2004 Mercury Grand Marquis Vehicle speed control Problems

“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.”

“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). …”

“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? …”

“My wife was driving our 2004 Mercury Grand Marquis (pre-certified, bought off the showroom floor august 2004); our three teenage foster care children and I were passengers. Our marquis entered the parking lot of convenience store so that we could install air in left front tire. We did a u-turn in parking lot to proceed to air compressor. With her right foot on brake pedal, my wife steered the car through the u-turn, heading toward air compressor. Suddenly, without any warning, the car accelerated uncontrollably. …”

“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.”