Cadillac CTS The mid-sized sedan that has grown the popularity of the Cadillac brand with it's low price and sleek styling

03 CTS Rough Idle

  #1  
Old 10-07-2007, 08:58 PM
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Default 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
 
  #2  
Old 10-08-2007, 09:00 PM
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Default RE: 03 CTS Rough Idle

Have you checked the air filter to see if it is clean? If you are not getting enough air it will cause these symptoms as well.
 
  #3  
Old 10-08-2007, 09:20 PM
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Default RE: 03 CTS Rough Idle

SES light on, if is running as bad as you decribe it should be.Have car checked for codes,and re-post along with any mod's
 
  #4  
Old 10-09-2007, 07:02 AM
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Default RE: 03 CTS Rough Idle

Hello air filter is brand new and there are no lights on SES etc.Thanks
 
  #5  
Old 10-09-2007, 07:42 PM
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Default RE: 03 CTS Rough Idle

Codes can be stored with turning on ses light.Was anything done shortly before condition or did occur out of the blue?
 
  #6  
Old 01-05-2008, 07:19 PM
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Default RE: 03 CTS Rough Idle

I had the dealership upgrade my software to raise the rpm about 50 rpm. This is a known problem and was covered under my warranty.
 
  #7  
Old 01-12-2008, 08:03 AM
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Default RE: 03 CTS Rough Idle

hey, does it hesatate when you acclerate because it can be that you have build up on the injecters have you tried fuel injecter cleaner?
 
  #8  
Old 02-18-2008, 09:54 PM
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Default RE: 03 CTS Rough Idle

Try a can of Techron injector cleaner, (Pep Boys) ortry a tank of Chevron high test gas.

I use Chevron gas or shell in all my GM cars & Trucks adn Techron every 2 months.
 
  #9  
Old 03-10-2008, 01:13 PM
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Default 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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