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1994 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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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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