2008 Mercury Grand Marquis Engine Problems
- Complaints
- 4about this part
- Share
- 5%of 80 total for the year
- Median mileage
- 65,575miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 4 complaints about the engine of the 2008 Mercury Grand Marquis, 5% of the 80 complaints for this model year. Where a mileage was given, the median is 65,575 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“While driving up a short moderate grade, the car engine shut off. The battery (nearly new) was fine and the dashboard lights were displayed with icons lit. The steering was affected and the car drifted to a stop on a level surface. I was successful in restarting the car on the first try and this incident has not recurred. I did not make note of what the dashboard lights were, as I was more interested in restarting the car. I do have a rather heavy key set (heavier than most).”
NHTSA complaint #10575520, filed 2014-03, 9,587 miles“Vehicle was purchased used in june, 2011. While braking for a stop light, vehicle suddenly accelerated. Had to forcefully pump brakes to stop vehicle from hitting vehicle in front. Car returned to normal operation as soon as I got it stopped. Have had similar incidents a couple of times before, although not as bad as this one, however, at that time I thought maybe I had accidentally pressed the accelerator while braking. I know that was not the case this time.”
NHTSA complaint #10535491, filed 2013-08, 56,150 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. …”
NHTSA complaint #10861624, filed 2016-04, 75,000 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.”
NHTSA complaint #10513530, filed 2013-05, 86,000 milesRelated service bulletins
- 10166447Sep 18, 2019This SKU is a Radiator Fan. The customer communication requested return of unsold inventory to inspect the electrical connections. An electrical connection issue may lead to the…
- 10109070Sep 21, 2016The Powertrain Control/Emissions Diagnosis (PC/ED) manual has been revised for diagnosing electronic throttle bodies (ETBs). The ETC_ACT and ETC_DSD PIDs should not used to…
- 10045340Jul 10, 2012Ford/lincoln/mercury: if battery was disconnected or dead, vehicles/trucks may experience hard starts and engine idle rpm fluctuation and exhibit diagnostic trouble codes (dtcs)…
Engine: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2010 | 1 | 4% |
| 2009 | 2 | 8% |
| 2008 | 4 | 5% |
| 2007 | 4 | 4% |
| 2006 | 8 | 6% |
| 2005 | 5 | 1% |
| 2004 | 4 | 1% |
| 2003 | 5 | 1% |
| 2002 | 2 | 3% |
| 2001 | 9 | 6% |
| 2000 | 8 | 5% |
| 1999 | 7 | 4% |
| 1998 | 3 | 2% |
| 1997 | 2 | 1% |
| 1996 | 1 | 0% |
| 1994 | 1 | 1% |
| 1990 | 1 | 2% |
| 1985 | 1 | 5% |
Other parts of the 2008 Mercury Grand Marquis
23 complaintsVehicle speed control
15 complaintsBrakes
10 complaintsElectrical system
9 complaintsBody and structure
9 complaintsEngine cooling
5 complaintsExterior lighting
5 complaintsFuel system
4 complaintsAir bags
3 complaintsEquipment
3 complaintsOther or unknown
3 complaintsSeat belts
3 complaints
← All problems reported for the 2008 Mercury Grand Marquis
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology