2005 Cadillac Deville engine idle

RAUL8

MEMBER
2005 CADILLAC DEVILLE
V8
FWD
AUTOMATIC
41,502 MILES

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.

Saturday, January 9th, 2010 AT 8:42 AM

4 Replies

FACTORYJACK

MECHANIC
4,159 POSTS

When it does happen, is there any engine light on/flashing?

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Sunday, January 10th, 2010 AT 11:42 PM

RAUL8

MEMBER
2 POSTS

NO ENGINE LIGHT OR FLASHING.

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Monday, January 11th, 2010 AT 4:36 PM

FACTORYJACK

MECHANIC
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.

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Tuesday, January 12th, 2010 AT 2:06 AM

JONNYT991

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1 POST

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?

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Thursday, February 23rd, 2012 AT 9:46 PM