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definitely annoying
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
23,500 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2009 Mercury Grand Marquis engine problems

engine problem

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2009 Mercury Grand Marquis Owner Comments

problem #2

May 182013

Grand Marquis 8-cyl

  • 27,000 miles


I was driving at 45 mph and applied the brake to stop. The engine revved to 2,000 RPM. I was able to stop with very hard braking using both feet. The engine continue revving at 2,000 RPM even after the car had stopped. I placed the transmission in neutral and the engine revved even faster. The engine did not slow down until I turned off the ignition. After leaving the engine off for around two minutes, I restarted the engine and it resumed running at around 500 RPM. My 23 year old son was seated next to me and verified that nothing was touching the accelerator while the engine was revving at 2,000 RPM and that both of my feet were on the brake. The engine has revved when I applied the brake at least seven other times; however, the revving stopped after one or two seconds. I have taken the car to a Ford dealer three times for this problem; however, they have not been able to find the cause of the problem.

- Ridgeland, MS, USA

problem #1

Jun 022012

Grand Marquis 8-cyl

  • 20,000 miles
My wife was driving around 25 mph and less than one mile from our house. When she applied the brakes to stop at a stop sign the engine revved up. I was riding with her and observed the engine rev to around 2,500 RPM before slowing down. I also observed that her right foot was on the brake and that nothing was touching the accelerator. The cruise control had not been turned on. This was at least the fourth time this year that the engine revved up when the brakes were applied. The dealer could not find the problem and the engine did not rev while the dealer was testing the car.

- Ridgeland, MS, USA

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