Weird idle??

BlkSCnKS

Registered User
Ever since I got my exhaust done I have noticed that when sitting at an idle, every thirty seconds or so the idle seems to go up based on the sound of the exhaust. The tach will not move but the boost gauge will start moving toward boost then go back down. I am assuming I did not notice it before because I could not hear the exhaust. Is this normal? Thanks, Brandon
 
Is your A/C compressor maybe cycling? If your defroster is turned on the A/C compressor is set to cycle every once and a while to help keep it in shape during winters.

That would cause the idle to change slightly to compensate for the increased load of the compressor.
 
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