• Tiny
  • tweezy1325
  • 1991 Mercury Marquis

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

Do you
have the same problem?
Saturday, February 12th, 2011 AT 8:20 PM

1 Reply

  • Tiny
  • rasmataz
  • Member

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.

Was this
Saturday, March 12th, 2011 AT 12:34 AM

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