for now. If any of these is lacking, the engine may stall. This is a large orifice so I would think It would flow enough air. The idle air intake ensures your Silverado maintains a consistent idle, even when it powers vehicle functions. While in park or neutral, my idle is now between 1200 and 1500 rpms and i dont know why. I too have a chevy s10 it idles fine when its cold, but as soon as its warmed up and hot the idle jumps to 3,000 RPM. Another adjustment that will help start-up and idle is to go to the cranking VE table and multiply the whole table by about 80% to lower it. 10 mins or so. Even a slight carbon build-up can cause an extreme vacuum leak internally to the EGR Valve. Dan explained that three to five minutes is usually sufficient for cooling down a diesel engine. If it does remove the Idle Stabilizer / Auxiliary Air Valve, clean it with Carburetor and Choke cleaner, reinstall and check operation. I know the choke is bad ( or at least pretty sure) because it doesnt do anything. 5-2 turns out on both screws. 3-liter was a surge at idle when warmed up. It came back up again within 1 or 2 days. Unfortunately I do not have a live data tool. Excessive lifter preload will cause the motor to idle rough or have low manifold vacuum and can lead to severe engine damage. As long as the shaft has up and down movement, you may proceed with the rest of the distributor installation: add a distributor gasket install the hold-down clamp connect wiring If there is no up and down movement in the shaft, nylon distributor shims (shown above) need to be added until there is 0. I have a code 507, idle control system, rpm higher than expected code. I turned my idle down to troll a bit slower (4 mph was my minimum, I'm down to 2. When i take off it suptters but do does backfire. If you have a bit of a stumble in very light, low speed operation, sometimes it helps to richen it up by another 1/4 turn. Thereby causing the pressure to read as "normal". It is nothing to cry about in my book, so I am not going to do anything about it. Sure enough, it was almost a quart and a half low on ATF. freon low pressure sensor on the accumulator is faulty. The idle speed is self-adjusting itself during driving. Raises idle to 1,200 or 1,800 RPM while in Park to cool or heat the interior more effectively. I changed the spark plugs and wires, coil, and cap, but it's still missing. most of the time it idled just over 1000 rpm. Up and down idle on start up. IAC values are low though, around 30. This is not your '70's oil. Mine idles what i call high but that is probably the way it came and is supposed to act. Ford Style IAC. a dirty mass airflow sensor (MAF). when crank my 1989 gmc 1500 350 engine up it idles up and down like maybe the timing is off but not so. freon low pressure sensor on the accumulator is faulty. (Ride to the bus stop) It seems to idle up then i have to give the pedal that pump to idle down. I have no codes. Ok here is my issue I have a 1993 k1500 with a 5. Sometimes the problem is caused by a gummed up or sticking idle air control valve (IAC) or. I sprayed wd40 around the carb base and intake manifold and found no increase in idle speed identifying a vacuum leak. Operating temperature is stable at 176°. Idles abnormally high, but tries to die out when idle screw is adjusted. With the car off and key out, try to unplug the MAF (it will be in the intake pipe right after the air filter. Combustion engines run at maximum efficency at a certain temperature. A common cause of an idle that hunts up and down on these trucks is a lean fuel mixture, usually from low fuel pressure. First off when i got the car running i had the timing light ready so i could check / set the timing to around 10-16 deg BTDC. Here is a problem for ya! The idle on my truck fluctuates in drive and reverse but not in neutral or park. The 5A heads seemed to appear for a while after '85 in the VIN 9 engine, but there are 7A headded VIN 9 engines too. The main culprit for idle instability is uneven fuel distribution in the intake manifold. This is a large orifice so I would think It would flow enough air. Posted by Anonymous on Oct 01, 2014. The idle does seem to search up and down some. One old man that was seen at a shop i visited had an Olds 88 with 350" and he made an adapter and mounted a weed eater carb to it. General Tech - SBC Crate Engine setup issues - Dropped in a new 350/290 GM Goodwrench Crate engine in our 1986 K10 w/ SM465. 2%, though its sedans performed, on the whole, substantially worse. I would prefer a leaner AFR at around 13. I am used to having to idle larger cammed engines up a little higher but 1400 seems a little much. The next day it acted up again. Find the best used Ford Mustang near you. View Used 2017 Chevrolet Cruze in Burlington, MA. This helps the car warm up faster to reduce NOX (nitrous oxide) emissions. Mine idles what i call high but that is probably the way it came and is supposed to act. Typically I run 15 minutes on plane to get to where I'm going, then alternate 10 minutes of idling with 3-4 minutes of planing for 2-3 hours to do my thing. SOURCE: 2004 f350 6. In 2017 the plant made about 180,000 cars, down from 248,000 in 2013. i shut it off and settled it back down didnt take much to do it but i am now going to let it idle at its normal 750 800 rpm range for. The engine runs fine when cold but as it warms up it starts to "surge" at idle and when you come to a stop it acts like it wants to stall then it grabs. That car should be able to run on the MAP signal alone. over the past few weeks i have gone on little test drives, turning the timing up a little as seems ness. First off when i got the car running i had the timing light ready so i could check / set the timing to around 10-16 deg BTDC. None of this is meant to be adjusted: the manufacturer sets it up for each engine family it builds, based on compression, cam profile, octane requirements and availability, among other things. The tech said it would pass easily with a new cat. Hydraulic - 1 Turn Down from "No Lash" Point: Exhaust: Hydraulic - 1 Turn Down from "No Lash" Point: Ignition Timing (Note 3) 4° BTDC: 8° BTDC: 4° BTDC: Engine RPM: Synchromesh: 450 - 500 RPM: Powerglide (Note 4) 450 - 500 RPM: Fuel Pump: Pressure: 3½ - 4½ PSI: 5¼ - 6½ PSI: Volume: One Pint in 30 - 45 Seconds: Cooling System Radiator. The "good ol' days", really weren't. Chevy s10 pickup idles up and down almost stalls new fule pump filter injector assy new entire intake gasket set. 7 engine with TBI. com FREE DELIVERY possible on eligible purchases. The truck wants to stay around 1500-2000 when moving. I've got a 1. 3 liter vortec v6. We use cookies to give you the best possible experience on our website. Predator 212 idle rpm. The truck idles like crap in park, but idles smooth in drive. If you sit at a light for more than a few moments it will start to idle lower and lower until it stalls. most of the time it idled just over 1000 rpm. The 2003 Chevrolet Cavalier has 14 problems reported for stalls at idle. I have an interesting problem,need a second opinion. 7: while driving truck it started bucking, rpms rapidly going up and down. A common problem on these trucks is the. Sure enough, it was almost a quart and a half low on ATF. > > > The emissions control label on the front of the engine compartment is > > > for the original engine (a 4. The 5A heads seemed to appear for a while after '85 in the VIN 9 engine, but there are 7A headded VIN 9 engines too. But after long hauls you may want to idle the engine for up to seven minutes to allow the manifold to cool down. Problem: excessive corrosion internally on the Engine Coolant Temperature Sens. Have replaced the pmd to a remote pmd(new). Idle speed goes up and down or high idle. Idles ok when started up, but after warmed up it idles really rough when stopped. It is nothing to cry about in my book, so I am not going to do anything about it. 1992 Chevy K1500 5. The truck puts out some black smoke whenI give it some gas, and smells terrible. None of this is meant to be adjusted: the manufacturer sets it up for each engine family it builds, based on compression, cam profile, octane requirements and availability, among other things. Make sure it’s the IAC’s fault. Predator 212 idle rpm. Engine surges Hi, i want you to clean the air intake valve and idle speed control valve, follow the procedure below. Silverado sales were up a bit more than 1 percent through the first nine months of the. « on: May 13, 2011, 11:02:55 PM » Ok well first off I'm new to the sight so hello to everybody and I apologize for asking a question that might have already been answered. 622", 112 LSA using HP Tuners. Sometimes the problem is caused by a gummed up or sticking idle air control valve (IAC) or. OK, say i'm rolling up to a stop light and just want to coast up to it so just bump the shifter into neutral and let off the gas. IDLE TUNING The following is a collection of idle tuning notes, tips ‘n tricks and How-2’s for idle tuning a big cam (or any cam for that matter) that I used when dialing in my 248/254,. Sometimes the problem is caused by a gummed up or sticking idle air control valve (IAC) or. 7 tbi when at idle it has a low to the idle. Also it needs to relearn the idle position after a battery change. What would cause that? I have changed fuel filter, egr valve, IAC valve, TPS sensor, plugs, wires, cap, rotor, coil, rebuild TBI, and have tried adjust the timing with the distributor, but everything i do will not get rid of it. SES light is off. Idle speed goes up and down or high idle. Then I come along and retune it correctly and advance the timing to 22* and idle it down to 1000 RPM, when I moved the idle timing up it also moved the timing up on the other end so now at 2500 RPM your max timing is now 48*look out a melt down is about to occur. I have done some searching within the Forum, however haven't found anything that was. Want Answer 0. 20 minutes roll by and it is still stuck at this high idle, I adjusted the idle mixture screws and even the screw that controls the carburetors idle speed when it is warm on the 1406 and it did absolutely. Excessive lifter preload will cause the motor to idle rough or have low manifold vacuum and can lead to severe engine damage. when you stop say in traffic. The idle air intake ensures your Silverado maintains a consistent idle, even when it powers vehicle functions. I cleand the throttle body with crc throttle body and intake cleaner. The idle does seem to search up and down some. When the AC clutch engages to run the compressor, it places an additional load on the engine. This will give the best build up procedure for a significant Apr 01, 2010 · This cam is designed specifically for the TBI 350 small-block and specs at 194/214 degrees of duration at 0. ) Because of the nature of this valve (large air volume processed) it should be serviced when a tune up is performed. If it does remove the Idle Stabilizer / Auxiliary Air Valve, clean it with Carburetor and Choke cleaner, reinstall and check operation. I figured it occurred when I didn't let the car warm up. When I first start the car, the idle only goes to 800 rpm. Lazy mechanics simply dial up the idle to mask the problem, rather than fixing it. When I put it in gear the RPMs start fluctuating and the truck wants to stall out. also wont shift (electronic) into 4hi. IAC values are low though, around 30. No fancy video stuff here, just one mean sounding American muscle car. If it still doesn't work you will probably have to clean the throttle blade on the throttle body cause it is probably gunked up and won't allow the blade to come to full "seat" position letting it relearn the idle. 3 liter vortec v6. 0L engine and it has been idling rough. It has a 'leg' bent down that rests against the idle stop screw. On the end of the butterfly shaft, the end where the spring is, there's a stamped metal plate. Low oil pressure at idle only, will most often mean that the engine is low on oil. Start it up and let it sit about 10 minutes at idle so it can relearn idle. Hello, I know there are other posts about the surging idle issue and I am just wondering if Fuel pressure regulator is probably what is wrong with my truck before i throw parts at my truck. it has a 600 cfm edelbrock carb but when i adjust the idle screw down the engine shuts off. Here is a problem for ya! The idle on my truck fluctuates in drive and reverse but not in neutral or park. « on: May 13, 2011, 11:02:55 PM » Ok well first off I'm new to the sight so hello to everybody and I apologize for asking a question that might have already been answered. Got my hands on a generic reader for now. 6L Duramax Diesel 2500 & 3500 series trucks. You just need to dial the idle back to spec. If it has not pulled any codes (idiot light). I too have a chevy s10 it idles fine when its cold, but as soon as its warmed up and hot the idle jumps to 3,000 RPM. It's thin, but engineered to do the job of getting everywhere, even with engines set up tight for emissions. it seems to only idle with any consistency around 1400, and honestly it sounds more like 800 with the cam. 5L Chevy turbo diesel, Chevrolet, Cadillac, Buick, and GMC, 20 replies GM to put turbo diesel engines in mid sized pickups starting in 2014, Automotive, 1 replies chevy putting out a diesel cruze, Chevrolet, Cadillac, Buick, and GMC, 125 replies. 1990 chevy truck 350 tbi runs rough at idle up and down and exhaust stinks bad, bad gas milage too - Answered by a verified Chevy Mechanic We use cookies to give you the best possible experience on our website. The idle does seem to search up and down some. 3-liter was a surge at idle when warmed up. 2003 Chevy Silverado low idle and a/c inoperative told to take to dealer and reset computer. The only way I can get the jerking of the car to tone down to a little bit is by putting the car in neutral when I am stopped. Chevy Blazer and GMC Jimmy Questions. In Mid-85, GM changed over to a 307 with 7A cylinder heads and a hydraulic roller-lifter drivetrain. I as well get this rough idle randomly when coming down into the transition to idle speed control. But a low or weak battery is the #1 cause of idle stumble and stall, or a start and immediately stalls upon idle down. It seems worse cold then after it warms up. With gas moderate to heavy, there are no hesitations or surges. I have a 1992 s10 blazer that the engine surges,like idles up and down,but if I pull the vacumm hose on the pcv it will - Answered by a verified Chevy Mechanic We use cookies to give you the best possible experience on our website. In a lot of Mazda and Ford’s the fluctuating idle will actually come from a bad O2 sensor or MAF not the IAC. Mine idles what i call high but that is probably the way it came and is supposed to act. 2003 Chevy Silverado low idle and a/c inoperative told to take to dealer and reset computer. The main culprit for idle instability is uneven fuel distribution in the intake manifold. I'm having the same problems (97 4. Moved Permanently. Every engine needs three things to run and idle smoothly without stalling: a correct air/fuel ratio, sufficient idle speed for the idle load, and a good spark. The tech said it would pass easily with a new cat. 3 with an EGT guage. Updated March 2, 2012 8:32 pm ET General Motors Co. If the surging idle persists, replace the Idle Stabilizer / Auxiliary Air Valve. He also said it isn’t necessary when just running about town without the trailer. Clean your throttle body, and change your spark plugs with A/C Delcos #41-103, most other brands will cause rough idle like Autolites and Bosch. vacuum was plugged off, tried it on ported vacuum as well, still no dice. No codes are coming up. Manifold May 08, 2017 · Rough Idle - Chevy 350 TBI Discussion in 'Engine Performance + Maintenance' started by DerekTheGreat, May 8, 2017. The only way I can get the jerking of the car to tone down to a little bit is by putting the car in neutral when I am stopped. when crank my 1989 gmc 1500 350 engine up it idles up and down like maybe the timing is off but not so. Operating temperature is stable at 176°. It also dips below every 3-4 seconds and comes back up to normal idle. Replaced wires, plugs, distributor cap/rotor, tps, ignition module, map, IAC, engine coolant temp sensor, rebuilt fuel pressure regulator and new alternator. I turned my idle down to troll a bit slower (4 mph was my minimum, I'm down to 2. Revs up litereally by itself after pulling it into neutral, then when i come to a stop it will eventually calm back down and idle at 1000 rpm. 3 5spd 2wd). 5 diesel Chevy when the engine is cold the engine runs fine. The engine runs fine when cold but as it warms up it starts to "surge" at idle and when you come to a stop it acts like it wants to stall then it grabs. I thought I felt the RPMs spike for half a second. 10 mins or so. Any ideas of what to check next?. It could also be the Idle Air Control valve. Ford Style IAC. Fixit! I have had a lot of experience with the older P&W Jt-3 & JT-9 series, GE's and RB211's but that is all history now. Doesn't seem to happen as often as others. Then you have a jetting issue. 94 chevy truck revs up and down from 800 to 1200 in idle. My original problem with my 2004 Silverado 5. It idles rough and actls like it's going to stall. I have had the truck for 17 years and it has about 171 k miles on it Cold it starts up and runs fine. Here is a problem for ya! The idle on my truck fluctuates in drive and reverse but not in neutral or park. 00) for standard gasoline. Clean your throttle body, and change your spark plugs with A/C Delcos #41-103, most other brands will cause rough idle like Autolites and Bosch. it seems to only idle with any consistency around 1400, and honestly it sounds more like 800 with the cam. 1974 1/2 ton 350 sbc; Re: 350 high idle « Reply #7 on: It seems to idle up then i have to give the pedal that pump to idle down. Hi All, I have 2014 Cruze Equip (auto transmission) Australian model. When the engine is warm and pull down the trottle the engine goes in gallop rpm from 600 to 1100 up and down. 5-2 turns out on both screws. Not the case. Ford Style IAC. After sitting, it will start up fine, albiet a little cold out (-3 here today) and then it starting running rough. The idle does seem to search up and down some. 0(Idle circuit you know) but as soon as i put it in gear and touched the throttle ever so slightly it would die. It could also be the Idle Air Control valve. This is not your '70's oil. I tried to pull out vacuum hoses and see if it changes the idle, It does change abit (higher) then I put it back on and then it slightly goes down, but still 3000RPM and you can really smell the fuel. If that fixes it, replace the MAF. IT acts like it is starving for fuel. It is nothing to cry about in my book, so I am not going to do anything about it. Revs up litereally by itself after pulling it into neutral, then when i come to a stop it will eventually calm back down and idle at 1000 rpm. Customer complaint bad gas mileage and a surging condition at idle, sometimes. Yihaojia Men Blouse - T shirts for men polo columbia golf funny dress grunt style swim compression sleeveless untuckit short sleeve button down july up burberry linen heusen cool workout dry fit henley true religion muscle graphic rvca white superman champion slim under armour dad american eagle guy harvey work salt life gym casual western plain batman cooling summer quicksilver men's black. Here are the common cause of surges, cold stalls, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper. it seems to only idle with any consistency around 1400, and honestly it sounds more like 800 with the cam. A common cause of an idle that hunts up and down on these trucks is a lean fuel mixture, usually from low fuel pressure. See the vehicle Emission Control Information label. ok i went over today and drove the truck around. > > > I have an '86 GMC 1/2 ton pick-up that now has a 5. Posted by Anonymous on Oct 01, 2014. Shop Now!. 00) for standard gasoline. loads up and quits. After it warms up, as I am driving and approaching a stop, the car idles at 1100rpm. This helps the car warm up faster to reduce NOX (nitrous oxide) emissions. You may have to remove the EGR Valve to inspect the internal valve. Here are the common cause of surges, cold stalls, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper. If any of these is lacking, the engine may stall. 1992 Chevy K1500 5. If you mixture screw is not out one full turn, something like only 1/2 turn out from seated then your Idle jet is too rich, go down one half size on the idle jet. Car starts on a dime and drives great for about 10 mins just all of a sudden just bogs down and idles really low then finally stalls. When the engine is warm and pull down the trottle the engine goes in gallop rpm from 600 to 1100 up and down. Idles ok when started up, but after warmed up it idles really rough when stopped. Q: What is a rough idle? my car when warming rpms will go up and down sometimes, even at a light after warming it will rev up a bit by itself Fallen41 - 2 Answers my question for members is : what is a rough idle? my car when warming rpms will go up and down sometimes, even at a light after warming it will rev up a bit by itself , please answer. When i pull the transmission in gear it runs fine. With all new gaskets, Jennings installed the Q-jet on his V-8 Chevy dyno engine to make final external air/fuel mixture and idle-speed adjustments. Be careful not to scratch the smooth teflon surfaces. The procedure is to remove one valve cover, plug up the oilholes on the eight rocker arms and start the engine. Hello, i have an 6. The 2003 Chevrolet Cavalier has 14 problems reported for stalls at idle. You may have to remove the EGR Valve to inspect the internal valve. Sometimes the problem is caused by a gummed up or sticking idle air control valve (IAC) or. My pressures don't get quite that low, even during idle periods during heavy towing. Has done this since the day I took it home. 622", 112 LSA using HP Tuners. Cold stalling problems are the most common because the engine needs a richer fuel mixture to maintain idle speed until it warms up. If I try to push on gas it eventually would backfire and smelled rich. Thereby causing the pressure to read as "normal". Lazy mechanics simply dial up the idle to mask the problem, rather than fixing it. Have new install Terminator. I have a Chevy Silverado 2500 with the 6. 7L 350 V8 in it. The motor fails because of carbon buildup and has to be replaced, and the idle will get back to normal. Cam is a 239/245. At idle and light throttle, jeep surges a little. I have a 1992 chevy caprice it has a 350 TBI in it. Check the EGR operation - there should be NO EGR at idle. The only thing I can think of is that it idles higher at the start to warm up the engine. when the car is in motion there is no problem even on the hottest day. Manifold May 08, 2017 · Rough Idle - Chevy 350 TBI Discussion in 'Engine Performance + Maintenance' started by DerekTheGreat, May 8, 2017. It's thin, but engineered to do the job of getting everywhere, even with engines set up tight for emissions. I have an idle problem. I have a 1992 Chevrolet Silverado with a misfire. Idle speed goes up and down or high idle. The 2003 Chevrolet Cavalier has 14 problems reported for stalls at idle. If I try to push on gas it eventually would backfire and smelled rich. 7 tbi when at idle it has a low to the idle. GM style IAC. I, personally, have limited knowledge of engines and vehicles, but many of my friends study the subject and seem to know what they are talking about. I recently bought a 2002 GMC sierra with the 6. 5-2 turns out on both screws. Even a slight carbon build-up can cause an extreme vacuum leak internally to the EGR Valve. I'm having the same problems (97 4. It idles rough and actls like it's going to stall. The motor runs pretty good at idle and cruises good as well, but as soon as you stomp on it, it sputters, backfires and misses. GM will kill off these 6 Chevy, Buick, and Cadillac sedans when it idles select factories in 2019 GM's US sales were down 1. SBC idles great, but wont run under load The motor is a fresh 350 mild street motor, edelbrock carb, msd dist etcall shoved in an s-10. And also when I’m in park trying to smooth it out by hitting the gas the rpms go to rev limiter and then while holding the pedal to the floor drops back to idle. I have a 1992 s10 blazer that the engine surges,like idles up and down,but if I pull the vacumm hose on the pcv it will - Answered by a verified Chevy Mechanic. If it does remove the Idle Stabilizer / Auxiliary Air Valve, clean it with Carburetor and Choke cleaner, reinstall and check operation. First off when i got the car running i had the timing light ready so i could check / set the timing to around 10-16 deg BTDC. Re: 95 Chevy S-10 4. The truck idles like crap in park, but idles smooth in drive. Average repair cost is $250 at 44,550 miles. Hello, i have an 6. Mine idles what i call high but that is probably the way it came and is supposed to act. Want Answer 0. SOURCE: 2002 Chevy Trailblazer idle down cut off when heater or AC is on. Problem: excessive corrosion internally on the Engine Coolant Temperature Sens. The items listed above are the most common causes of a rough idle. Cold stalling problems are the most common because the engine needs a richer fuel mixture to maintain idle speed until it warms up. Only after I'm hauling a load is when I let idle back down to 400 deg. I have an idle problem. 5 diesel Chevy when the engine is cold the engine runs fine. This is caused by the throttle plate not seating properly. it would start right back up and idle a few seconds and die again and this would go on for awhile. Just a few years ago, the factory employed three shifts of workers to churn out Chevy Cruzes. I have had the truck for 17 years and it has about 171 k miles on it Cold it starts up and runs fine. If your mixture screw is out more than one turn like 11/2 turns then your idle jet is too lean, go up one half size on the Idle jet. I too have a chevy s10 it idles fine when its cold, but as soon as its warmed up and hot the idle jumps to 3,000 RPM. Its not so rough of an idle like its misfiring, so no worries in at the moment. A defective oil pump can also lead to low oil pressure at idle. Any ideas of what to check next?. With normal normal driving it reads 400deg-F and when I come to a stop it will not read below 400 deg-F no matter how long it idles. If any of these is lacking, the engine may stall. Here is a list of things I have done. over the past few weeks i have gone on little test drives, turning the timing up a little as seems ness. Step 2 - The idle air control motor (valve) is responsible for controlling the engine idle speed, if this part fails or becomes weak the engine idle speed could become erratic, additionally, this condition may or may not trigger the MIL (check engine, service engine soon light. Mine idles what i call high but that is probably the way it came and is supposed to act. In a lot of Mazda and Ford’s the fluctuating idle will actually come from a bad O2 sensor or MAF not the IAC. It won't flucuate around, just stay at one level, but that level varies with each time you start it up. This helps the car warm up faster to reduce NOX (nitrous oxide) emissions. My problem is a couple things but I think they are all related with one problem, so when I’m idling with the icp plugged in the truck will surge at idle about 100 to 200 rpms up and down And when I’m driving it feels like it has power but it just sounds really rough and not how a obs 7. Idle Air Control Valve and Throttle Conrtol Switch Open up the hood and look at all the wires, spark plugs, tubes, vacuum lines and valves. Manifold May 08, 2017 · Rough Idle - Chevy 350 TBI Discussion in 'Engine Performance + Maintenance' started by DerekTheGreat, May 8, 2017. If it has not pulled any codes (idiot light). I too have a chevy s10 it idles fine when its cold, but as soon as its warmed up and hot the idle jumps to 3,000 RPM. Hello everyone. You may have to remove the EGR Valve to inspect the internal valve. I think it is the guage but am not sure, do not want to mess the engine up. On startup, i got: P0003 Fuel Volume Regulator Control Circuit Low P0301 Cyl 1 Misfire C0700 P0303 Cyl 3 Misfire. Then I come along and retune it correctly and advance the timing to 22* and idle it down to 1000 RPM, when I moved the idle timing up it also moved the timing up on the other end so now at 2500 RPM your max timing is now 48*look out a melt down is about to occur. The idle air intake ensures your Silverado maintains a consistent idle, even when it powers vehicle functions. This is caused by the throttle plate not seating properly. The truck idles like crap in park, but idles smooth in drive. Cam is a 239/245. loads up and quits. I worked as a mechanic. Rpm's stay up even after the choke is open. After it stalls it starts right back up with no problem but still revs up and down at idle. Clean your throttle body, and change your spark plugs with A/C Delcos #41-103, most other brands will cause rough idle like Autolites and Bosch. Engine Size : 4. when driving the car it runs fine but at idle it revs up and down till it stalls. 5L Chevy turbo diesel, Chevrolet, Cadillac, Buick, and GMC, 20 replies GM to put turbo diesel engines in mid sized pickups starting in 2014, Automotive, 1 replies chevy putting out a diesel cruze, Chevrolet, Cadillac, Buick, and GMC, 125 replies. I as well get this rough idle randomly when coming down into the transition to idle speed control. Finally got my SBC 350 running again from over the winter, Now that i have it running i have some weird problems. Upon start idle is smooth. My problem is a couple things but I think they are all related with one problem, so when I’m idling with the icp plugged in the truck will surge at idle about 100 to 200 rpms up and down And when I’m driving it feels like it has power but it just sounds really rough and not how a obs 7. Average repair cost is $250 at 44,550 miles. I have a 1992 Chevrolet Silverado with a misfire. I determined that with the PCV valve hooked up, my SBC 350 will not idle right, it just fluctautes up and down. 1st time - CEL Flashing, Traction Control Illuminated on Dash, rough idling and clunking when put into reverse (so hard it shook the vehicle). Car shaking while idle I have the same issue. >plugs, cap, rotor, TBI is new last year. when the car is in motion there is no problem even on the hottest day. If you’ve specified less timing below the target idle speed than you have at the idle speed, this often makes for an unstable idle as the ECU pulls timing while the idle speed falls. Adjust both screws in even increments, beginning with two turns out. 2, but smells real rich & stinky exhaust. Drove it around the block and engine died shifting from 2nd to 3rd when I mashed the. Clicking this will make more experts see the question and we will remind you when it gets answered. However, after driving, sometimes the idle speed will go slightly up and then slightly down on me. In Mid-85, GM changed over to a 307 with 7A cylinder heads and a hydraulic roller-lifter drivetrain. There are only 5 normal ways for air to get past the TB: The throttle plate, the base idle speed set screw (BISSS), the ISC, the fast idle air valve (FIAV), and the EGR valve. But there are many other elements under the hood that can cause this problem. If my plugs are fouled and wet and the engine floods out. I initially set the idle in park at 800 rpm, and then it goes down to 600 rpm when put into gear. Clean your Idle Adjustment Control. It also dips below every 3-4 seconds and comes back up to normal idle. Re: Fluctuating idle/Fluctuating voltage 01-03-05 07:19 PM - Post# 590567 In response to backup sounds to me like it could be the all to troublesome positive battery side post, if you guys have the original ac delco battery I would definatly check the positive battery terminal to see if it has any type of corrosion or possible leakage they are notoriuos for leaking or even busting the seal. Going up a hill is a tough issue. 87 C30 454 TBI Rough Idle and almost stalls out if you stand on it. it seems to only idle with any consistency around 1400, and honestly it sounds more like 800 with the cam. I was coming up the mountain on the way to my house faster to than usual, stuffing it in the turns. 7 tbi when at idle it has a low to the idle. I have replaced the TPS , tuned it up , replaced fuel filter, and cleaned out the EGR. Chevy Truck Forum | Silverado Sierra GMC Truck Forums. Ford Style IAC. It is critical to engine efficiency and to the service life of the valve train (camshaft, lifters, pushrods, valve springs, etc) for the lifters to have the proper amount of preload. I have an 89 Cherokee with the 4. It does it a lot when I get up to 40 mph. 350 SBC/5-Speed Swapped: 1959 Aston Martin DB Mark III This 1959 Aston Martin DB Mark III (chassis 30031523) is a late production example, and one of about 550 made starting in 1957. It flacuates between 350 and 1000 rpm. 6L Duramax Diesel 2500 & 3500 series trucks. I know the choke is bad ( or at least pretty sure) because it doesnt do anything. A common problem on these trucks is the. Call (866) 756-3859 for more information about Stock#O71088. My pressures don't get quite that low, even during idle periods during heavy towing. The engine runs fine when cold but as it warms up it starts to "surge" at idle and when you come to a stop it acts like it wants to stall then it grabs. I would prefer a leaner AFR at around 13. A defective oil pump can also lead to low oil pressure at idle. SOURCE: 2002 Chevy Trailblazer idle down cut off when heater or AC is on. As long as the shaft has up and down movement, you may proceed with the rest of the distributor installation: add a distributor gasket install the hold-down clamp connect wiring If there is no up and down movement in the shaft, nylon distributor shims (shown above) need to be added until there is 0. I have a code 507, idle control system, rpm higher than expected code. then sometimes i. If you’ve specified less timing below the target idle speed than you have at the idle speed, this often makes for an unstable idle as the ECU pulls timing while the idle speed falls. But it can also be caused by a vacuum leak. Car shaking while idle I have the same issue. It takes several times to get it to smooth out. Test the readings. Replaced wires, plugs, distributor cap/rotor, tps, ignition module, map, IAC, engine coolant temp sensor, rebuilt fuel pressure regulator and new alternator. Re: Fluctuating idle/Fluctuating voltage 01-03-05 07:19 PM - Post# 590567 In response to backup sounds to me like it could be the all to troublesome positive battery side post, if you guys have the original ac delco battery I would definatly check the positive battery terminal to see if it has any type of corrosion or possible leakage they are notoriuos for leaking or even busting the seal. 00) for standard gasoline. Mine idles what i call high but that is probably the way it came and is supposed to act. Its not so rough of an idle like its misfiring, so no worries in at the moment. 6L Duramax Diesel 2500 & 3500 series trucks. When the AC clutch engages to run the compressor, it places an additional load on the engine. Cost of transmission rebuild for 6. While in park or neutral, my idle is now between 1200 and 1500 rpms and i dont know why. I would prefer a leaner AFR at around 13. 71 chevy with 350 engine, edelbrock intake and 600 cfm carb setup, new HEI distributor put installed, 8mm spark plug wires. The 5A heads seemed to appear for a while after '85 in the VIN 9 engine, but there are 7A headded VIN 9 engines too. If any of these is lacking, the engine may stall. I have replaced the TPS , tuned it up , replaced fuel filter, and cleaned out the EGR. Lazy mechanics simply dial up the idle to mask the problem, rather than fixing it. It came back up again within 1 or 2 days. As long as it acts the same way every day and doesn't interfere with the initial shift into gear, be glad. Started right up but the idle is way too high. 87 C30 454 TBI Rough Idle and almost stalls out if you stand on it. If that fixes it, replace the MAF. > > > I have an '86 GMC 1/2 ton pick-up that now has a 5. Now it is down to one. Search " " across the entire site Search " " in this forum Search " " in this discussion. Some other causes of a rough idle. I am used to having to idle larger cammed engines up a little higher but 1400 seems a little much. You can manipulate the idle speed with the vacuum advance by hooking it up to manifold vacuum which will pull more timing (advance) at an idle, thus causing the idle to go up a couple of hundred RPM. Up and down idle on start up. I always let my 86 warm up since its cold weather. Clamp line from Idle Stabilizer / Auxiliary Air Valve to the intake manifold to see if idle stabilizes. Going up a hill is a tough. Chevy Blazer and GMC Jimmy Questions. it has a 600 cfm edelbrock carb but when i adjust the idle screw down the engine shuts off. The main cause for a high idle speed is to mask instability—either a roughness or swing in engine speed. We use cookies to give you the best possible experience on our website. Spray a soap/water solution or parts cleaner at the "joints" and see if the idle speeds up; if it does, you've found the leak. Actually, you car is equipped with a "high idle" mechanism on the carburetor. when the car is in motion there is no problem even on the hottest day. The fuel pressure must be tested with the engine running. But the car's computer (PCM) should bring the idle speed back up. It idles rough and actls like it's going to stall. You just need to dial the idle back to spec. Operating temperature is stable at 176°. The car is said to have been restored from a rust-free California car, and the seller says that both exterior and cabin cosmetics remain excellent with few signs. Then you have a jetting issue. I have a 1988 Chevy truck 5. You still have too much air getting past the TB, but you have narrowed the number of possibilities down to 4. The best way to set the idle mixture is to lean the carb out until the vacuum just starts to drop, then richen the mixture by about 1/4 turn. Actually, you car is equipped with a "high idle" mechanism on the carburetor. Here is a list of things I have done. I changed the spark plugs and wires, coil, and cap, but it's still missing. 622", 112 LSA using HP Tuners. I tried to pull out vacuum hoses and see if it changes the idle, It does change abit (higher) then I put it back on and then it slightly goes down, but still 3000RPM and you can really smell the fuel. Hello, hows everyone? lol. Combustion engines run at maximum efficency at a certain temperature. My original problem with my 2004 Silverado 5. when driving the car it runs fine but at idle it revs up and down till it stalls. Manifold May 08, 2017 · Rough Idle - Chevy 350 TBI Discussion in 'Engine Performance + Maintenance' started by DerekTheGreat, May 8, 2017. 3-liter was a surge at idle when warmed up. 2%, though its sedans performed, on the whole, substantially worse. With the engine at idle, each rocker stud nut is loosened until it starts to click. 7 starts and runs a while then dies and sometimes will start up and sometimes it wont stgart right back up 8 Answers. However, after driving, sometimes the idle speed will go slightly up and then slightly down on me. If you mixture screw is not out one full turn, something like only 1/2 turn out from seated then your Idle jet is too rich, go down one half size on the idle jet. When i take off it suptters but do does backfire. These include: Head. The Air Conditioning Shouldn't Normally Keep the Idle Speed Down. 00) for standard gasoline. From there, make sure the idle screws aren buggered up. Test the readings. also wont shift (electronic) into 4hi. Once the truck is running down the road, the RPMs smooth out and it runs fine. freon low pressure sensor on the accumulator is faulty. I cleand the throttle body with crc throttle body and intake cleaner. No fancy video stuff here, just one mean sounding American muscle car. Being "heavy chevy," my guess is that you have a chevy something. Mine idles what i call high but that is probably the way it came and is supposed to act. If it has not pulled any codes (idiot light). Does anyone have an. N/A: Vacuum Leak. My problem is a couple things but I think they are all related with one problem, so when I’m idling with the icp plugged in the truck will surge at idle about 100 to 200 rpms up and down And when I’m driving it feels like it has power but it just sounds really rough and not how a obs 7. Updated March 2, 2012 8:32 pm ET General Motors Co. Engine surges Hi, i want you to clean the air intake valve and idle speed control valve, follow the procedure below. Not the case. We use cookies to give you the best possible experience on our website. 350 rough idle & eng. Re: Fluctuating idle/Fluctuating voltage 01-03-05 07:19 PM - Post# 590567 In response to backup sounds to me like it could be the all to troublesome positive battery side post, if you guys have the original ac delco battery I would definatly check the positive battery terminal to see if it has any type of corrosion or possible leakage they are notoriuos for leaking or even busting the seal. When you depress the accelerator, it will. I have >turned up the idle screw in the base plate of the TBI, which does not >seem to help, it just goes back to low idle and stalling again, is the >a way to get that back to the original factory setting? I am presuming >that screws up the main computer. The first place to go when attempting to lower the idle speed is the basic tune-up. 7 just recently it just shut off while I was driving it. In gear it's steady for a short time and then slowly goes up and down and then, goes up and down faster and faster until it starts to surge and then stall. Drove it around the block and engine died shifting from 2nd to 3rd when I mashed the. As long as it acts the same way every day and doesn't interfere with the initial shift into gear, be glad. If you have a bit of a stumble in very light, low speed operation, sometimes it helps to richen it up by another 1/4 turn. It has a Mass Airflow (MAF) sensor and a Manifold Absolute Pressure (MAP) sensor. Low oil pressure at idle only, will most often mean that the engine is low on oil. This helps the car warm up faster to reduce NOX (nitrous oxide) emissions. It came back up again within 1 or 2 days. Chevy Truck Forum | Silverado Sierra GMC Truck Forums. I figured this problem was maybe growing pains, however it's now happened a second time in less then a month. plants that manufacture the Chevrolet Silverado and. 2%, though its sedans performed, on the whole, substantially worse. This is not your '70's oil. Hello everyone. Shop Now!. well when i first start the tahoe it idles at 14. 3 engine are known for making bad throttle control switches (TCS) and Idle air control valves (IAC), which would cause all these problems. SOURCE: 2002 Chevy Trailblazer idle down cut off when heater or AC is on. 2004 chevy trailblazer idles up and down when heater is turned on. Q: What is a rough idle? my car when warming rpms will go up and down sometimes, even at a light after warming it will rev up a bit by itself Fallen41 - 2 Answers my question for members is : what is a rough idle? my car when warming rpms will go up and down sometimes, even at a light after warming it will rev up a bit by itself , please answer. 3 liter vortec v6. I have a 1992 Chevrolet Silverado with a misfire. As American automobiles grew in size and weight following the Second World War, the engines powering them had to keep pace. Its not so rough of an idle like its misfiring, so no worries in at the moment. Now it is down to one. Bad idle air control valve Bad idle air control valve symptoms Idle speed goes up and down or high idle. I worked as a mechanic. Yeah but I. These include: Head. I has so far replaced distributor, cap, rotor, plugs, wires, cts, iac, o2 sensor, map sensor and tps. Chevy Blazer and GMC Jimmy Questions. Only after I'm hauling a load is when I let idle back down to 400 deg. My 94 Chevy 1500 Rpms fluctuate up and down at idle and I am starting to notice it while going down the road. This is not your '70's oil. freon low pressure sensor on the accumulator is faulty. I have a very short Air path to the IAC which is hooked up to the vaccum port on the passenger side of the MAF where you usually hook up the PVC line. Then you have a jetting issue. I took it to dealer and after 4 days later they told me that for this age and mileage it is normal. will idle production of its Chevrolet Volt battery-powered car for five weeks. It flacuates between 350 and 1000 rpm. Setting the idle for the highest vacuum idle reading will result in too little clearance of the throttle plate; forcing too much of the idle mixture through the lower idle port and too little through the idle transfer slot. 1992 Chevy K1500 5. When I went to start the car, it started right up with a high idle which is what I expected to happen being that I haven't adjusted it yet. Started right up but the idle is way too high. Test drive this Used Lightning Blue Metallic 2019 Ford Ranger & experience the Terry Labonte Chevrolet difference today. Test drive this Used Lightning Blue Metallic 2019 Ford Ranger & experience the Terry Labonte Chevrolet difference today. Then I come along and retune it correctly and advance the timing to 22* and idle it down to 1000 RPM, when I moved the idle timing up it also moved the timing up on the other end so now at 2500 RPM your max timing is now 48*look out a melt down is about to occur. When i finally get to a stop sign, I have to hold my foot on the brake and rev the engine way up to keep it from shutting off. If any of these is lacking, the engine may stall. I determined that with the PCV valve hooked up, my SBC 350 will not idle right, it just fluctautes up and down. No fancy video stuff here, just one mean sounding American muscle car. 1992 Chevy K1500 5. Has done this since the day I took it home. I have done some searching within the Forum, however haven't found anything that was. 1st time - CEL Flashing, Traction Control Illuminated on Dash, rough idling and clunking when put into reverse (so hard it shook the vehicle). Hi All, I have 2014 Cruze Equip (auto transmission) Australian model. As more power is applied to the engine via acceleration, the pressure builds up inside the engine. Now it is down to one. Q: What is a rough idle? my car when warming rpms will go up and down sometimes, even at a light after warming it will rev up a bit by itself Fallen41 - 2 Answers my question for members is : what is a rough idle? my car when warming rpms will go up and down sometimes, even at a light after warming it will rev up a bit by itself , please answer. 20 minutes roll by and it is still stuck at this high idle, I adjusted the idle mixture screws and even the screw that controls the carburetors idle speed when it is warm on the 1406 and it did absolutely. i have 2 brand new yellowtop batts with 0 gauge connecting the 2. Idles abnormally high, but tries to die out when idle screw is adjusted. The main culprit for idle instability is uneven fuel distribution in the intake manifold. 10 mins or so. I have a 1987 Chevy Silverado, 350 or 5. IAC 2% base, but cycles up & down. I was coming up the mountain on the way to my house faster to than usual, stuffing it in the turns. The old one was just 2 years old. Sure enough, it was almost a quart and a half low on ATF. I am used to having to idle larger cammed engines up a little higher but 1400 seems a little much. As long as it acts the same way every day and doesn't interfere with the initial shift into gear, be glad. When I let off the gas, it barely slows down. Rpm's stay up even after the choke is open. Sometimes the problem is caused by a gummed up or sticking idle air control valve (IAC) or. 5L Chevy turbo diesel, Chevrolet, Cadillac, Buick, and GMC, 20 replies GM to put turbo diesel engines in mid sized pickups starting in 2014, Automotive, 1 replies chevy putting out a diesel cruze, Chevrolet, Cadillac, Buick, and GMC, 125 replies. Start it up and let it sit about 10 minutes at idle so it can relearn idle. There are only 5 normal ways for air to get past the TB: The throttle plate, the base idle speed set screw (BISSS), the ISC, the fast idle air valve (FIAV), and the EGR valve. While we were filming down at Manns Restoration the other day, Jordan heard this car fire up in the background. Test the readings. Mine idles what i call high but that is probably the way it came and is supposed to act. (Ride to the bus stop) It seems to idle up then i have to give the pedal that pump to idle down. First off when i got the car running i had the timing light ready so i could check / set the timing to around 10-16 deg BTDC. SES light is off. It ran perfectly.