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My Chevy S10 2.8 idles fast in cold weather. What can I do?

Chevy S10 is idling fast in colder weather. What could be the problem?

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Sounds like the fast idle screw needs to be adjusted on the throttle body or if it has an IAC, it may need to be replaced. A little more info on the vehicle might help to narrow it down.

Posted on Dec 12, 2012

  • 10 more comments 
  • veldabooth
    veldabooth Dec 12, 2012

    adjusted the throttle screw. didn't help. where can I find the IAC?

  • Bryan Webster Dec 12, 2012

    Should be located on one side of the throttle body. What year S10?

  • veldabooth
    veldabooth Dec 12, 2012

    it's a 1991

  • veldabooth
    veldabooth Dec 12, 2012

    I have some post on here that have similar problems. They mention a temp. sensor. Where would that be located?

  • veldabooth
    veldabooth Dec 12, 2012

    sorry that should be...I have read some post on here.

  • Bryan Webster Dec 12, 2012

    Is it a TBI injection or a Multi port injection?

  • Bryan Webster Dec 12, 2012

    That is a remote possibility. Does the it heat up fine or is the heat slow to warm up?

  • veldabooth
    veldabooth Dec 12, 2012

    He gets heat WAY before the temp gauge moves. Like the temp gauge is slow?? Not sure about the TBI or multi port injection?

  • Bryan Webster Dec 13, 2012

    Does it have one fuel injector or each cylinder or does it just have two that sits under the air intake hose in front o the throttle butterfly?

  • veldabooth
    veldabooth Dec 14, 2012

    It is a TBI.

  • veldabooth
    veldabooth Dec 15, 2012

    Any help would be greatly appreciated. Again it is a 91 Chevy S10. It is idling fast in colder weather. We have checked the idling screw. It is a TBI. HELP!!!!!!!!

  • Bryan Webster Dec 15, 2012

    Ok, if I am remembering correctly, the Idle Air Control should be on the passenger side of the throttle body. You should be able to get to it fairly easy. Need to take it off and see if there is a lot of carbon buildup on the pintle and down in the chamber below it. Also look in the area that it bolts to on the throttle body. It may be full of carbon as well. I these areas are clear, the problem could be a bad temp sensor. It should be located near the thermostat housing at the front of the engine. Most often the cause is the Idle Air Control.



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Posted on Jan 02, 2017

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SOURCE: 2000 SL-1 fast idle problem during cold weather only

You need to check and/or replace the thermostat and/or the temp. sensor. Take a meat thermometer and stick it in the overflow tank. The temp gauge on the dash should register above the 1/4 mark after at least 15 minutes of driving. If so, the meat thermometer should read above 180 degrees. If the meat thermometer reads 180 but the gauge isn't above 1/4, then you need to replace the sensor. If the meat thermometer doesn't read 180 or higher, then you need to replace the thermostat. The thermostat in these cars, though it doesn't fail on its own, has an unnecessary rubber gasket that fails, and allows coolant to leak past even when shut, causing the engine to not warm up thoroughly. IF the engine doesn't warm up, the idle won't come down--speaking from personal experience. I had to replace both items on my car. Now it idles fine, and after a bit of driving the gauge registers between 1/4 and 1/2, but always above 1/4. DO NOT tamper with idle adjustments unless you have exhausted all other possibilities. They are factory set, critical, and almost never need readjusting. Good luck.

Posted on Dec 10, 2008

  • 32 Answers

SOURCE: 98 Chevy 5.0 fast idle

try cleaning the throttle plate with the right cleaner . from a auto parts store.

Posted on Mar 02, 2009

  • 38 Answers

SOURCE: 1998 BMW Z3 2.8 Idles rough when cold starting in wet weather

the problem could be in air mass flow sensor, but it's expensive

Posted on Jul 07, 2009

  • 1619 Answers

SOURCE: cold start/fast idle problem 190e petrol

Try online for a used unit or or to get parts.

Posted on Jul 21, 2009

  • 2050 Answers

SOURCE: My 89 Toyota pickup idles too fast in cold weather

I would have a look at your coolant sensor, if it's reading the wrong temperature, it will cause a idle problem. If you can, get a scanner on it to verify it's operation.

Posted on Sep 24, 2009

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