Quote:Originally Posted by
Funkapotimus Quote:Originally Posted by GertFrobe
So while I’m thinking about it, I meant to ask before if you are running the air conditioner or defroster when this behavior is heard. If you have either of those on while listening to it idling up and down, turn them off and see if that stops the erratic behavior.
The engine will idle up a little when the air conditioner compressor kicks on, and it will idle back down when the compressor kicks off. So if the compressor is cycling on and off more than it usually would, you could perceive that as a problem with it idling when it’s actually behaving the way it is supposed to (but the reason for the fast cycling of the compressor would still need to found eventually).
Yeh I made sure everything was turned off completely in the car while the odd idling happens, no heat, no a/c, not even the fan running, just the engine.
Well it was worth a try. The problem is likely a vacuum leak somewhere in the upper part of the engine. My 3.5L did the same thing, and I can’t remover if I fixed it by reinstalling the factory intake setup or siliconing the EGR tube. One or the other (EGR tube and aftermarket CAI) was always leaking, so both could have fixed it.
Ultimately you could just choose to live with it. That’s not the best option since there could be dust getting into the engine if unfiltered air is being burned, and dust in the combustion chambers means there will be dust in the oil, and that can lead to premature wear on the engine’s internal surfaces being lubricated by that oil.
Will that cause the engine to die before it would normally? Probably not, but it could lead to a gradual loss of compression over the years. But then again, how long do you reaslistically expect to keep the car.