Car Accelerates On Its Own problems of the 2006 Mercury Grand Marquis

The contact owns a 2006 Mercury Grand Marquis. While driving into a parking space at approximately 5 mph, the brake pedal was depressed and the vehicle unintendedly accelerated and crashed into the side of a concrete building. There were no injuries and a police report was filed. The vehicle was towed to an independent mechanic where the front end damages were repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 45,800.

The contact owns a 2006 Mercury Grand Marquis. The contact stated that while driving at 10 mph attempting to engage the brakes, the vehicle suddenly accelerated without warning. The failure recurred three times. The vehicle was taken to a dealer but was not diagnosed or repaired. The manufacturer was made aware of the failure. The failure mileage was 58,300.

I had an incident of unintended acceleration on my Mercury marquis. I was braking for a stop when the engine suddenly started racing. I put my foot on the brake hard but the car still continued to move slowly until I hit the car in front of me. There was no damage to either vehicle (fortunately) but the car's engine was completely out of control.

Driving at 50 mph. Passed slower-moving vehicle by pushing accelerator to floor(full power) during initial pass, then released accelerator. Engine rpm's did not reduce, but instead climbed rapidly with the throttle stuck at the "full power" position. The vehicle continued to accelerate rapidly, reaching a speed of about 75 mph in 50 mph zone on two lane road. Upon recognizing the accelerator was stuck in "wide open" position, I slammed my foot against the accelerator pedal repeatedly, and after about three strikes the engine rpm reduced to normal (consistent with accelerator pedal position) and I was able to regain control of the speed and slow the vehicle. I checked to ensure that neither the floor mat nor any foreign objects were impinging on accelerator pedal. I found no objects interfering with the accelerator pedal. This same problem occurred two more times within two weeks. I reported the events to my local mechanic and he ran a computer diagnostic on the system. It showed no abnormalities or codes. Two mechanics examined the system under the hood and noted no abnormalities. They indicated they "cleaned" something (contacts?). I subsequently took the vehicle onto a larger road without traffic present and attempted to duplicate the problem. When I pressed the accelerator to the floor (full throttle), the same problem occurred. The engine rpm continued to climb rapidly and the vehicle accelerated uncontrollably and rapidly. Taking my foot off the accelerator resulted in absolutely no reduction to engine power. Engine rpm and speed rapidly increased as the engine was stuck in the "full power" position. I was only able to regain control of the engine speed and vehicle speed by repeatedly slamming my foot against the accelerator pedal. After two or three hits, engine power reduced consistent with accelerator position.

Stopped at railroad crossing. Train moving. 1 car ahead of me at railroad. Stop. I was completely stopped. After being stopped for about a minute my car suddenly accelerate and slammed into car in front of me pushing car forward in the side of moving train. My car also slammed into train and was reversed and stopped on railroad post. During this time I could not stop vehicle. The vehicle was traveling at considerable speed.

I was driving up to a light and slowing down. When at 25mph the car suddenly accelerated and I had to put all my weight on the brake to stop. After about 10 seconds the car went back to normal and ran fine. Since that incident my car has done that twice with the same result and I am worried someone will get hurt. I have been researching this online and have found other complaints. I will be taking the car to my mechanic ASAP.

The contact owns a 2006 Mercury Grand Marquis. While driving at approximately 30 mph, the vehicle suddenly accelerated up to 50 mph although the contact depressed the brake pedal. The vehicle would not slow down even after the contact turned off the ignition and continued to coast up the hill until it crashed into a curb. There were no injuries but a police report was taken. The vehicle was towed to a local repair shop where it was repaired. After the repair, the dealer performed a diagnostic test on the vehicle but no failure was found. The contact called the manufacturer and was told that they would get back with him for an investigation. The current and failure mileages were 30,351.

The contact owns a 2006 Mercury Grand Marquis. When applying pressure to the brake pedal and placing the vehicle into reverse, the gear lurches forward unexpectedly. The contact has to switch the vehicle into neutral to stop the unintended acceleration. He took the vehicle to the dealer, but they could not identify the cause of the failure. The failure mileage was 27,000 and current mileage was 29,000. Updated 07/17/09 the consumer stated on 2 occasions, he started the vehicle; put it in drive and the motor raced and the vehicle lurches forward. He had to put the vehicle into neutral and turn off the ignition to stop the vehicle. The dealer was unable to duplicate the consumers concern. Updated 07/17/09.

The contact owns a 2006 Mercury Grand Marquis. The contact stated that while stopped at a stop light, there was an increase in the engine rpms. The contatc had to apply heavy pressure to the accelerator pedal to keep the vehicle stopped. The failure occurred intermittently and the vehicle also experience unintended acceleration. The vehicle was taken to the dealer, who inspected it and stated that there was no failure. The manufacturer was not notified. The failure mileage was 2,000 and the current mileage was 111,000. The VIN was unknown.