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1999 Mercury Grand Marquis problems

The most common problem on the 1999 Mercury Grand Marquis is engine and cooling, typically around 103,000 miles. It has 1.7 times the complaints of a typical Grand Marquis model year.

Typical year1.7x the typical complaints
Owner complaints
164
Recalls
3
Service bulletins
138
Worst area
Engine
Fuel economy
18mpg

The worst 1999 Mercury Grand Marquis problems

Ranked by number of owner complaints. Mileage and cost come from what owners wrote.

Problems by type

Tap a problem to see which part fails, at what mileage and in which other years.

Specific symptoms reported on the 1999 Mercury Grand Marquis

Headlights 17Ball joint 8Stalling 7Pulling 7Tire blowout 6Check engine light 5Overheating 5

Recalls 3

Equipment: mechanical: integrated jack/leveler/stabilizerReported July 18, 2000 · 875,000 vehicles affected
What is wrong
Vehicle description: passenger vehicles. These vehicles have jacking instructions which, if followed, could cause the vehicle operator to place the jack on a frame weld when attempting to raise a rear wheel. If the vehicle is jacked up with the jack placed on the frame weld and if the vehicle is free to roll (wheels not blocked or chocked), the jack could yield and the vehicle may drop suddenly.
Risk
If this occurs and any portion of the operator's body is under the vehicle, the potential for personal injury exists.
Remedy
Owners will be provided with a revised jack instruction and stowage card and jack warning label, as well as a supplement to the owner guide.

Recall number 00V200000 · Recall details

Seat belts: front: anchorageReported June 12, 2000 · 1,167 vehicles affected
What is wrong
Vehicle description: passenger vehicles using aftermarket driver's seat belt assemblies that were sold by ford parts departments from january 1, through june 13, 2000. These seat belt assemblies fail to comply with the requirements of fmvss no. 209, "seat belt assemblies." the equipment involved is service stock seat belt assemblies, model nos. H 9977, h 9979, t 9063, and t 9217, built by trw vehicle safety systems, inc. (trw) manufactured from june 1, 1998 through may 21, 2000. Some of these seat belt assemblies may have been installed as service replacement equipment on the vehicles involved in the recall.
Risk
In the event of a collision, these seat belts may not restrain an occupant increasing the risk of injury.
Remedy
Dealers will inspect these vehicles and replace the service seat belt assemblies that were installed in these vehicles from january 1 through june 13, 2000.

Recall number 00V157001 · Recall details

Seat belts: front: anchorageReported June 12, 2000 · 1,129 vehicles affected
What is wrong
Vehicle description: passenger vehicles using aftermarket front passenger side seat belt assemblies that were sold by ford parts departments from january 1, through june 13, 2000. These seat belt assemblies fail to comply with the requirements of fmvss no. 209, "seat belt assemblies." the equipment involved is service stock seat belt assemblies, model nos. H 9977, h 9979, t 9063, and t 9217, built by trw vehicle safety systems, inc. (trw) manufactured from june 1, 1998 through may 21, 2000. Some of these seat belt assemblies may have been installed as service replacement equipment on the vehicles involved in the recall.
Risk
In the event of a collision, these seat belts may not restrain an occupant increasing the risk of injury.
Remedy
Dealers will inspect these vehicles and replace the service seat belt assemblies that were installed in these vehicles from january 1 through june 13, 2000.

Recall number 00V157002 · Recall details

See all 3 recalls for the 1999 Mercury Grand Marquis

Defect investigations

Spark plug ejection from cylinder headOpened September 22, 2005, closed January 4, 2006

On september 6, 2005, odi received a petition requesting that the agency investigate allegations of engine spark plug ejection in certain model year 1997 through 2004 ford vehicles with triton v-8 and v-10 engines.odi received a total of 474 non-duplicative complaints on the subject vehicles where the complainant, or the dealer repairing the vehicle, reported that a spark plug detached from the cylinder and/or ejected from the engine.as of december 8, 2005, odi is not aware of any allegations where the alleged defect resulted in a loss of vehicle control, a crash, an injury, or a fatality in any of the 10,319,810 subject vehicles.in addition, odi is aware of only two incidents where the vehicle stalled without restart.information contained in the odi consumer complaints and obtained from 72 telephone interviews with complainants showed the following:(1) 99% of the complaints were on my 1997 to 2002 subject vehicles.(2) most the complainants reported hearing a loud pop while driving or upon starting up the vehicle followed by a loud, repetitive clicking or popping sound.(3) many of the complainants reported that the popping sound was accompanied by some loss of vehicle power; however, in 99% of the incidents reported, the vehicle did not stall.in the very few incidents where the vehicle did stall, most vehicles could be restarted.(4) only a small percentage of the complainants cited that they smelled gas or a slight burning smell when the incident occurred.(5) in all but a very few incidents, vehicle damage was limited to the engine.in one incident, the complaint reported that the fuel rail was damaged and replaced after one of the spark plugs ejected from the engine; however, the complainant reported that the damage did not result in any type of fuel leak or fire.in another incident, the only incident where a fire was alleged, the complainant reported that no fluid leak was observed, but that a fire resulted after the spark plug had ejected from the engine and he had restarted the vehicle and driven to another location.none of the complainants reported any damage to the vehicle hood.(6) only two complainants reported that they observed what appeared to be some drops of fuel coming from the cylinder where the spark plug had failed or on the spark plug itself; however, each of these complainants reported that there was no smoke or flames as a result of his incident.as the petitioner noted, and odi?s analysis showed, it is possible for a spark plug to detach from the engine cylinder threads in the subject vehicles.however, odi?s analysis of 474 complaints describing such incidents found only a very few alleged any safety-related consequences.none of these showed any evidence of a serious safety consequence.given the large population and relatively long exposure time of the subject vehicles, the complaint analysis indicates that the risk to motor vehicle safety from the alleged defect is very low.in view of the foregoing, it is unlikely that the federal safety agency would issue an order for the notification and remedy of the alleged defect at the conclusion of the investigation requested in the petition.therefore, in view of the need to allocate and prioritize the federal safety agency?s limited resources to best accomplish the agency?s safety mission, the petition is denied.

DP05005

Fuel-fed firesOpened August 22, 2002, closed December 4, 2002

The fars data shows that the risk of fire from impact in all directions in the subject vehicles is the same as all other sedans.the subject vehicles are not over represented with respect to the risk of fire in real-world high-energy crashes.a further discussion of issues related to post crash fires in the subject vehicles is set out in the closing report for sq 01-014 and that report is in the docket for this petition.after reviewing the petition and its supporting materials, as well as information furnished by ford and gm, and information within the agency's possession from previous investigations and other related actions,the federal safety agency has concluded that futher investigation concerning post-crash fires in the subject vehicles is not likely to lead to a decision that the vehicles contain a safety defect.

DP02007

Post rear end collision firesOpened November 27, 2001, closed October 3, 2002

There is no summary currently available

SQ01014

Technical service bulletins for the 1999 Mercury Grand Marquis 138

Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.

See all 138 bulletins for the 1999 Mercury Grand Marquis

1999 Mercury Grand Marquis fuel economy

Official EPA estimates in miles per gallon (MPGe for electric). Ranges cover trims that share the same engine.

EngineDriveCityHighwayCombined
4.6L 8‑cylRWD152218

What 1999 Mercury Grand Marquis owners say

Most recent owner complaints, unedited.

Filed Jul 13, 2023 · Seat belts · MS · crash

My significant other and I were in an accident on the interstate. The airbags deployed and the seat belts failed to lock in place.

Filed Jan 25, 2022 · Engine · 120,000 miles · FL

The contact owns a 1999 Mercury Grand Marquis. The contact stated that the vehicle had a leaking intake manifold. The vehicle was taken to an independent mechanic and diagnosed that the intake manifold needed to be replaced. The vehicle was not repaired. The dealer and manufacturer were made aware of the failure but informed the contact that there was no recall associated with the VIN. The failure mileage was approximately 120,000.

Filed Jul 18, 2020 · Lights · 160,000 miles · SC

My headlights, hazards, and turn signals all just randomly went out while driving. They have not come back on since. After reading forums I believe it to be the lcm but my year model is not included in the recall. I believe this issue dates back farther than 2000 and ford should step up and recall more of these lcm components.

Filed Nov 8, 2019 · Steering · 154,850 miles · WI

While driving pins in steering coulm became losse and caused car to shut off while at stop light had to tow to service shop; had found common ford issue with loose steering pins in 1999 mercury grand marquis should be recall very dangerous to happen to some cast is $300 plus tax and tow I feel ford ouwes me to this that built this car not me its cost as much as a decent used car to day I would like ford to offfer me help; with there past issues with cars

Filed Apr 10, 2019 · Engine · 112,004 miles · OH

On the 1999 mercury grand marquis ls 4.6 l v8 the original plastic intake manifold cracked and busted wide open causing all the coolant / antifreeze to pour out. From what I gather there was a recall on this years ago and they made a different intake manifold which was aluminum for the part that the thermostat goes into and the rest of it was plastic. If this isn't caught in time and all the fluid leaks out it will completely destroying your engine also. Mine cracked while it was in park just running.

Filed Aug 30, 2018 · Lights · 160,000 miles · CA

Tl* the contact owns a 1999 mercury grand marquis. While driving 65 MPH, the headlights failed to operate intermittently. The contact stated that the vehicle exhibited the same symptoms as listed in the federal safety agency campaign number: 15v861000 (exterior lighting). The vehicle was not taken to a dealer to be diagnosed or repaired. The manufacturer was notified and did not assist. The failure mileage was approximately 160,000.

Filed Jun 18, 2018 · Electrical, Lights · 155,000 miles · OH

Vehicle was parked. I went to turn my headlights on. No headlights, turn signals, dash lights, hazard flashers or dome light. The 2003-2005 models were recalled for this same thing with the lcm failing. Please look into this as this is a serious safety issue.

Filed Jan 5, 2018 · Engine · 135,000 miles · MI

Tl* the contact owns a 1999 mercury grand marquis. While the vehicle was parked with the engine running, the contact shifted into reverse and noticed steam coming from the hood. The vehicle was then shifted back into park and turned off the engine. Upon opening the hood, the contact noticed that a part of the manifold was missing the thermostat. The contact was unsure of any warning indicators illuminating. The contact went to bill macdonald ford (1200 s carney dr, st clair, mi 48079, (810) 329-6601) and was informed there were no recalls. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the issue. The failure mileage was approximately 135,000.

Filed Oct 2, 2017 · Lights · 160,000 miles · MI

We own three mercury grand marquis, love the cars however all three( 2000, 1999 and second 1999 all intemitantly loose headlights when high beams are on. If I quickly go to low beams I can see again...its like they are overheating with the amp draw of high beams and circuit breaks. This is way too common to be ok. It dangerous especially if one gets rattled with complete darkness at night and high speed. Bumps also seam to slightly affect it sometimes. This happens any time the gray 99 has high beams on for about 45mins. Only 10-15mins on blue 1999 and 2000 not as frequent yet but only has about 75k miles, where as the 1999 are 150-210 respectively. Started 5 years ago on my first and I just did not use high beam since I purchase second 1999 to replace first and had title issues so bought the 3rd 2000 and found they all have the same flaw!! My cell [xxx]. Information redacted pursuant to the freedom of information act (foia), 5 u.s.c. 552(b)(6).

Filed Aug 24, 2017 · Lights · 134,000 miles · OH

Tl* the contact owns a 1999 mercury grand marquis. While driving approximately 45 MPH, the headlights suddenly began to flicker off and on. The vehicle was taken to an independent mechanic who diagnosed that the light control module was faulty and needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure, but no assistance was offered. The local dealer was not notified. The failure mileage was 134,000.

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Other model years

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Questions about the 1999 Mercury Grand Marquis

Is the 1999 Mercury Grand Marquis reliable?

Owners have filed 164 complaints about the 1999 Mercury Grand Marquis, 1.7 times a typical Grand Marquis model year.

What is the most common problem with the 1999 Mercury Grand Marquis?

Engine and cooling, with 33 complaints, typically around 103,000 miles. Next is lights (21).

How many recalls does the 1999 Mercury Grand Marquis have?

3 recalls, covering equipment and seat belts.

What year does the Mercury Grand Marquis have bad engine?

The Mercury Grand Marquis model years with the most engine complaints are 1997 (126 complaints), 1996 (86 complaints) and 1999 (33 complaints).

What gas mileage does the 1999 Mercury Grand Marquis get?

Official estimates for the 1999 Mercury Grand Marquis range from 18 mpg combined. The most efficient version (4.6L 8-cyl, RWD) gets 15 city and 22 highway.

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