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1995 Pontiac Bonneville 3800CC Poor Idle Quality, Misfire, MIL Lamp on
Posted to GM Driveability on 10/28/1999

Hi Everyone, I've got this Bonneville in the shop with a SES light onand rough idle. The O2 volts at idle are staying low (31mv)and will only fluctuate rich to lean if it is raised offidle. The short and long term fuel trim readings are fixedhigh at 159 and 18...

 
Message Closed w/FIX

car Vehicle Data

1995 Pontiac Bonneville

VIN 1G2HL2416S
Engine3800 / 6 cyl
EmissionsOBD-II Compliant
SymptomsPoor Idle Quality, Misfire, MIL Lamp On
OccursAlways, Idle
Misc.Supercharged Engine

Trouble Codes

P0131Heated Oxygen Sensor (Bank 1 Sensor 1) Circuit Low Voltage
P0171Fuel System Too Lean (Bank 1)
Message Closed w/FIX

car Vehicle Data

1995 Pontiac Bonneville

VIN 1G2HL2416S
Engine3800 / 6 cyl
EmissionsOBD-II Compliant
SymptomsPoor Idle Quality, Misfire, MIL Lamp On
OccursAlways, Idle
Misc.Supercharged Engine

Trouble Codes

P0131Heated Oxygen Sensor (Bank 1 Sensor 1) Circuit Low Voltage
P0171Fuel System Too Lean (Bank 1)