Mercury Grand Marquis owners have reported 2 problems related to loud engine 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 2003 Mercury Grand Marquis. The contact stated that there was an abnormal noise coming from the engine and the check engine warning indicator illuminated. The vehicle was taken to an independent mechanic where it was diagnosed that the number two cylinder spark plug misfired and the head of the motor needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 178,000.
See
all problems of the 2003 Mercury Grand Marquis
🔎.
While driving 55 mph a loud noise was heard coming from the front. Vehicle then stalled. Consumer restarted the vehicle and pull over. Then, consumer noticed that oil leaked underneath. Consumer drove vehicle to the dealer for inspection, and mechanic determined that the cylinder head cracked, and needed to be replaced (20794 miles). Recently the consumer noticed another oil leak which appeared to be the same as that from the first cylinder head. The service manager inspected the vehicle and concluded that oil was leaking from the cylinder head again (59700 miles).
See
all problems of the 1999 Mercury Grand Marquis
🔎.