Question about 1987 Ford Bronco

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Will not idle when first started, and idles high once warmed up

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Idles way to high when warmed up

Posted on Sep 23, 2008

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Why does my2004 gmc envoy xl slt idle high at startup?


This is normal. All vehicles idle high at start up to get the engine to operating temperature. This is known as open loop. The computer ignores signals from O2 sensors to keep your engine running safely. Once it has warmed up, it will enter closed loop, and you will see a decrease in idle.

Jul 05, 2014 | 2004 GMC Envoy XL

1 Answer

High low idle, rough idle stalling


If it's surging, make sure your radiator is full. Do a tune up, plugs, wires, etc. Put some fuel injector cleaner in your fuel tank. On a cold start the vehicle compensates for being cold by adding fuel. Once it warms up the computer tells it to quit adding extra fuel. If it is a bad sensor of sorts, check engine light should come on.

Dec 11, 2013 | 1987 Ford Tempo

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Idle is high at start - 1800 rpm. Seems like excessive white smoke from exhaust. Put into reverse and back out of driveway it has a regular shudder (bump bump bump) but not hard metal grinding sound.....


white smoke out of the exhaust would be a sign that it is burning coolant... if it goes away after it warms up, it could just be condensation inside the exhaust pipe. 1800 rpm is a very high idle, maybe have your IAC motor on the throttle body checked... check engine light? if so have the code read at your local auto zone.

Aug 09, 2011 | 1998 Toyota 4Runner

1 Answer

96 RS Camaro High Idle on Cold Start.


you prob need a coolant temp sensor

Oct 30, 2009 | 1996 Chevrolet Camaro

3 Answers

High idle at first start


quite normal as the vehicle has a auto matic choke,
once the engine starts warm up so the idle rate comes down "youdoit"

Oct 26, 2009 | 2006 Toyota Tacoma

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Engine will start at very low idle, sometimes killing, then may fast idle, then low idle, back and forth. What may cause this?


check and make sure air filter is ok, and there are no restrictions in hose to throttle body, check iac (idle air control.

Oct 01, 2009 | 1990 Chevrolet Corsica

1 Answer

1991 dodge colt won't idle when engine is cold.


probably oil, it may be too thick when it's cold but once it warms up it liquefies and your engine runs smoothly. you could try changing oil, I'm guessing if you have a high performance oil the chances this is the problem may be greater since high performance things are usually geared towards working well when everything is hot

Jun 29, 2008 | 1991 Plymouth Colt

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