1998 Mercury Mountaineer no power

1998 MERCURY MOUNTAINEER
150,000 MILES • V8 • AWD • AUTOMATIC
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CASEY MCCALLEY
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  • 1 POST
have replaced fuel filter,camsensor, fuelpresure regulator.o2 sensor. come to a hill will not go up will idle up to seed if you feather pedal. butwhen up to speed does not shift.have cheched codes has alot but can,t be every thing.put in idle seems good put in gear drops power.
Sep 10, 2010 at 4:23 PM
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RASMATAZ
  • CERTIFIED EXPERT
  • 75,992 POSTS
Lack of acceleration,chugging,hesitating,jerking,bogging,misfiring etc. could be caused by one of the following below:

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard it.
Sep 10, 2010 at 7:34 PM