2005 Cadillac Deville engine idle

2005 CADILLAC DEVILLE
41,502 MILES • V8 • FWD • AUTOMATIC
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RAUL8
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  • 2 POSTS
hello, I've been having this problem with my car for the last 2 weeks. It seems that whenever I am at a red light, and the car is idling, the engine seems to have a rough idle, and at times it seems like the car is running with 7 cylinders instead of 8. However this does not happen all the time.


[img:aee37fcad6]http://www.2carpros.com/forum/automotive_pictures/460851_cadillac_deville_46_V8_1.jpg[/img:aee37fcad6]
Jan 9, 2010 at 8:42 AM
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FACTORYJACK
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 4,159 POSTS
When it does happen, is there any engine light on/flashing?
Jan 10, 2010 at 11:42 PM
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RAUL8
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NO ENGINE LIGHT OR FLASHING.
Jan 11, 2010 at 4:36 PM
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FACTORYJACK
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 4,159 POSTS
If you had a misfire, especially where you felt that one cylinder was missing, you would have a light. The only thing I can offer, is someone driving it with a scan tool and checking misfire counts, or fuel trim values, to confirm that there is something going on.
Jan 12, 2010 at 2:06 AM
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JONNYT991
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I have the same problem. I replaced a coil pack on the #6 cylinder and it fixed the problem. About 30,000 miles later I had the same problem, with one exception I had no engine lite and no codes. I replace all the coils(very expensive) and went fine for 2 months and then the problem came back. I am thinking it is the computer. But it is another very expensive item. I am still trying to decide what to do. Any news on your car?
Feb 23, 2012 at 9:46 PM