It is a 5.4L issue, though it mostly happens on boosted trucks. The 4.6L has a few more threads in the heads for the plugs. Be careful tightning them though because they will still strip. The 4.6L is an excellent engine. It can last for a long time if maintained propperly. It is not extremely powerful and is really suited better in a car. Keep the plugs changed and check the coil boots/springs every time you change the plugs. The trucks have aluminum intakes, so they do not have the coolant leak issues that the PRE-PI car engines had.The truck has a 4.6 in it, I heard of the spark plug holes being more of a problem on the 5.4 engines than anything.
think I'm just going to stay away from an expedition altogether, I don't want to have to deal with that spark plug bullshit.Stay away from the rear air ride,they are prone to fail. There are also issues with the rear ac/heat sometimes from what I've read. They are big heavy trucks so don't expect any mileage over 16. There's an entire forum dedicated to them so check it out. I looked into getting one but will probably get a 95-96 bronco as its smaller and comes with the good ole 351
Do what ya gotta do, but all cars/trucks have bullshit to deal with... What folks are saying is that it's really not that big a deal, and for the most part the things are pretty solid. I've done blown out plugs on a couple of 5.4's back in my dealership days. It's a prick, but not impossible by any stretch of the imagination. 4.6's were not prone to those issues.think I'm just going to stay away from an expedition altogether, I don't want to have to deal with that spark plug bullshit.
Just go back to my hunt for a crew cab powerstroke that hasn't been douched out.
Thanks for the input guys.