Question about 1993 GMC Yukon
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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Posted on Jan 02, 2017
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