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1995 Mercury Grand Marquis Problems

Engine Performance Problems Due to Failed Throttle Position Sensor

for the Mercury Grand Marquis

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.

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Heater Hose Outlet May Leak Coolant at Back of Intake Manifold

for the Mercury Grand Marquis

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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EVP Sensor Failure May Cause Drivability/Fuel Economy Issues

for the Mercury Grand Marquis

The EGR valve position (EVP) sensor can fail on this vehicle. The EVP sensor measures the EGR valve position and transmits the date to the engine control computer. If it fails, drivability and fuel economy can suffer, the Check Engine Light will commonly illuminate.

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