Mercury Grand Marquis owners have reported 1 problem related to car throttle stuck (under the vehicle speed control category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Mercury Grand Marquis based on all problems reported for the Grand Marquis.
Started vehicle to move it in my driveway. Put it in drive and throttle stuck open and vehicle slammed my garage corner. Tried putting it in park and it went into reverse (brake override did not work) instead and crossed street, went across neighbors landscaping stones and slammed into the house next door's front porch at which time the ignition shut down and the car came to a stop. Many thousands of dollars in damages to all three homes.
See
all problems of the 2005 Mercury Grand Marquis
🔎.