2005 Mercury Grand Marquis: sudden unintended acceleration

Filed Jan 30, 2018 · Acceleration, Engine · 39,000 miles · NJ

Tl* the contact owns a 2005 mercury grand marquis. While driving approximately 5 MPH and then depressing the brake pedal to slow the vehicle down, the vehicle accelerated without warning. To avoid crashing into the preceding vehicle, the contact was able to veer to the right and continue driving. There was no warning indicator illuminated. The failure recurred three times. The vehicle was taken to porter ford (600 ogletown rd, newark, de 19711) where it was diagnosed that the throttle body motor assembly was sticking and needed to be replaced. The vehicle was repaired. The manufacturer was not contacted. The approximate failure mileage was 39,000.

Filed Mar 2, 2017 · Brakes · 130,000 miles · VA · crash

Vehicle would not stop when foot brake was applied. When brake was applied vehicle lunged forward. Driving on a main road, passing through a school zone and approaching a stop light. This was the second time vehicle would not stop in the past two months. I hit the rear of another vehicle damage occured.

Filed Jun 5, 2014 · Acceleration, Transmission · 12,000 miles · MD

Sudden acceleration. The car did this after starting it in the driveway. Upon placing the car in drive the car accelerated burning rubber in the driveway. Had to stand on brakes and turn ignition off to stop car. The second incidence happened while braking for a red light, I had to shift car into neutral to stop car. Unsure of mileage in this instance. Most recently while in south carolina I was sitting at a red light with my foot on the brake the car suddenly accelerated and I had to shift to neutral to avoid rear ending car in front of me. (mileage 60,000).

Filed Feb 13, 2013 · Acceleration · 25,000 miles · FL

Tl* the contact owns a 2005 mercury grand marquis. The contact stated that the vehicle exhibited sudden acceleration and the engine rpms would idle abnormally very high seconds prior to the failure occurring. The contact was able to stop the vehicle by shifting into neutral. The contact took the vehicle to the dealer however, the dealer was unable to diagnose the failure. The dealer then recommended having the throttle body replaced but could not guarantee that the repair would remedy the failure. The failure mileage was 25,000.

Filed Aug 8, 2012 · Acceleration · FL

Tl* the contact owns a 2005 mercury grand marquis. The contact stated that the vehicle suddenly accelerated whenever the contact was braking to a stop. The failure recurred several times. The vehicle was not taken to the dealer. The failure mileage was unknown and the current mileage was 46,000.

Filed Oct 28, 2011 · Acceleration, Lights · 150 miles · FL

Tl* the contact owns a 2005 mercury grand marquis. The contact stated that while driving at any speed and attempting to brake, the vehicle suddenly accelerated. The failure was experienced numerous times. The vehicle was taken to the dealer several times for the failure where the dealer test drove the vehicle, but was unable to duplicate the failure. The vehicle was then taken to a local mechanic for further inspection. The contact also experienced failures with the headlights. The headlights were replaced but the abnormal acceleration failure was not repaired. The VIN was not available. The failure mileage was 150 and the current mileage was 15,600.

Filed Aug 9, 2011 · Acceleration · 5,000 miles · MD

Tl* the contact owns a 2005 mercury grand marquis. While driving at approximately 10 MPH and depressing the brakes, the vehicle suddenly accelerated until the brake pedal was released. Also, while parked, the contact depressed the brakes and the vehicle lunged forward. The failure recurred intermittently. The vehicle was not taken to the dealer for diagnostics or repairs. The VIN was not available. The approximate failure mileage was 5,000.

Filed May 26, 2009 · Acceleration · 17,816 miles · NC · crash · 3 injuries

Arrived at son's home and stopped in driveway with foot on brake when vehicle suddenly accelerated uncontrollably, spinning wheels in gravel driveway. Driver swerved to avoid hitting garage and ran head on into a pine tree resulting in severe damage to entire front end of vehicle (expect vehicle to be considered a total loss) and injuries to the driver and two passengers. Both driver and passenger airbags deployed. Prior to arriving at destination, driver had used the cruise control on the vehicle. Vehicle has not yet been moved and am currently waiting for insurance adjuster to inspect vehicle. Both driver and front seat passenger suffered severe bruising on face, arms, chest and abdomen, presumably from deployment of the air bags as well as from the seat belts. Rear seat passenger suffered a contusion on the forehead and a sprained hand. All vehicle occupants were transported to hospital for evaluation and released.

Filed Jul 16, 2007 · Acceleration · 31,900 miles · MT · crash · 2 injuries

Tl*the contact owns a 2005 mercury grand marquis. While driving 2 MPH, the vehicle accelerated without warning to approximately 75 MPH. The contact depressed the brake pedal, but the vehicle failed to stop. The failure caused her to crash into a fire hydrant. The driver sustained a broken back and the front seat passenger sustained a bruised bowel and internal bleeding. The vehicle was destroyed. As of july 16, 2007, the dealer has been unable to diagnose the cause of failure. The current mileage is 32,000 and failure mileage was 31,900.

Filed Jan 20, 2006 · Acceleration, Engine · NY · crash

This car has a dangerous defect. Randomly when in a stationary position, by holding the brakes, the engine and transmission sometimes suddenly accelerates powerfully, making it difficult to hold the car. I notified the dealer about this defect, several times in writing and by phone. Dec, 29, 2005 they took it on a drive, and claimed to have found no defect. Subsequently, jan, 15, 2006 at approximately 1:00 pm, I was stopped at a red light on grand st. Nyc behind an SUV, by holding the brakes, all of a sudden it accelerated, and it was impossible to hold the car. It slammed into the SUV in front of me, smashing my front. Luckily, the SUV was not damaged. But even more luckily, we did not get hurt, (I had in the car my wife, an adult daughter, and 2 grand children). In addition, I guess we were extra lucky that we had the SUV in front of me, which averted a catastrophic mowing down of pedestrians crossing. The dealers took in the car, and notified me yesterday, jan, 19, 2006, that they ran tests and find nothing wrong with the car.

Filed Jul 22, 2005 · Acceleration, Brakes · 200 miles · OK

Dt: when applying brake pedal pressure the pedal goes past the accelerator to the floor, most often this occurs when starting the vehicle and placing it in gear. When this occurs it is easy to hit the gas pedal as well when trying to apply brake pressure. This causes the tires to squeal and the car to lunge forward. Has been to a dealer who said he would have a service manager call the consumer about this problem, but he never returned the call. The service representative noted there was nothing wrong. No repairs or changes have been made.