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2002 Chevy Trailblazer Running rough at idle

Tiny
FREDDYT
  • MEMBER
  • 2002 CHEVROLET TRAILBLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 86,000 MILES
The SES light came on and the diagnostic code said that the #3 cylinder was mis-firing. I replaced all 6 spark plugs, and now the car is running VERY rough at idle and sluggish acceleration. Why?
Monday, July 6th, 2009 AT 1:06 PM

3 Replies

Tiny
BRIAN 1
  • MECHANIC
  • 1,030 POSTS
If you raise the idle a little does the missfire go away? And is it the same cylinder? And did you switch coils to see if the missfire changes to another cylinder? Post back with what you find.
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Monday, July 6th, 2009 AT 1:31 PM
Tiny
FREDDYT
  • MEMBER
  • 2 POSTS
Thank-you very much for you time to reply to my posting. Your response to my question was "somewhat" helpful. What I ending up doing was to take all of the coils off, cleaned each connection, then put on some conductive grease. This worked perfectly.
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Tuesday, July 7th, 2009 AT 12:14 PM
Tiny
BRIAN 1
  • MECHANIC
  • 1,030 POSTS
The reason I asked is because these vehicles have alot of cylinderhead problems, so I asked to lead you in the wright direction. Atleast its fixed.
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Tuesday, July 7th, 2009 AT 2:02 PM

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