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  #1  
Old 07-02-2002, 11:55 AM
awfrance
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Querky AC / idle question!

When idling with the air conditioning off, the idle is rough, and sometimes seems as if its missing here and there, turn on the A/C, and the idle is smooth with no missing! I've looked through the threads but can only find things with the idle getting rough and even stalling when the a/c is turned on. Any help would be appreciated!
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  #2  
Old 07-02-2002, 12:36 PM
I told you so!
 
Join Date: Jun 2002
Location: Motor City, MI
Posts: 2,791
When was the throttle body last cleaned? Idle is maintained by controlling air flow on the intake. With the a/c on, more air is introduced by the idle air control motor. With a/c off, more of the idle control is dependant on the throttle body, which builds up deposits over time at the butterfly valve. These deposits ruin the idle on an otherwise good-running engine. A good cleaning with solvent and a toothbrush can perk up the idle.
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  #3  
Old 07-02-2002, 01:32 PM
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Join Date: Jun 2002
Location: Motor City, MI
Posts: 2,791
You didn't mention which vehicle you have or how old it is. Try looking for vacuum leaks in addition to cleaning the throttle body.
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  #4  
Old 07-02-2002, 02:15 PM
awfrance
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Good question.

I've had the car for two years, and i haven't had it cleaned, i have all the service papers from the owner before me, and i dont see any cleaning on those, i'll give it a try, thanks!
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  #5  
Old 07-02-2002, 03:17 PM
awfrance
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Hi Kestas,

Sorry! 1985 500 SEC. Thanks!
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