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2004 Chevy Colorado Misfire Code

Tiny
WSHBNE
  • MEMBER
  • 2004 CHEVROLET COLORADO
  • 6 CYL
  • 2WD
  • MANUAL
  • 51,600 MILES
The check engine light on my 04 Colorado recently came on and I had my service station run a diagnostic test and it came back with a misfire code. They didn't attempt a repair because there was a service bulletin from GM about the problem. It also said the exhaust valve springs and seals could be bad. I took it to a GM dealer and they ran a diagnostic to be sure and they came up with the same code. They recommended an injector and throttle body cleaning. They did their recommendations and they said after a test drive the same thing happened. Any thoughts?
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Tuesday, February 16th, 2010 AT 3:07 PM

1 Reply

Tiny
DENNYP
  • MECHANIC
  • 1,823 POSTS
Inspect the plug, coil, and boot on the problem cylinder. Do a cylinder leakdown test and a running compression test on all cylinders. This will show any leakage past the valves.
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Tuesday, February 16th, 2010 AT 11:28 PM

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