Complaint / review text:
We own a 2003 Ford Expedition with a 5.4L, V-8 Triton engine. While driving we heard a loud bang and then it sounded like the engine was back firing. We smelled gas and a burning smell. We took our expedition into the Ford dealership and were informed that #7 spark plug had blown out of the head, stripping the threads. The estimated cost to repair was $3,500. To replace the head. We had previously taken this Expedition into Ford at 72,723 miles because the engine lacked power and surged. We were told that the #7 spark plug needed to be replaced (prior to the 100,000 Ford recommended time for a tune up). We had all of our spark plugs changed and a tune up done at that time.
We have taken our vehicle to many different mechanics and have been told that this is a wide spread problem with the aluminum heads. We paid a different mechanic shop $328.95 to tap and rethread the spark plug hole using Helicoil. A month later we had another problem with the #7 spark plug and we're informed that we need a new engine now. We paid $745.73 to have a permanent thread repair insert put into #7 cylinder which did not fix the problem. The vehicle now has low compression in #7 cylinder, plus a possible burnt valve and/or bad piston. We were informed that we now need a new engine at an estimated cost of $6,000.00.