Car Problem Reports

Mercury Grand Marquis Misfire due to failed spark plugs or ignition coil

Mercury Grand Marquis Problem
4 Reports
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Model Years Affected: 1997, 1999, 2000

Average Mileage: 100,050 mi (80,101 mi - 120,000 mi)


Bad spark plugs or an ignition coil can cause ignition misfire, which will illuminate the Check Engine Light.

  • Visitor, , 80,101 mi

    one morning the check engine light went on and the car rode rough. I figured bad gas or fuel filter. 2 miles on the check engine light started blinking. Call to mechanic told me to get the car to him ASAP. Drove 6 miles home going 10mph on the shoulder, praying all the way. Bad ignition coil. He replaced all the plugs. Got off cheap, could have been catalytic converter or worse. Otherwise great highway car.

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