I just jointed this forum so I could say thanks to Otto457 for putting this thread up. I successfully completed the job yesterday and found this guide very useful to have handy during the job.
I'm the original owner of a '99 Expedition with 114,000 miles on it. I was stunned at how much local shops wanted to change the plugs. The lowest deal I could find was $600 plus a $60 (or was it $80?) per broken plug contingency, and I could tell by the twinkling in their eye they were going to break some. No one would quote a flat job rate. All of them cited notorious broken plug issues.
After a bit of internet research, I became convinced I'd be fine since I do not have the later model 3 valve with the bigger broken plug problems, plus all my clean living had to pay off somewhere. I ordered the plugs plus some new coils. When it came time to do the job I looked around again for some of the how to info to have it handy in the garage, but couldn't find what I saw earlier. This thread came up, new to me, and it was great.
- 5 1/2 hours from hood open to hood close. Took my time. Gained confidence with #1 and #5.
- Sticky bolt on steering pump bracket, wouldn't come off with 12pt socket or vice grips despite WD40 and penetrating oil. I finally remembered I had a 6pt socket and that did the trick.
- The toughest plug for me was #7, and I had to take the fuel rail off to get to it. That helped on #8, too. I didn't bother with the rail on the passenger side.
- The tip I saw here
to use a wrench for the #8 COP bolt rather than a socket was helpful. I probably would have screwed around for longer with a socket fail if I hadn't seen that.
- I used a little penetrating oil on each plug and a ~10 minute soak. I'm not sure if it mattered but I'm glad I didn't find out the opposite. It was 8 pleasant surprises seeing the socket come up each time with the whole plug on the end, all the way down to its little worn out electrode.
I easily convinced myself on a test drive that it's much peppier. We'll see how the mileage goes, but I don't see how new plugs, coils, and a clean MAF sensor can hurt.