Question about 1993 GMC Yukon

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Im wondering if the IAC would make my idle flucuate after its warm and it only jumps down 200 rpms and then back to normal. ??? weird??????

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Hi Dirtcrazy, Depending on which type of climate control is fitted to your vehicle, (if it is automatic or manually controlled) it will have either one or two 'up idle' solenoids. These are electrically operated vacuum controls which are sometimes adjustable and sometimes preset. They or it will be fitted in different places on different vehicle. It is difficult to know where on your vehicle as we do not know which vehicle it is? locate the 'up idle' solenoid and make sure that the vacuum tube connections are not cracked, broken or loose. The defects noted would result in the fluctuating idle speed you're referring to. Regards John.

Posted on Feb 10, 2012

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2007 ford sport trac 4.0 v6 rough idle was told this truck has no IAC? New plugs wires cleaned throttle body been smoke tested no vacumm leaks rpms jump when cold level off once warm no hesitation


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I have a 2000 Nissan Sentra GXE. The engine has a judder on acceleration. Most noticeable between 2 and 3k rpms. It does it on hard throttle at speed also.I have no check engine light on and have replaced...


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When i start it it starts fine but if it is cold it will not idle i have to keep pushing gas pedal


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