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.
1999 Mercury Grand Marquis engine problems
33 complaints (20% of all complaints for this car). Typical mileage when it fails: 103,000.
- owner complaints
- 33
- of this car's complaints
- 20%
- typical mileage
- 103,000
- crashes
- 0
- recalls
- 0
Which part fails
- Exhaust system: manifold/header/muffler/tail pipe7
- Engine5
- Engine: gasoline2
- Cooling system2
At what mileage
Complaints by mileage at the time of the problem.
0k-25k
25k-50k
50k-75k
75k-100k
100k-125k
125k-150k
150k-175k
175k-200k
200k+
Mercury Grand Marquis engine problems in other years
Specific symptoms reported on the 1999 Mercury Grand Marquis engine
Phrases found in the owners' own descriptions, so one complaint can mention several symptoms.
Related recalls
No recalls on record for this model year.
Related investigations
Spark plug ejection from cylinder head
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
What 1999 Mercury Grand Marquis owners say
Most recent owner complaints, unedited.
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.
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.
Plastic intake manifold failed, antifreeze leaking from around thermostat due to this failure and leaking into coil packs and causing major misfire in motor. Happened suddenly, no indication of leak prior to this failure. Was driving when this happened and had to call for help to get vehicle back home, and now can't drive it . Cost to fix is expensive, and the car ran great until this happened. Sounded like I has thrown a rod, popping louder on exceleration, so I immediately parked it and turned off the motor.
Intake manifold failed (burned and disintegrated in the area of the thermostat ) and had to be replaced at considerable expense . Presently the speedometer fails intermittently dropping to zero at random moments. Most importantly the lights cut out intermittently usually when the heat is on and on longer trips. Also, most times it has happened when it has been raining and colder. Drove upwards of 40 miles with the headlights cutting out intermittently in the rain and cold, problem has continued to recur but seems to be related possibly to having the heat on. I believe the lighting control module is located near a heating outlet and may be suffering a failure as a result but this is just speculation. Also, previously when I had pulled into a rest area for awhile, after cooling down, the problem went away for a little while then resumed after about ten miles with the heat on. I believe it is being caused by the excessive heat the lcm is subjected to by virtue of the area in which it is installed. The lighting control module is of motorola manufacture with siemans relays inside. The part has numerous numbers on it , most prominently: xw7t-13c788-aa , 6mx2794a01, 990429a, and lighting control 95m .others online with similar vehicles (crown victorias) and of other model years manufactured by ford have reported similar problems and that replacing the relays has resolved the issue. I do not know that this part is the source of the problem but suspect it as many others online have reported that this part was the source of their problems.
My car was in drive at a business traffic intersection drive way on a slight hill with the brakes on when the engine surged and the car started to reverse while still in drive. I had to put considerable pressure on the brakes to stop it. I checked and the shift lever was still in drive. My car has been properly maintained and was recently serviced with all required services done. This really scared me and I would have crashed into a car if it was behind me. Ford should look into this safety problem.
Driving on the hwy and the car started to overheat with hot steam shooting out from the engine and it also had a strong coolant smell. The car could not be driven until l it had $1,500 in repairs for a known, leaking plastic manifold issue. This failed part cracks and leaks into the hot engine area. And, ford had redesigned the failed part. Additionally, ford had once offered free fixes for a few months for police cars and taxi cabs with the same engines under a class action law suit but didn't tell the owners about. Thousands of consumers were ripped off because ford should have fixed this issue under the class action recall. But they didn't bother notify anyone about the three month recall window. In checking the federal safety agency records, there are thousands of us with the same reported problem. Please take some corrective action for us.
Tl* the contact owns a 1999 mercury grand marquis. The contact stated that water was leaking from under the vehicle. The vehicle was taken to an independent mechanic for diagnosis where the contact was advised that the intake manifold would have to be replaced because it was fractured. The manufacturer was made aware of the failure. The vehicle was not repaired. The approximate failure mileage was 114,000.
Plastic intake manifold on 4.6 liter engine found to be cracked and leaking coolant. The loss of coolant results in the vehicle becoming disabled and/or unsafe to drive. Leaking coolant is also toxic to children and animals, as they are more likely to be in contact with coolant on the ground or garage floor. This defective part (plastic intake manifold) was identified by ford motor company as defective and quietly settled in a class action lawsuit. Replacement parts have been redesigned. However, ford did not contact customers with this model car to notify them of the defective part or to offer resolution. Earlier models of this engine (and all other engines) used a metal intake manifold. These were not problematic. Intake manifolds are not a moving part of the vehicle engine, and are not subject to ware. The plastic material used in the problem manifolds are not able to withstand the normal temperature fluctuations of a vehicle engine and are therefore prone to failure. Ford has been contacted in an attempt to resolve this issue, but the company has declined to offer any resolution whatsoever.
Tl* the contact owns a 1999 mercury grand marquis. The contact stated that the vehicle would stall sporadically and without warning. A local mechanic diagnosed that the intake manifold would need to be replaced. The dealer was contacted, but denied any assistance with repairs to the defect. The manufacturer was not made aware of the failure and the vehicle was not repaired. The failure mileage was 90,200 and the current mileage was 91,000.
Questions about the 1999 Mercury Grand Marquis engine
Does the 1999 Mercury Grand Marquis have engine problems?
Owners have filed 33 complaints about the engine of the 1999 Mercury Grand Marquis, 20% of all its complaints, more than any other problem.
At what mileage do 1999 Mercury Grand Marquis engine problems start?
The typical (median) mileage in owner complaints is 103,000 miles.
Was there a recall on the 1999 Mercury Grand Marquis engine?
There is no recall for this problem on this model year.
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).
Other 1999 Mercury Grand Marquis problems
Lights 21Suspension 18Steering 16Electrical 15Acceleration 12Tires 12Transmission 12Brakes 9Body 7Seat belts 7Fuel system 6Visibility 6Airbags 5Locks 3Seats 2Wheels 2
VIN decoder
See the problems and recalls for an exact car
Buying a used 1999 Mercury Grand Marquis?
Check the exact car before you pay: accidents, salvage or flood titles, odometer readings and previous owners.
Check its history