My 2000 Mercury Grand Marquis won't accelerate pass 40mph. Diagnosis check reveals nothing wrong with the major functions of the engine. C foam was my best guess. Then the wheel speed sensor. Thanks!

Asked by Jul 29, 2015 at 03:36 PM about the 2000 Mercury Grand Marquis LS

Question type: Maintenance & Repair

4 Answers

19,225

how much fuel volume / pressure is at the intake at idle and cruse?

1 out of 1 people think this is helpful.
Best Answer

Would love to answer but I don't know accept I idle the car with engine running a lot.

31,425

Possible clogged catalytic converter. Have someone check the converter and the exhaust system.

19,225

one or the other....unless its so retarded/worn.

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