Two problems related to gas recirculation valve (egr valve) have been reported for the 1999 Ford Expedition. The most recently reported issues are listed below.
I have a v8 triton 5. 4l which has blown a spark plug from the engine block. I was not putting undo stress or wear and tear on my engine when this occurred. I kept maintenance up on my vehicle so therefore this should never have been an issue. There was no accident as I was able to pull over and out of the way of traffic but this could be potentially dangerous since fuels being expelled into the engine and a spark plug blowing out of the head leaving a gaping hole where the fuel is still being expelled and there is still a spark is very dangerous. I have researched this and so many other owners of the same vehicle have had this happen to them stranding people and worse. How is a manufacturer allow a design and integrity flaw like this go unnoticed or fixed.
On my recent purchase of a used 1999 Ford Expedition with the 4. 6l v8 engine, with low miles only approx 31,500 when purchased, and after only adding 12,000 more miles to the vechicle, in which we haven't had the car for a full year, we experienced a blown right side head gasket that I just recently found out was a known problem with this model. The car wasn't under warrenty and the cost for repairs ran up to 1300. 00 which is outragious. I feel that if Ford has known about this defect that Ford should have recalled this defect long before so many have needed repairs. I regret that this is the last Ford I will ever own, which is directly due to the inept customer service that Ford is now known for.