For a few weeks now I've been fighting with an issue with my engine speed surging at idle, and think I've finally solved it. Last night I was trying to get to the bottom of a strange noise under my hood and narrowed it down to the AC compressor. I turned the AC on to see if the noise went away, and it disappeared immediately as soon as the clutch kicked in. Much to my surprise the surging idle disappeared too and the engine ran smooth as silk. I plan on running a ZZP alternator delete pulley until I get a replacement compressor. Anyhow, can anyone explain why my engine surge straightens out when the AC is on?
Crap! If the engine speed automatically increases while the compressor is on, then that would explain it. Though the compressor does need to be replaced, it looks like it may not be the cause of the surging issue.