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1999 Chevrolet Silverado 1500 4.8L Hesitation, MIL Lamp on, backfires
Posted to GM Driveability on 6/9/2007 14 Replies

checked fuel reg, working fine & not leaking, unpluged downstream o2s, ran better but still set same codes, plus set codes for low activity on sensors, ofcorse, i have also sprayed intake for leaks, fuel trims had no change. i also checked fuel volume, plenty ...

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  Related Documents & Media  1999 Chevrolet Silverado 1500

 
Message Closed w/Summary

car Vehicle Data

1999 Chevrolet Silverado 1500

VIN 2GCEK19V7X
Engine4.8 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsHesitation, MIL Lamp on, Backfires
OccursUnder Load, on Accel, Intermittently
Misc.Downstream02sensorssignallow

Trouble Codes

P0137Heated Oxygen Sensor (Bank 1 Sensor 2) Circuit Low Voltage
P0157Heated Oxygen Sensor (Bank 2 Sensor 2) Circuit Low Voltage
Message Closed w/Summary

car Vehicle Data

1999 Chevrolet Silverado 1500

VIN 2GCEK19V7X
Engine4.8 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsHesitation, MIL Lamp on, Backfires
OccursUnder Load, on Accel, Intermittently
Misc.Downstream02sensorssignallow

Trouble Codes

P0137Heated Oxygen Sensor (Bank 1 Sensor 2) Circuit Low Voltage
P0157Heated Oxygen Sensor (Bank 2 Sensor 2) Circuit Low Voltage