Question about 1991 Chevrolet C1500

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How do i adjust the idle on my 91 chevy c1500?Runs high even when warmed up.

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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GregV24CHOPP
  • 11 Answers

SOURCE: when cold, it idles rough, revs high then low! After warmed up it runs fine

if it runs high when you first start it then mellows out,, theirs no problem , all of our chevys do that.... but if its sputtering or you hear a quiet popping noise check spark plugs

Posted on May 20, 2009

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  • 1114 Answers

SOURCE: I can spray startr fluid and it runs. But idle

If the engine has Throttle body Injection TBI, I believe there is an idle speed module on the side of the throttle body which may be bad. Try unplugging the module and see if the idle changes.

Posted on Jul 23, 2009

bunnydawg
  • 5158 Answers

SOURCE: Fuel pump constantly runs

sounds like you haven't got the right relay or the replacement has failed. pull one relay at a time and go back to the rear of the vehicle and listen for the pump. make sure the key is on when you do the test.

Posted on Sep 09, 2009

  • 1 Answer

SOURCE: idle out of control.

check all your vacuum hoses and the throttle body itself for a vacuum leaks if the hoses replace as nessasary if to check for throttle body get can of carb cleaner and spray around base of throttle body and sides not in it if idle raises you have a vacuum leak goto a good parts store and ask for a rebuild kit don't goto auto zone or advance they don't carry them

Posted on Oct 18, 2009

  • 400 Answers

SOURCE: 1996 chevy C1500 350 motor idle high and as a

Sounds like an Intake gasket has sucked in to me.

Posted on Nov 22, 2009

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Replacing oil pan gasget on my 91 chevy C1500 5.7 auto. Do I have to lift engine? Do I have to remove tranny shield. Already putting new starter on it.


Not sure here i but i think replacing the whole vehicle with a newer small engined diesel to reduce your carbon footprint might possibly be a better option,the price of fuel will only keep going up and come on a 5.7 litre engine is becoming obnoxious and even more so as because its so old its not engineered to modern emmision standards ,

iam jealous sorry

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1 Answer

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You can either try cleaning the idle air control valve or you can replace it.Afterwards you will need to reset the computer by disconnecting the ground cable on the battery for 30 seconds.

Jan 31, 2012 | 1991 Chevrolet Lumina

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1996 Chevy c1500 low oil pressure when hot at idle


Pressure regulator in the oil pump is bad or there is significant main bearing wear

Oct 09, 2011 | 1996 Chevrolet C1500

1 Answer

Ran my 1997 chevy lumina ls through flooded water...still runs but idles real high without even touching the accelerater and the temp runs high and have to shut it off let cool down before starting...


If your electrical wires got wet, it could cause all kinds of problems. You could have a bad idle control sensor or the idle may need adjusted. The electrical wires probably need time to dry out, if it hasn't been long ago. A bad map sensor can make the car idle high. Do you have a check engine light on now? If so, you need to get it scanned at Autozone for codes. Does the car die?

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91 CHEVY LUMINA IS IDLING VERY HIGH,AND CAT IS TURNING ORANGE,THATS HOW HOT IT GETS


Check for a stuck open EGR valve,it will have to be removed to be checked.Or you have a large vacuum leak,either one will increase idle and fuel causing hot cat and high idle.

Apr 17, 2010 | 1991 Chevrolet Lumina

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Feb 25, 2010 | 1991 Chevrolet C1500

1 Answer

What causes 350 on a chevy c1500 1996 to start


Sounds like a poor idle. try adjusting the idle screw.

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