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Old January 10th, 2018, 21:13
trippled trippled is offline
NAXJA Member
Join Date: Apr 2006
Location: colorado springs, co
Posts: 1,727
Re: Idle drops when HVAC controls are adjusted

An easy check would be to just plug off all the vacuum lines running to the cruise and HVAC stuff at the intake and retest. If it's still there then you know it's not vacuum related.

Depending on the size of the vacuum leak,the computer can see a change in map (less vacuum) and interpret that as load, which would cause the pcm to add fuel. Which could actually drop the idle.
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