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2004 Chevrolet Colorado 3.5L Misfire
Posted to GM Driveability on 2/28/2011 21 Replies

This vechile misses on #3 at idle only. tried a new coil and plugs no difference so we did the exhaust valve springs and seals per TSB. No difference, still misses on #3. I have since heard rumours of bad heads. Any ideas.

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  Related Documents & Media  2004 Chevrolet Colorado

 
Message Closed w/Summary

car Vehicle Data

2004 Chevrolet Colorado

VIN 1GCDT136X4
Engine3.5 L / 5 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsMisfire
OccursIdle

Trouble Codes

P0300Multiple Misfire Detected
Message Closed w/Summary

car Vehicle Data

2004 Chevrolet Colorado

VIN 1GCDT136X4
Engine3.5 L / 5 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsMisfire
OccursIdle

Trouble Codes

P0300Multiple Misfire Detected