Three problems related to ignition have been reported for the 2000 Mercury Grand Marquis. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2000 Mercury Grand Marquis based on all problems reported for the 2000 Grand Marquis.
The interior lights come on when there is no one in the vehicle and no key is in the ignition. No other lights come on.
2000 Mercury Grand Marquis LS VIN 2mefm75w5yx707045. While driving at 55 mph the car stalled and couldn't be started until pulled over to the side of the road. When towed and repaired at the Mercury garage, the only cause was a defective #8 cylinder coil/plug assembly. I believe this is a very dangerous condition. I found out later that Ford has a service bulletin out for coil/plug failures. A couple of weeks before this the #7 coil/plug assembly shorted out but it did not cause the car to shut down. I believe Ford should recall 2000 Mercurys and replace all 8 of the coil/plug assemblies. I bought the car new. It was my 3rd Grand Marquis and my last. I traded the car as a result of the #8 coil/plug failure . You may give Ford this information.
Consumer 2000 Mercury marquis LS shifts gears on its own at 45 65 mph and then the trac control light comes on. When the trac light came on, the vehicle completely shut down, as if the consumer had used the key to turn off the ignition. After several visits to different dealers, no on has been able to find the problem.