Originally Posted by euroclydon
I changed all the plugs on mine. It was a pain! Still having missfire problems in 1 6 and 7. Any ideas why all three would go out like that. I know its not the plugs now, but it could be those lousey coil-plug things. Could 3 go out at once (its a pain to even pull them off to check each individually)? Or is it likely something else?
My miss started last winter about once a week accelerating at 45 mph. Eventually started missing at red light. Recently would miss after driving about 2 miles and miss would go away and come back and go away. I finally took it in and the computer analyzer found the #3 spark plug coil to be bad and they replaced it. They found the plugs fouled pretty bad and suggested changing the plugs. After that - the engine was missing worse. Now, found #8 coil bad. The engine is ok now but $$$ 730.00 - coils $131 each, double platinum plugs $85 the set plus labor - I am retired and that just knocked a hole in my bank account. I looked at JC Whitney and they had the spark plug coils for $59.99 each.
My question now is: What about the remainding 6 coils? Are they apt to go bad with the new plugs or they apt to not go bad? - I should mention I have a 2000 5.4 liter 4wd with 69,000 miles - well, Ford says change plugs at 100,000 miles - I would think the coils went bad because of the fouled plugs.?? One other thing - I also had the water problem - water sitting in there where the plugs are - rust stains on the rubber covering part of the spark plug coil.
I am thinking or I should say hoping these remaining coils will not go since I have new plugs. What do you people think? Or the other way around - they will go bad with the new plugs.
thanks - Jerry