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1999 Chevrolet Express 3500 5.7L Hesitation, MIL Lamp on
Posted to GM Driveability on 6/7/2005 3 Replies

When this symptom does finally happen the O2 sensors drop to about 40 mv and there is no throttle [...] the long term fuel trim stays about [...] sensors seem in spec except the O2's. I would think the LT fuel trim would start to rise but it doesn'[...] ideas?...

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  Related Documents & Media  1999 Chevrolet Express 3500

 
Message Closed w/FIX

car Vehicle Data

1999 Chevrolet Express 3500

VIN 1GBJG31RXX
Engine5.7 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsHesitation, MIL Lamp On
OccursHot, on Accel, Intermittently
Misc.Cutaway

Trouble Codes

P0131Heated Oxygen Sensor (Bank 1 Sensor 1) Circuit Low Voltage
P0151Heated Oxygen Sensor (Bank 2 Sensor 1) Circuit Low Voltage
Message Closed w/FIX

car Vehicle Data

1999 Chevrolet Express 3500

VIN 1GBJG31RXX
Engine5.7 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsHesitation, MIL Lamp On
OccursHot, on Accel, Intermittently
Misc.Cutaway

Trouble Codes

P0131Heated Oxygen Sensor (Bank 1 Sensor 1) Circuit Low Voltage
P0151Heated Oxygen Sensor (Bank 2 Sensor 1) Circuit Low Voltage