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3
Lean Misfire
Sorry for the confusion. I assumed you were asking if, when changing the C.O.P., you should also change the plug (not visa versa). I would expect the misfire is due to a bad C.O.P. Who is doing the work? I would expect a Ford dealership (or experienced Ford mechanic) would recommend...- 3rd7son
- Post #9
- Forum: 1st Gen Ford Expedition Engine & Performance
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3
Lean Misfire
If I recall corrrectly, they recommended changing the plug also (corroded due to mis-firing). If it's getting near your 60,000 mile tune-up you may want to change all of them right away. Good luck- 3rd7son
- Post #7
- Forum: 1st Gen Ford Expedition Engine & Performance
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3
Lean Misfire
Total cost was as follows: $65 for analayzer. $120 for COP. $7 for plug. $30 for labor. (all approximate). I have a buddy who could get a COP for around $60. The hard part is figuring out which cylinder. (Thus, the anaylzyer.) Looks like a front one (COP and plug) would be pretty...- 3rd7son
- Post #5
- Forum: 1st Gen Ford Expedition Engine & Performance
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3
Lean Misfire
I had similar problem for the last few months. Going up fairly steep inclines would cause sputtering/misfiring. Local Ford dealer connected and analyzer and drove it around. Identifed COP #8. Changed it (and spark plug). Now runs fine. Cost around $225. Good luck.- 3rd7son
- Post #3
- Forum: 1st Gen Ford Expedition Engine & Performance
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