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.
Resources for the Repair and Maintenance of your 1993 Mercury Grand Marquis
1993 Mercury Grand Marquis
1993 Mercury Grand Marquis Problems
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.
1993 Mercury Grand Marquis Recalls (Recent)
Summary: ON CERTAIN PICKUP TRUCKS, PASSENGER VEHICLES, SPORT UTILITY VEHICLES, AND MOTOR HOMES CHASSIS, THE SPEED CONTROL DEACTIVATION SWITCH MAY, UNDER CERTAIN CONDITIONS, LEAK INTERNALLY AND THEN OVERHEAT, SMOKE, OR BURN.Learn more »
Summary: FORD IS RECALLING 225,000 MY 1992-2003 ECONOLINE, MY 1993-1995 TAURUS SHO, MY 1992-1998 CROWN VICTORIA, MY 1993 BRONCO, F-SERIES, MY 1995-1997 F-SERIES SUPER DUTY STRIPPED CHASSIS, MY 1992-1998 MERCURY GRAND MARQUIS, AND MY 1992-1995 LINCOLN TOWN CAR VEHICLES. THE AFFECTED VEHICLES WERE PREVIOUSLY REPAIRED USING A WIRING HARNESS THAT IS NOT COMPATIBLE WITH THE VEHICLE CIRCUIT POLARITY.Learn more »
Summary: VEHICLE DESCRIPTION: PASSENGER VEHICLES. THE SPEED CONTROL DEACTIVATION SWITCH CAN DEVELOP A RESISTIVE SHORT IN THE ELECTRICAL CIRCUIT THAT COULD POTENTIALLY RESULT IN AN UNDERHOOD FIRE. A FIRE IS POSSIBLE BOTH WHEN THE VEHICLE IS RUNNING AND WHEN THE VEHICLE ENGINE IS OFF. ALSO, THE SHORT COULD DISABLE THE SPEED CONTROL SYSTEM OR CAUSE THE BRAKE LIGHT FUSE TO OPEN.Learn more »
1993 Mercury Grand Marquis Questions and Answers
how to change the serpentine belt
Problems: Removing key from ignition. Warning alarm (with key removed)will not turn off. When key turned to START will sometimes fail to engage starter. The problem seems to point to ignition swi...
93 grand marquis won't idle after warming up. always happens
My 1993 started having AC problems shortly after a recharge. I noticed a burning smell as I came down a highway ramp. The temperature coming out of the vents was no longer cool. I found the AC Fu...