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1999 GMC Sierra 1500 SL 5.3L Misfire
Posted to GM Driveability on 3/29/2012 6 Replies

Fuel pressure is 56psi. Misfiring on cylinder 4 most of the time and sometimes on cylinder 6. Replaced coils and injectors. Injectors are noiding. Compression is 150 psi. Need help if anyone has any ideas, it would be greatly appreciated.

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  Related Documents & Media  1999 GMC Sierra 1500 SL

 
Message Closed w/FIX

car Vehicle Data

1999 GMC Sierra 1500 SL

VIN 2GTEK19T9X
Engine5.3 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsMisfire
OccursAlways

Trouble Codes

P0157Heated Oxygen Sensor (Bank 2 Sensor 2) Circuit Low Voltage
P0300Multiple Misfire Detected
P0332Knock Sensor Rear Circuit Low Voltage
Message Closed w/FIX

car Vehicle Data

1999 GMC Sierra 1500 SL

VIN 2GTEK19T9X
Engine5.3 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsMisfire
OccursAlways

Trouble Codes

P0157Heated Oxygen Sensor (Bank 2 Sensor 2) Circuit Low Voltage
P0300Multiple Misfire Detected
P0332Knock Sensor Rear Circuit Low Voltage