general problems of the 2004 Mercury Mountaineer

Engine died has repeated only a few times at or above 50mph over span of time.

I had picked up my kids from daycare and I put my vehicle in reverse and backed up. While backing up I heard a loud pop and I got out to see but there was nothing visible. So I put the vehicle in drive and as I was going down the street my vehicle axle broke and my truck hit the street in the middle of traffic. I took it to the Ford dealership and they said it was my axle and my differential had broken also, am I am lucky that I didn't have a bad accident with the extend of the damage of the differential. After I fixed that and it cost $2900. That still did not fix the problem and I had to replace the transfer case. Then all three of my Cadillac converters had to be replaced. I have had problem after problem and OH yeah the back rear gate has been cracked like the month after I bought it.

Just purchased a 2004 Mercury Mountaineer today. Driving home, using cruise/speed control at around 30mph and driving on a slight decline, the vehicle shut down. All indicator lights went on, and I had to coast to the side of the road. I put vehicle in park and restarted it without problem. There were no indicator lights (check-engine, etc. ) lit up. Immediately went to local Ford dealership and they had no clue, especially since the computer did not have any codes indicating a problem. . I'm canceling the check and returning the vehicle tomorrow.

I drove a 2004 Mercury Mountaineer SUV and as I was turning into the apartment complex from a complete stop, the gas pedal clamped down & I couldn't get the brake to work. My SUV was totaled & I ran into a full-sized pick-up truck, which was totaled too. I reported the problem to the police & my insurance company. The insurance company told me not to tell anyone else about it. It was late evening, so no kids were out, but being unable to control my vehicle, which totaled two full-sized trucks is scary!.

My 2004 Mercury Mountaineer accelerated on it's own as I was pulling into a parking space. The vehicle made a roaring sound. My foot never left the brake pedal and I could not stop it. I jumped the curb, went over a grassy area, over the sidewalk and did not stop until I hit a concrete building at approximately 25-30 miles per hour. It caused significant damage to the building and to the car. Airbag did not deploy. I have had the body damage repaired and my auto insurance has paid over $3,000 for that. My husband took it to our nearest Ford dealer where they ran a diagnostic and it showed an electronic malfunction. They said the throttle body assembly needs replacing. The technician did not give us a print-out and said he couldn't find it when we checked back later. We contacted Ford motor company to see if they would pay for the replacement because our insurance would not. They also will not pay for it, but sent us to another Ford dealer to run a diagnostic on the airbags. After explaining my ordeal to the technician, he agreed to also check the throttle body. He said their diagnostic test shows no problems with the airbag or the throttle body! he also stated that the first dealer could have wiped it from the memory of the computer. After my husband spoke with a customer service rep at Ford motor company today, she said she would request that the dealer who ran the first diagnostic test send us a copy of the print-out that he couldn't find for us. The car is going back into the shop tomorrow at a local private mechanic (not a Ford dealer technician) and we will take it from there. As of today, nothing has been repaired other than the body damage.

Throttle position sensor failed in 2004 Mercury Mountaineer. Car abruptly stopped accelerating while traveling and came to a stop. Fortunately I was in a near-empty parking lot when this occurred. It could have been a very dangerous situation had this occurred while I was on the road. After the car came to a stop, I was unable to move it forward for more than about 100 yards. It had to be towed. Dealer determined that loss of acceleration was due to "tp open intermittent. " dealer fixed problem.

While driving in 20 mph in congested traffic the vehicle suddenly accelerated and lunged forward. Owner had to steer the vehicle off the road to avoid hitting another vehicle. Owner shifted to park in order to stop vehicle. No injuries or accident occurred.