Problem Reports
Problem with your car? See what our experts say or submit your own.
1999 Mercury Grand Marquis Problems
Airbag Light Due to Failed Spring in Seat Belt Buckle
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.
Coolant Leak and/or Engine Overheating Due to Cracked Intake Manifold
The composite (plastic) intake manifold may crack near the thermostat housing and cause a coolant leak. Ford released an updated manifold that was reinforced to prevent a recurrence. No recall was issued for this problem but Ford did extend the warranty to seven years on some models from the date of purchase.
Engine Performance Problems Due to Failed Throttle Position Sensor
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.
Engine Oil Leak from Right Head Gasket
An oil leak may develop from the the right side head gasket. Oil from this type of leak will commonly drip onto the starter. Our technician tell us an updated head gasket is available to correct this concern.
Heater Hose Outlet May Leak Coolant at Back of Intake Manifold
The heater hose outlet may leak coolant at the back of the intake manifold. Sometimes this is misdiagnosed as a leaking intake manifold gasket because it resembles a leaking manifold.
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