Engine Shut Off Without Warning Problems of Mercury Grand Marquis

I believe this issue effects millions of Ford and Mercury vehicles, many of which are taxi, government, and police cars. Apparently, the computer (pcm) that controls the engine can shut the engine down while the vehicle is driving when certain sensors fail (at least 2 known sensors per my research). I found this out at 65 mph, 2 hours from home. I was told by the dealer that there are no new pcms made for my 2000 car, and that I had to rely on a rebuilt after market pcm. The aftermarket seller related that these computers last approximately 10 years. Even if I replace this part, I believe this effectively makes my (and any such) car a risk to drive, as most rebuilt auto parts are created by simply replacing any failed components out of the many components in the assembly of the part, and leaving others still old and worn. When would the other parts fail, and if the car is operating is a high risk unknown. On top of the fact that this creates a spectacular hazard to motorists, I don't think that's fair to consumers. I can demonstrate what this car does, and go over the oem factory manuals where they cite "replace the pcm". Also, why do these sensors fail to a very unsafe condition, have no logic check (such as testing other sensors to see if they concur before an engine shut down) and why can't they be disconnected to allow the engine to keep working till you can get to the repair?.

See all problems of the 2000 Mercury Grand Marquis 🔎.

The vehicle recently experienced two sudden acceleration events in two days 15 miles apart while decelerating and using the brake in what could only be related to an intermittent failure of the electronic throttle control. While on vacation during a 75 deg evening with the car at operating temperature I was navigating some s turns high on a bluff at 30mph. While coming into a corner with my foot on the brake and slowing to around 20mph the car suddenly accelerated. I hit the brakes hard, turned away from the corner to avoid going over the cliff and turned off the key. All this happened in less then 5 seconds. The next day mid afternoon after driving 20 miles I was leaving a park and traveling on a level straight road at around 25mph. Coming up to a stop sign I let off the gas and started applying the brake (like the day before) at about 15mph the car violently accelerated. I hit the brakes hard again, the rear tire started spinning and it pushed the car through the crosswalk past the stop sign and into oncoming traffic by about 4ft before I got the engine shut off. Once again this all happened in a matter of seconds. After a restart everything was normal again. I drove around 250 mi to get home without any further incident. Two weeks prior to these events I had the car at the dealer to program a new transponder key, reset the keyless entry and test the throttle to see if the initial deadband could be adjusted (no adjustment was done). After the incident I returned to the dealer and they said they have never heard of this problem, there are no recalls or tsbs, and the ecm would not datalog anything since there was no trouble light. They said there was nothing they could do. I consider this unsatisfactory, deem it a major safety defect and Ford should be required to correct this immediately. A quick search reveals I am not the only one who has experience this.

See all problems of the 2008 Mercury Grand Marquis 🔎.

While driving up a short moderate grade, the car engine shut off. The battery (nearly new) was fine and the dashboard lights were displayed with icons lit. The steering was affected and the car drifted to a stop on a level surface. I was successful in restarting the car on the first try and this incident has not reoccurred. I did not make note of what the dashboard lights were, as I was more interested in restarting the car. I do have a rather heavy key set (heavier than most).

The contact owns a 2002 Mercury Grand Marquis. While driving 35 mph the vehicle shut off. The check engine, battery, and track warning lights illuminated. The contact stated that she had to wait an hour to restart the vehicle. As of August 8, 2007, the dealer has not repaired the vehicle. The current and failure mileages were 73,000.

See all problems of the 2002 Mercury Grand Marquis 🔎.

2000 Mercury Grand Marquis engine shut down causing consumer to lose power brakes and steering. This was caused by a short in spark plug. The short occurred in the spark plug on the #4 cylinder. This confused the power control module with signals it was receiving from the engine and tried to compensate which affected other systems and a sort of chain reaction occurred.

Vehicle was going about 35 mph when all of a sudden it started shaking. Then, lost its traction control, and caused the lights in the dashboard to turn off. This eventually led the engine to shut off, and the driver lost steering. Taken to dealer for a checkup, but the results showed that the cause was undetermined. Car shuddered, followed by engine shut down resulting in loss of power brakes and steering.

While driving at 50mph on flat surface and with no warning vehicle shut off. Consumer had to pull over. *akconsumer looked through the manual and found an article explaining what to do when the vehicle is bumped and fuel shut off. The vehicle was never bumped. Consumer followed the instructions and the vehicle started back up immediately and has been running since.

See all problems of the 1998 Mercury Grand Marquis 🔎.

Engine shut down completely while proceeding across a busy intersetion, consumer was able to shift into neutral and restart engine while still rolling and continued on,engine check light would stay on, consumer had aarm reman sensor asy-engine elec. Replaced, and also pcm reprogrammed.

See all problems of the 1997 Mercury Grand Marquis 🔎.

When stopping or braking the vehicle shut off. The vehicle was taken to the dealer. The dealer indicated that the vehicle's warranty was expired. The consumer felt that the dealer should repair the vehicle free of charge since the original defect occurred while the vehicle was still under warranty.

See all problems of the 2001 Mercury Grand Marquis 🔎.