Three problems related to loud engine noise have been reported for the 1998 Ford Expedition. The most recently reported issues are listed below.
While I was diving around 35 mph to 45 mph a horrible violent shake starts to occur. And is very difficult to accelerate especially once you hit the freeway very unsafe to drive at such speeds. It starts with a violent shake with loud noises coming from the exhaust. It has blown 2 coils already.
I was driving my 98 Expedition through our cul-DE-sac when we heard a loud noise from the engine compartment. My wife and I had to push the truck back to our driveway and immediately began to check the spark plugs. (I am a mechanic by trade) we soon discovered that it was the #3 spark plug. It had blown out, stripping all threads. Ford is no help at all. They want $4000 to replace the heads, (and claim to have no knowledge of this defect)but can't guarantee that this won't happen again. Since yesterday,I've discovered that I'm one of the many thousands who've had this problem. When is someone going to step up and take responsibility?.
Contact stated while wife was driving a 1998 Ford Expedition a spark plug blew out from engine. The consumer states wife heard a loud noise coming from the engine and the vehicle kept running, but it lost power and was misfiring. A certified mechanic stated the number four spark blew out on the passenger side due to a defective cylinder head. And stated there is not enough thread on the block to hold the spark plug in. The consumer states this has never happened to his vehicle before. The vehicle has now been repaired by having metal jackets put into the cylinders and also had the cylinders rethreaded. The service dealer stated it would cost approximately $2,000 to repair the vehicle.