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2003 Hummer H2 6.0L Poor Idle Quality, Misfire, MIL Lamp on
Posted to GM Driveability on 3/29/2006 6 Replies

car returned to shop again running poorly p0300 again tested left back pressure and found +4 psi figured this cat had alos failed replaced left cat still ran poorly checked right back pressure and found +10psi why are the cats going bad fuel trims are around +...

6 Replies Received (View Replies)

  Related Documents & Media  2003 Hummer H2

 
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car Vehicle Data

2003 Hummer H2

VIN 5GRGN23U93
Engine6.0 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / sefi
EmissionsOBD-II Compliant
SymptomsPoor Idle Quality, Misfire, MIL Lamp On
OccursAlways

Trouble Codes

P0300Multiple Misfire Detected
Message Closed

car Vehicle Data

2003 Hummer H2

VIN 5GRGN23U93
Engine6.0 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / sefi
EmissionsOBD-II Compliant
SymptomsPoor Idle Quality, Misfire, MIL Lamp On
OccursAlways

Trouble Codes

P0300Multiple Misfire Detected