Hi, I wanted to change the spark plugs on my Exp last weekend and I encounter a problem. The Explorer spark plugs are AWSF42PP. My dealership told me that they replaced this by the AGSF42FM spark plugs. When I tried to put that on they seem too big and I could only screw for about 3/4 turn. The bulge seem to be too big on the spark plug than the hole on the engine. The threads are ok but I can't screw that enough on. I remove all the dirt and rust all around as much as it was possible. Apparently the AWSF42PP is no longer available. The spark plugs that are on are the AWSF42PP but it look like the bulge have been modified to fit inside as well. Any idea??? Very confused... Regards
Mark