Engine idle
Thread Starter
Senior Member
Joined: Jun 2012
Posts: 1,541
Likes: 49
From: Gretna, la
Engine idle
When I have the radio on and the AC on low my truck will idle high then go back down. It'll idle high for about 30 seconds then back down for about 3 minute. Anyone know what's causing this ?
Senior Member
Joined: Nov 2013
Posts: 520
Likes: 80
From: Berkshire, NY
It's more the 'AC on' causing this and it is a normal behavior. The PCM is increasing the rev's to compensate for the power consumption of the compressor. Also, if you go WOT the PCM will kick out the AC to give you a little extra punch.