1991 Mercury Grand Marquis Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1991 Mercury Grand Marquis
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1991 Mercury Grand Marquis ProblemsMalfunctioning Headlights
The car had 64600 miles on it and the headlights started going out while driving, which can be very dangerous. The problem is in the Light Control Module which is an expensive part (around $500 to $600 + labor).
A spring in the seat belt buckle may wear or fail, causing the airbag light on the instrument panel to illuminate. Failed buckles will require replacement.
The throttle position sensor (TPS) may fail. Common symptoms of a defective TPS can be rough idle, hard starting, hesitation on acceleration, poor fuel economy, and stalling.
1991 Mercury Grand Marquis Questionswhy is my oil light coming on when i come to a stop (1 answer)
The oil light comes on ehen I stop but comes off as the car starts moving