The car was built with a plastic intake manifold. The manifold began leaking at the thermostat housing and then the heater hose connection on the intake manifold suddenly broke. I now have to have the entire intake manifold replaced because of poor design and material selection. Ford knew of the problem but refuses to address the issue and hopes it will just go away. They should reimburse the owners of the vehicles for repairs that were due to poor design and materials used to make this part.
1999 Ford Mustang GT engine problems
22 complaints (61% of all complaints for this car). Typical mileage when it fails: 75,000.
- owner complaints
- 22
- of this car's complaints
- 61%
- typical mileage
- 75,000
- crashes
- 0
- recalls
- 0
Which part fails
- Engine10
- Exhaust system: manifold/header/muffler/tail pipe3
- Cooling system3
- Exhaust system1
- Engine: gasoline1
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+
Ford Mustang GT engine problems in other years
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 Ford Mustang GT owners say
Most recent owner complaints, unedited.
Spark plug blew out of an already fixed head!!!
Car lunges in drive or reverse before accelerator is deployed.
Hearing a exhaust leak like noise and around the spark plug there is air coming out of the heads causing them to eventually blow out and I will be very upset if ford don't replace it since it is happening to alot of cars!!!
Slowing down for a stop sign when the 3 rd spark plug blew out on the passenger side of my 1999 mustang gt with a 4.6 v8 . It also destroyed the coil on top of the plug.
I have experienced a spark plug blowout in my 1999 ford mustang with 4.6l v8. I have since read about the vulnerability of these engines to experience spark plug blowout. The first blowout was experienced prior to changing any spark plugs and therefore can not be deemed to be a cause of improper torquing, etc. A heli-coil was used to repair the spark plug blowout, only to have the spark plug blown out again at a later date. This time the cylinder heads were damaged and required replacement. The cylinder head replacement was a major inconvenience both in cost of repair, and in the severity of the malfunction. I am very disturbed to hear the number of complaints and number of other individuals who have experienced this same problem without any proper recognition or action by ford. I am filing this complaint to draw more attention to this issue and perhaps get some federal action against ford for this issue. I believe that owners like me should be compensated for the repairs done and the stress/inconvenience encountered due to this manufacturer defect.
1999 ford mustang gt appears to have crack in plastic intake system, and is losing coolant. Previously owned a 1997 mustang gt, and this was replaced under a recall. I can not find any info relating to the same problem with the 1999.
Tl*the contact owns a 1999 ford mustang gt. The contact detected a faint burning smell while driving the vehicle. Once the vehicle stopped, the smell intensified. The contact discovered that the manifold was leaking coolant. The dealer was notified and the contact is awaiting a response. The current mileage is 29,500 and failure mileage was 29,000.
There was a slight ticking noise coming from engine bay that I thought was an exhaust leak. Eventually the spark plug blew out of the head stripping the top threads out of the aluminum head. In order to fix the car, I had to have a local shop helicoil the head to add threads to the head.
Car was leaking coolant out of the thermostat housing. When I went to replace the thermostat and o-ring gasket, I discovered that the ledge that the o-ring sits on had broken off and fell into the intake manifold. The thermostat could not be put in correctly without coolant spilling everywhere. The only remedy was to replace a plastic intake manifold that costs 800+ dollars.
Questions about the 1999 Ford Mustang GT engine
Does the 1999 Ford Mustang GT have engine problems?
Owners have filed 22 complaints about the engine of the 1999 Ford Mustang GT, 61% of all its complaints, more than any other problem.
At what mileage do 1999 Ford Mustang GT engine problems start?
The typical (median) mileage in owner complaints is 75,000 miles.
Was there a recall on the 1999 Ford Mustang GT engine?
There is no recall for this problem on this model year.
What year does the Ford Mustang GT have bad engine?
The Ford Mustang GT model years with the most engine complaints are 1998 (44 complaints), 1996 (25 complaints) and 2000 (24 complaints).
Other 1999 Ford Mustang GT problems
Acceleration 4Airbags 2Electrical 2Seat belts 2Seats 2Transmission 2Suspension 1Tires 1Visibility 1
VIN decoder
See the problems and recalls for an exact car
Buying a used 1999 Ford Mustang GT?
Check the exact car before you pay: accidents, salvage or flood titles, odometer readings and previous owners.
Check its history