We picked up our " NEW " 1998 EX XLT SOHV 165KM on Friday, and the first thing I did on Tuesday after changing the air filter to a K&N was check the plugs, even though I was more then happy with the way it was running. As I suspected, the plugs were the origional Motorcraft, quite rusty around the outside, and about a 1/4 inch gap for the spark. The two I could get to were quite clean though. I lucked out finding a great shop close to where I got the truck. The place I got the truck turned out to be a place with a bunch of liers for saleman, but that is how I found this place.
In my past 98 EX I changed the plugs and wires at 165,000 as well, and put in Bosch Platanum and Motorcraft wires. Even at 230,000km, I still got 21 to 22 mpg hwy/city constantly, and ran great being a OHV engine. With this new truck, I checked the milage twice before changing air filter and plugs. I got 17.5 mpg the first fillup, and only 15 mpg the second fillup. Must add though, it has been -20 c here the last week. Where I took the truck for the tuneup, They suggested a brand new AC Delco line of Plananum and Delco wires for me to try. They said that they have been compared quite favorably to Bosch, and better then Motorcraft. They said to try for a month or so, and let them know. If I am not happy, they will put in whatever I want.
Just waiting for it to warm up so I can get an accurate assessment.
Paul