Two problems related to engine stall have been reported for the 1998 Ford Expedition. The most recently reported issues are listed below.
1998 Ford Expedition 5. 4l v8 engine, spark plug from cylinder#3 blew out of head causing damage to cylinder head and ignition coil. Cleaned out threads with tap of same size, which are impossible to see in tight area of engine compartment and installed new spark plug but it blew out again two days later.
: the contact stated while driving 35 mph a spark plug blew out of the cylinder head due to the thread holding the spark plug into place and the engine stalled. The vehicle was taken to the dealership for inspection. Upon inspection, the dealership put a heli coil in the cylinder head and replaced the spark plug, which remedied the problem. Updated 3/9/2006 - the first failure occurred at 48000 miles on the #2 cylinder. The plug was blown out of the cylinder head. The latest failure was on the #7 plug.