My 2003 lincoln navigator ultimate @ 84,000 miles blew 2 spark plugs through the aluminum head of the 5.4 liter triton engine. It is my understanding that this aluminum head has been redesigned by ford and that there is also an after-market fix to this increasing problem that re-threads the spark plugs, but that said fix also gets forced through said inadequately engineered aluminum head. For refuses to pay for the replacement of said head and said repair is estimated in the thousands of dollars. I replaced the melted coil and barely was able to thread new plugs into place, but I am concerned about being stranded somewhere in my car. I think that ford should have to recall all of these engines and replace the old heads with new, better engineered heads.
2003 Lincoln Navigator engine complaints
Page 2 of 2: complaints 11 to 14 of 14, newest first, as owners wrote them.
While driving 70 MPH the vehicle would suddenly shut down. This problem has occurred four times. *nm the vehicle would lose power steering and power brakes. The service dealer tried various fixes but the problem remained the same. *sc
While driving vehicle stalled four times on the highway. Also, vehicle had problems with getting the gear out of park. Contacted the dealer. The problem recurred.
Without warning the vehicle stalled while the consumer was driving at an undetermined speed. The consumer contacted the dealer on four separate occasions and the problem still continued. *ak when idling the vehicle made a pressure like noise that would get louder, the low oil indicator light would come on, the valves had a tapping sound that was abnormal, there was a metal scraping sound which as if the bottom was going to drop out, there were exhaust noises along with a popping sound, and there was continuous stalling. *sc the consumer stated there was an ongoing dispute regarding the odometer reading. Also the brakes and door locked never worked.
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