CAR

1991 Mercury Marquis

Tiny

tweezy1325

February, 12, 2011 AT 8:20 PM

My 91 grand marqui is slow to accell when I press the gas pedal

FOUND 4511 RELATED QUESTIONS

1 Answer

Tiny

rasmataz

March, 12, 2011 AT 12:34 AM

Do you have a check engine light on?

Lack of acceleration, chugging, hesitating********, 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.
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 and keep testing.

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