Mercury Grand Marquis owners have reported 2 problems related to engine knocking noise (under the engine and engine cooling 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.
The contact owns a 1996 Mercury Grand Marquis. While driving 35 mph, the vehicle began making a knocking noise and the contact noticed smoke rising from underneath the hood. She pulled the vehicle over and had it towed to the repair shop. The mechanic stated that the plastic intake valve melted. The purchase date was unknown. The current and failure mileages were 89,021. The dealer stated 1 set of disc pads, 2 new rotors, and clutch fan. Updated 09/25/07.
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Knocking noise from engine/transmission area when car is stopped at idle, transmission in gear, windows closed and heater fan off. Problem: intermittent, erratic, muffled knocking noise. Heard from inside the car.
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