03 CTS Rough Idle
#1
03 CTS Rough Idle
Hello my wifes 03 CTS idles really rough when in park or stopped at a light.It gets worse when you put the air on,the other day it stalled for the first time when she was taking off from a stop light.What do you think it could be?I was thinking of starting with replacing the fuel filter,the car has 56,000 I am not sure if it has ever been changed.Well, I hope someone can help me out where the problem is.Thanks
#9
RE: 03 CTS Rough Idle
Well that sounds like a very simular problem I had in my 04 CTS. But I had a check Engien light on, and the car would idle really bad in park, and also the AC effected it really bad. Well I did everything I could think of from air filter to spark plugs to fuel injector, fuel filter ect. finally I came to the conclusion that I had an electrical problem going on, But I am not familar with electonics in vehicles. So I had no other choice but to take it the the dealer. Then found the problem, They said I was haveing a problem in the ECM "Engine Control Module" they replaced it, and a wireing harness, and all is good now. Oh by the way, the Codes that came up lead to the issue of multiple cylinders missfireing, and 2 injectors not working properly, and it was all to do with a bad ECM.
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