Unknown

- Grand Prairie, TX, USA

Air leak in intake manifold or egr or PCM system cylinder 3 misfire dirty fuel injection

- Dallas, TX, USA

The intake manifold is crack

- Stafford, VA, USA

The contact owns a 2000 Mercury Grand Marquis. While driving various speeds, the vehicle hesitated to accelerate. The failure occurred most frequently when traveling up hill. The failure was intermittent and the check engine warning indicator illuminated. The dealer was not notified. The vehicle was not diagnosed or repaired. The contact sprayed carburetor fluid on the intake manifold and noticed a crack. The manufacturer was made aware of the failure. The failure mileage was 118,000.

- Bronson, FL, USA

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?

- Greenwich, CT, USA

A spark was blown out of the cylinder head. The problem occurred 3 times (2010, 2014, 2014), each time a different cylinder. One of these times, it occurred to my wife 140 km away from home. I had to guess that it was a blown spark plug and instructed her to drive the car to toronto in this condition. Concern: Aside from the costly repair, I am afraid to use the car on a long trip for fear that this will happen at a place where a repair is not available. I suspect that the Ford company has modified the engine along the way, considering the fact that on a previous model I had owned for a long time (1993 Grand Marquis), the problem had never occurred.

- Toronto, NY, USA

While replacing the thermostat, a crack developed in the plastic crossover channel in the plastic intake manifold allowing the engine coolant to leak when the thermostat opened. Ford knows this to be defective and has replaced the all plastic manifold with an aluminum crossover for the coolant. The vehicle has 71,290 miles.

- Boca Raton, FL, USA

The contact owns a 2000 Mercury Grand Marquis. The contact stated that the thermostat was leaking. The thermostat was replaced however, the intake manifold failed and fell into the thermostat after the replacement. Additionally, there was a leak in the sensor coolant temperature sensor area which was repaired with a sealing solution and the thermostat was replaced because the plastic inside the intake manifold was deteriorated. The defect was not repaired or diagnosed. The current mileage was 170,000. The approximate failure mileage was 50,000.

- Jamaica , NY, USA