Question about 1991 GMC C1500

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Why does my gmc sierra run at a high rpm - 1991 GMC C1500

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Could be a temperature sensor, Idle air control issue, or even a power steering switch. A scanner will tell you the problem.

Posted on Apr 26, 2010

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Posted on Jan 02, 2017

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While driving my 2012 GMC Denali 6.2l Ive noticed in the last 2 weeks that my RPM's are running high. Initially I noticed increased cab noise and vibrations. Tire pressure was checked initially and r


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The overheating could be alot of things. Could be the fan or thermostat or leaking water and on and on. If the tow does not disengage the truck will run in a lower gear causing more gas use.... Hope this helps but just a guess without looking at it.... Good luck

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Faulty fuel pump.Check your fuel pressure it should be 9-13 psi with engine running.

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After getting my 95 GMC Sierra 1500 5.7L V-8 back from a failed emissions test I let their mechanic fix it( or pass smog) However, now when the truck is in park the rpm's are at 1200 about 300...


I had an 89 Chevy Silverado with a high idle problem, A lot of money later and a lawsuit against a repair shop that said they fixed it and they didn't caused early engine failure and they wind up paying for a new engine. Long story short, I found out the main cause was I had to replace the throttle body gasket because it was bad causing more air intake and the on board computer tried to compensate for the air by adding more fuel therefore, high idle. I hope this helped.

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My 2000 gmc sierra z-71 has started idleling at about 1300 rpm after driving for a while. when i turn it off and restarted it would idle fine for a while then start idleing high again. it is getting to...


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Jul 02, 2017 | 2000 GMC Sierra

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The throttle is running at a high rpm about 1000 and throttle cable has some slack in it usually idles at about 700 rpm can it be adjusted or do i need a new cable its a 1998 gmc sierra 1500 5.7 litre


The throttle cable is probably ok. I would be more likely to suspect the idle air control valve/solenoid to be causing your trouble. Sometimes trouble with the EGR valve not closing all the way will cause this problem as well.

Feb 25, 2010 | 1998 GMC Sierra

1 Answer

1998 GMC SILVERADO FIXED AND REPLACED EVERYTHING ,HIGH IDLE


have you replaced your intake gaskets? this is a problem on these trucks with high milage. to see if your intake is leaking spray it down with Brake cleaner and if it is leakin you will hear a drop in Rpm's
hope this helps
please rate me
Thank you
Aaron

May 08, 2009 | 1998 GMC Sierra

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