2004 Mercury Grand Marquis acceleration problems

Filed Sep 1, 2022 · Acceleration, Engine · MI · fire

While driving, I came to a stop light and suddenly, the car idled high and lurched forward while my foot was on the brake, luckily, I was stopped well away from the vehicle in front of me. The car idled high and seemed to have a mind of it's own. I took the back roads home and backed into our garage. The car smelled hot, and I though I had smoked my brakes, trying to keep control of it. Later that night, I told my husband about the car's actions and he did not believe me, though my daughter who was with me at the time confirmed that the car had indeed accelerated on it's own. My husband started the car and it did idle high and get hot once again, although only parked with no one in it. He thought he knew what the problem was and we turned off the car and closed the hood and went inside to order the part. A few minutes later, we heard a couple popping noises and I opened the door that led into the garage from the basement. Smoke was coming into the house and my husband said that a flame shot over my head. The car had caught on fire under the closed hood. We called the fire department, but by the time they arrived, a good portion of the basement was on fire. The house was a total loss. My husband though that the pvc elbow under the hood was sticking closed, so that is the part we were going to order. Unsure, if that was the real cause or not. The car did not have any warning lights or any other indications of a problem before this incident.

Filed Oct 1, 2015 · Acceleration, Lights · 80,000 miles · AZ

Vehicle headlights work intermittently . Cruse control does not reset or turn on when supposed to. This is also an intermittent problem, sometimes resetting, and sometimes not. Headlights would sometimes not turn on when driving unless pulling turn signal arm toward steering wheel and holding. High beams only would work.

Filed Jul 22, 2015 · Acceleration, Brakes · 58,000 miles · MO

Tl* the contact owns a 2004 mercury grand marquis. While the vehicle was coming to a stop, the contact depressed the brake pedal and the speed and rpms increased without warning. The contact continued to depress the brake pedal; however, the vehicle failed to respond. The contact powered the vehicle off and noticed blue smoke emitting from the rear of the vehicle. The vehicle was taken to the dealer, but the failure was unable to be determined. The vehicle was not repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 58,000. Ma 09/25 updated 12/05/2017

Filed Nov 30, 2011 · Acceleration · 50,000 miles · FL

Tl* the contact owns a 2004 mercury grand marquis. While driving approximately 65 MPH, the vehicles speed increased. When the brake pedal was engaged, the vehicle began to reduce speed. The contact maneuvered onto the emergency lane and turned the vehicle off. After restarting the vehicle, it began to function normally. The failure occurred three times. The vehicle was taken to an authorized dealer for diagnostic testing and the they were unable to diagnose the failure. The manufacturer was not made aware of the defect. The approximate failure mileage was 50,000. The VIN was unavailable.

Filed Aug 8, 2011 · Acceleration · 50,000 miles · MO

Tl* the contact owns a 2004 mercury marquis. The contact stated that while driving 20 MPH with the brakes engaged, the vehicle suddenly accelerated. The contact stated that in order to stop the vehicle, he had to shift into neutral and shut the engine off. The vehicle was not taken to a dealer to have the failure diagnosed. The manufacturer was not made aware of the failure. The vehicle was not repaired. The failure mileage was 50,000 and the current mileage was 67,000.

Filed Jul 8, 2011 · Acceleration · 27,800 miles · MA

Tl* the contact owns a 2004 mercury grand marquis. The contact stated that while in reverse, the vehicle surged backwards until heavy pressure was applied to the brakes. The vehicle was taken to an authorized dealer where the contact was informed that the failure was normal. The vehicle was not repaired. The failure mileage was 27,800.

Filed Jun 16, 2011 · Acceleration · 71,000 miles · MS

I own a 2004 mercury grand marquis ls that unexpectedly goes into unintended acceleration when slowing down or stopping vehicle. I never know when the unintended acceleration will occur. First noticed problem at about 24000 till now at 71000 miles. The problem occurs usually in a line of traffic as I am slowing down or slowing down to stop at a stop sign or traffic light. Or parking the vehicle. Suddenly the engine starts racing and sometimes the vehicle will jump forward rapidly (sudden unintended acceleration). I have to apply the brakes rapidly and with extreme pressure to keep the vehicle from hitting the vehicle in front of me or to keep from running a traffic light or stop sign. Most of the time when the engine races and I apply the brakes the rear wheels will continue to spin at a high rate even to the point of causing the rubber on the tires to smoke and still try to push me forward. After applying the brakes I must turn off the engine using the key to stop the unintended acceleration. This is a serious safety problem. I noticed the problem not long after purchasing the car and reported it to the dealer dub herring ford in picayune, ms. While the car was still under warranty. They didn't do anything to check or fix the problem. They seemed not to worry or be concerned about this problem! I reported the problem several times to the dealer with no success. I then reported it to the ford motor company several times and they referred me to the dealer which didn't do anything to fix the problem to start with. I then took the car to an independent repair shop and they tried to find out from the dealer and ford co. If there was a recall or notation or fix for the problem. The independent shop said the dealers and ford co. Wouldn't give him any information concerning the problem. They asked me to contact ford motor co. And see if I could get any response for a fix or repair and got no help from them. I am lodging a formal complaint against ford and the dealer.

Filed May 12, 2010 · Acceleration · 57,692 miles · OR

Three times my 2004 mercury marquis has had shown "prius like" problems. Once in dry summer , then twice in winter in the pacific nw.the last time I was into the intersection when I slammed on my parking brake to stop the car but the motor was still racing.

Filed May 3, 2010 · Acceleration · 88,000 miles · MA

Unintended acceleration: last year (feb 2009) my 2004 mercury grand marquis had an unintended acceleration which I (weight lifter) could barely control and I almost crashed into 2-cars. I also had to have the brakes replaced due to severe braking required to stop the car due to the unintended acceleration I used a reliable mechanic (highly rated by the state of ma) as the local ford dealer shops are over-priced and unreliable. No diagnostic codes showed-up at the shop after the problem, but I would not have my wife drive this car? The car is well maintained and I had a previous grand marquis, so I know the car better than most. Have you heard about this problem and is there a recall? Ford was contacted on feb 23 2010, via their protal, and indicated that there was no problem or recall, and suggested that I go to their dealer (did not go as I have no need for bs). I informed my local mechanic that the car went into overdrive and I had to drive over the curb (brake to floor to stop it).l burned out the brakes but no one died. There was no diagnostic codes that showed a braking or other electronic problem.

Filed Mar 21, 2006 · Acceleration, Transmission · 16,890 miles · OH

Dt*: the contact stated while approaching a stop under normal braking, the vehicles engine revs and surges forward. The brake pedal must be depressed to the floor to stop the vehicle. This happened 5 times and the vehicle was inspected by the dealer however; the problem could not be duplicated. The vehicle was driven over 6,000 miles when the problem returned. It was taken back to the dealer for service and again the dealer was unable to duplicate the problem. *ak the consumer believed there is a problem with the transmission. Updated 04/06/06.