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2003 GMC Envoy XL SLT 5.3L Poor Idle Quality, Stall, Misfire, MIL Lamp on
Posted to GM Driveability on 1/20/2013 31 Replies

Stumped again. This Envoy idles terrible and even dies out at idle sometimes. Both upstream 02s run at about 40 -60 mv. Soon as I touch the throttle they respond and go to 800 -900mv and they start responding perfectly. Fuel trims at idle are above 50 but I ca...

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  Related Documents & Media  2003 GMC Envoy XL SLT

 
Message Closed w/FIX

car Vehicle Data

2003 GMC Envoy XL SLT

VIN 1GKET16P93
Engine5.3 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsPoor Idle Quality, Stall, Misfire, MIL Lamp On
OccursIdle

Trouble Codes

P0171Fuel System Too Lean (Bank 1)
P0174Fuel System Too Lean (Bank 2)
P0300Multiple Misfire Detected
Message Closed w/FIX

car Vehicle Data

2003 GMC Envoy XL SLT

VIN 1GKET16P93
Engine5.3 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsPoor Idle Quality, Stall, Misfire, MIL Lamp On
OccursIdle

Trouble Codes

P0171Fuel System Too Lean (Bank 1)
P0174Fuel System Too Lean (Bank 2)
P0300Multiple Misfire Detected