Question about 1988 GMC C1500

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I have a 1989 GMC Sierra that when the motor is cold it idles up and then will idle down and almost die but not quite and then rev back up. Once it is warmed up it idles fine. I just got it and haven't had a chance to to get it on a portable tach to check if it is idling at proper speed when warmed up any help would be appreciated. God Bless

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My gmc did this also and it was the intake gasket

Posted on Apr 08, 2011

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2 Answers

I have a 1989 Mazda 323, when cold engine idles very high, when very cold it idles so high that rev limiter kicks in, and it revs up, limiter kicks in, revs up limiter kicks in, once it warms up idle drops...


Have it looked at by a dealer,iam not sure here but i think you have a vacumn leak like the feed pipe to the servo split but really you need a mechanic who works on these cars day in day out and they will go straight too the problem for you

Jan 18, 2015 | 1989 Mazda 323

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I WAS DRIVING DOWN THE STREET AND HEARD A LOUD POP FROM UNDER MY 1989 GMC SIERRA , THEN IT DIED ON ME ... WHAT HAPPENED


Did you open the hood? It could be a popped serpentine belt or a broken timing chain or timing belt.

Nov 12, 2014 | 1989 GMC Sierra

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1989 mercedes 560 sel, gas, w126/ Car cold starts every morning and idles for 10 min. then stalls


the idle control motor probly worn-on the throttlbody--also the tps sensor - get intake area inspectd--a haynes manual will xplain complete car-partstore hazit--------starter fluid is used for low compression or weak spark

Dec 25, 2013 | Cars & Trucks

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I have 1999Chevy suburban with 6.5 turbo diesel motor.it idles up and down and when driving the gas pedal is real touchy Wat is the problem and were do i locate the problem


Check the help links related to this problem.Click the link below to go through its troubleshooting procedure :-----Idles rough and quits when gas pedal is pressed less? http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html---------
Car won't start without hitting the gas pedal? http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-without-hitting-gas.html
-------Complete loss of brake pedal then all gets normal? http://repairhelpcenter.blogspot.com/2012/01/complete-loss-of-brake-pedal-then-all.html
------Car dies when gas pedal is pressed? http://schematicsdiagram.blogspot.com/2011/12/car-dies-when-gas-pedal-is-pressed.html
--------Pushing on the gas pedal, but the car slows down? Gas pedal to the floor and the car slows down?

http://technoanswers.blogspot.in/2012/02/pushing-on-gas-pedal-but-car-slows-down.html

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After replacing brake rotors and pads, brake pedal remains on floor? http://technoanswers.blogspot.in/2012/02/after-replacing-brake-rotors-and-pads.html

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accelerator pedal sensor? http://technoanswers.blogspot.in/2012/02/2009-chevy-impala-accelerator-pedal.html

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For rough idle issues and problem troubleshooting,go through the help links provided below :----- van idles rough?

http://howtobyme.blogspot.in/2012/01/2004-ford-freestar-van-idles-rough.html

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will not idle when cold?

http://technoanswers.blogspot.in/2012/02/ford-explorer-40-will-not-idle-when.html

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runs lean and idles rough?

http://technoanswers.blogspot.in/2012/02/ford-runs-lean-and-idles-rough.html

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Engine stumbles coming off idle when warm?

http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html

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Erratic idle on car?

http://schematicsdiagram.blogspot.com/2011/12/erratic-idle-on-car.html

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Low idle when cold out side?

http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html

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Idle Air Control (IAC) Valve Replacing?

http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html

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Engine quits at idle?

http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html

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Car overheats and Air blows hot at idle?

http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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This will help.

Thanks.

Mar 01, 2012 | 1999 GMC Suburban

1 Answer

When i drive down the road and push the clutch in to shift gears my truck revs up and stays there till i have shifted gears and let the clutch back out


i would clean the idle control motor it may be sticking use a good carb spray like Berrymans B 12. clead the velve and the bore it came out of


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Apr 04, 2011 | 1996 GMC Sierra

2 Answers

I have a high idle and the computer hasnt thrown a code. How do I fix this or what all could it be? I also hhave a sunpro tach and dont know what to hook it up to....?


if u own a 1989 sierra u dont have an obd or obd ll computer on board if high idle all time then search for a possible vacuum leak and or throttle/carb needs adjustment

May 24, 2010 | 1989 GMC Sierra

1 Answer

When my 2001 GMC Sierra pickup is idling, I press the gas pedal down all the way and the RPMs only go up to 3000. When I'm driving, it works fine. Any explanation for this?


This is a safety feature for the motor. It is called a rev limiter. This is meant to prevent the motor from reving at high rpms when at idle. This is completely normal

Mar 01, 2010 | 2001 GMC Sierra 1500HD

1 Answer

1991 GMC Sierra revs high and bogs out when


idle my be offset or a hose my be off as well

Oct 14, 2009 | 1991 GMC Sierra

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