Eight problems related to engine and engine cooling have been reported for the 1999 Lincoln Navigator. The most recently reported issues are listed below.
It blows the spark plugs out while driving on normal streets in September or October 2019 the shop I took it to be repaired told me that happens alot with this vehicle.
The contact owns a 1999 Lincoln Navigator. The contact stated that the vehicle caught on fire while parked with the engine off. The dealer was contacted in regards to the failure but denied any assistance with repairs. The manufacturer was not contacted and the vehicle was not repaired. The failure and current mileage was 99,000. The VIN was not available.
Water, vapor, condensation keeps getting on to the coil on plug assembly on the passenger side of my engine causing water build up, electrical failure, misfires and spark plug explosions in to my engine, causing fragments of metal and plastic to fire in to my engine. This has happened to me several times now, been repaired, and continues to happen. Despite 6 separate technical service bulletins, Ford / Lincoln have not recalled this problem with the 1999 to 2006 5. 4l v8 engine, leading to thousands of people like me having to continually fix this problem, which is caused by a design / safety flaw in the engine / component construction. I was nearly killed today on the freeway because the truck hesitated and misfired while I was going up a large hill, stuck between two semi-trucks and I couldn't move out of the way due to failure to accelerate.
1999 Lincoln Navigator-spark plug blow out.
The contact owns a 1999 Lincoln Navigator. The contact stated that the sparks plugs were becoming overheated and popping out from under the hood, and were also burning the attached coil. In addition, the contact stated that the suspension would intermittently fail and would not inflate. The contact would shut off the vehicle for a few moments to allow the suspension to reset itself. The vehicle was neither inspected for the failure nor repaired. The failure mileage was 220,000 and the current mileage was 240,000.
The contact owns a 1999 Lincoln Navigator. While proceeding to enter the vehicle, the contact noticed flames coming from the passenger side of the hood. She was unable to extinguish the fire and called the fire department. The fire department extinguished the flames and filed a report. There were no failures prior to this incident. The contact called her insurance company to file a claim and was informed that an insurance adjuster would inspect the vehicle. The cause of the failure was undetermined. The contact is in the process of notifying the manufacturer. The failure mileage was 190,000.
The contact owns a 1999 Lincoln Navigator. After driving and parking the vehicle, it exploded. The contact noticed black smoke and a fireball, and then the windows blew out. The police officer stated that the origin of the failure could never be determined because everything was burned to the ground, including the transmission and engine. It was noticed, however, that the fire seemed to have started from the front end. Before she exited the vehicle, the contact did not notice any warning lights or signs of overheating prior to the malfunction. A police report was filed. She consulted the manufacturer and was advised to call back. The current and failure mileages were approximately 140,000.
My 1999 Lincoln Navigator (VIN 5lmpu28l0xlj10870) with 5. 4l a engine with 80,000 miles. The spark plug blew out while driving on the highway. The head had to be replaced. The mechanic said that he recently had a number of customers with similar problems and thought the problem was due to a faulty design which utilized too few threads on an aluminum head.