ideal idle speed (rpm)

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  #1  
Old 11-30-04, 01:52 PM
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Question ideal idle speed (rpm)

what is the best idle rpm for a 2002 chevy s10 pickup with 4-cyl, 5-spd? my truck now idles at 1100 rpm; this seems excessive to my ear. i did some web searches but never found anything specific. is optimum idle speed set/specified for every vehicle, or is it owner preference? thx in advance for your attention.
 
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Old 11-30-04, 02:37 PM
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The idle on that vehicle is computer controlled and NOT adjustable. You may have a vacuum leak or other problem.
 
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Old 12-01-04, 05:43 AM
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I believe its also engine-temperature controlled. My car idles about 1100 at cold start. By the time I shut it off its around 700.
 
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Old 12-01-04, 03:02 PM
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Originally Posted by kuhurdler
I believe its also engine-temperature controlled. My car idles about 1100 at cold start. By the time I shut it off its around 700.
The computer uses all the inputs from all of it's sensors to determine the idle speed. If it's higher than normal, it could be getting inaccurate temp readings among other things.
 
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Old 12-02-04, 08:50 AM
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I had a similar problem on my '88 Ranger 2.9l engine..and it turned out to be a minor air leak in the plenum (sp.) gasket. A inor repair/replacement but helped alot. On my '88, the idle is high for quite some time until the engine finally (after quite a while) reaches its 'running' temp.
Id check for that air leak, also may want to clean the TB (throttle body)..as that may have accumulated alot of carbon and crap!
Just my opinion from some experience on my 2.9l Ranger.
Good luck!
 
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