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1998 Mercury Mountaineer 4.0L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Misfire, Poor Fuel Economy, MIL Lamp on
Posted to Ford Driveability on 7/9/2002 13 Replies

This vehicle has a definate misfire all of the time. Found codes 301,303,304,305, and 171. Pulled plugs out and found five and one soaked with gas. Inj. test good, fuel presure within specs and does not lose pressure when I shut the key off.I have checked for ...

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Message Closed w/FIX

car Vehicle Data

1998 Mercury Mountaineer

VIN 4M2ZU54E1W
Engine4.0 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsExcessive Emissions, Poor Idle Quality, Hesitation, Surge, Misfire, Poor Fuel Economy, MIL Lamp On
OccursAlways

Trouble Codes

P0171Fuel System Too Lean (Bank 1)
P0301Cylinder 1 Misfire Detected
P0303Cylinder 3 Misfire Detected
P0304Cylinder 4 Misfire Detected
P0305Cylinder 5 Misfire Detected
Message Closed w/FIX

car Vehicle Data

1998 Mercury Mountaineer

VIN 4M2ZU54E1W
Engine4.0 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsExcessive Emissions, Poor Idle Quality, Hesitation, Surge, Misfire, Poor Fuel Economy, MIL Lamp On
OccursAlways

Trouble Codes

P0171Fuel System Too Lean (Bank 1)
P0301Cylinder 1 Misfire Detected
P0303Cylinder 3 Misfire Detected
P0304Cylinder 4 Misfire Detected
P0305Cylinder 5 Misfire Detected