Two problems related to engine exhaust system have been reported for the 1997 Mercury Grand Marquis. The most recently reported issues are listed below.
Motor heated up, was extremely hot, had to have vechicle towed to a repair shop. They found a cracked plastic intake manifold . It was replaced and resolved the problem.
The engine on my '97 Grand Marquis blew up with 37,057 miles on it. According to the service dept, a valve stuck open, the engine backfired into the intake and blew it out. I need to replace the intake and the cylinder head, and have been quoted about $3500 to repair it. According to the Ford factory rep, Ford will not participate in the repair because the car is over 6 years old.