Guys hopefully you can help me. I have a 2001 Cavalier 2.4L. I recently had the water pump replaced due to it leaking and now after I picked it up from the repair shop it idles worth a darn. I never had this problem before. Idles very rough almost like it is running on 3 cylinders. When I drive it down the road it seems fine. I have checked for vacuum leaks and found nothing. I even sprayed the area with carb cleaner while running to try to detect the hidden vacuum leaks and still nothing. I changed the plugs which seemed to help a little but not fix the problem. I dont think my car is equipped with a EGR valve? Everything I read points to this but I am thinking my car doesnt have one? I checked the IAC motor and it moves in/out when the key is turned.
I have no codes on. I also cleaned the throttle body which was dirty still rough idle and hesitation once I start moving. I did unplug the mass air flow sensor when it was running thinking it might get worse and it didnt. I am thinking about replacing that for $12.
I am at my wits end with this thing. HELP.
have the same problem?
Sunday, March 29th, 2009 AT 7:19 PM