Three problems related to underhood wiring have been reported for the 1998 Mercury Grand Marquis. The most recently reported issues are listed below.
After replacing several components of the electrical system including pcm, two power packs and a wire harness installed and the vehicle still does not start.
While parked smoke came from under the hood. The fire department opended the hood and the vehicle was engulfed in flames. Dealer and manufacturer have been notified.
Wiring harness under the hood resulting in a fire.