2008 Mercury Grand Marquis fuel system NHTSA complaints: Fuel/Propulsion System

NHTSA — Fuel/Propulsion System Problems


hardly worth mentioning
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
80,500 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.

2008 Mercury Grand Marquis fuel system problems

fuel system problem

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2008 Mercury Grand Marquis Owner Comments

problem #2

Apr 172016

Grand Marquis

  • 75,000 miles


The vehicle recently experienced two sudden acceleration events in two days 15 miles apart while decelerating and using the brake in what could only be related to an intermittent failure of the electronic throttle control. While on vacation during a 75 deg evening with the car at operating temperature I was navigating some S turns high on a bluff at 30mph. While coming into a corner with my foot on the brake and slowing to around 20mph the car suddenly accelerated. I hit the brakes hard, turned away from the corner to avoid going over the cliff and turned off the key. All this happened in less then 5 seconds. The next day mid afternoon after driving 20 miles I was leaving a park and traveling on a level straight road at around 25mph. Coming up to a stop sign I let off the gas and started applying the brake (like the day before) at about 15mph the car violently accelerated. I hit the brakes hard again, the rear tire started spinning and it pushed the car through the crosswalk past the stop sign and into oncoming traffic by about 4ft before I got the engine shut off. Once again this all happened in a matter of seconds. After a restart everything was normal again. I drove around 250 mi to get home without any further incident. Two weeks prior to these events I had the car at the dealer to program a new transponder key, reset the keyless entry and test the throttle to see if the initial deadband could be adjusted (no adjustment was done). After the incident I returned to the dealer and they said they have never heard of this problem, there are no recalls or tsbs, and the ECM would not datalog anything since there was no trouble light. They said there was nothing they could do. I consider this unsatisfactory, deem it a major safety defect and Ford should be required to correct this immediately. A quick search reveals I am not the only one who has experience this.

- Mossyrock, WA, USA

problem #1

May 222013

Grand Marquis 8-cyl

  • 86,000 miles
I was driving on the interstate going about 65 mph. I accelerated rapidly to pass a semi when I was getting close to my exit. After passing the semi I let my foot off of the accelerator but the vehicle did not slow down. I applied the brake pedal but the vehicle kept accelerating for about 5 seconds. After that I heard an audible "clunk" come from the engine compartment and the vehicle returned to normal operation. This is the second time this has happened the first was a month ago accelerating rapidly from a stand still position. In neither case did I wreck or get a speeding ticket.

- Lebanon, IN, USA

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