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My check engine light was on because my buddie hooked up a wire to a solenoid wrong--hard to notice under the intake manifold in the front on the right. The APG (? on name) was not hooked up as a result so the check engine light came back on steady. A code was returned after hooking it back up and pointed us to the problem. The end solution was indeed to replace the heater hose over the #4 cylinder coil, the coil (COP), and the vacuum hose assembly that had two leaks. Yay!
I replaced 4 cops and 4 plugs, trouble went away, now I'm going to use #1 on passanger side to find exactly which if any of the coils are bad by changing them out until the problem comes back.
them coils...
Smithd how did you do a amp test on a cop, i piulled all eight cop's on my 2002 expedtion today and did resistance readings on them reading .7 to .8 on primary and 5.3k to 5.4k on the secondary.
You need to get it on a big time analyzer check it. No other way that I know of - and it was so long ago I don't remember the exact procedure my buddy used once he got it on the analyzer. I know the plug and cop closest to the passenger seat was the problem. Fortunatly, my buddy has a garage shop and an analyzer, and does not charge unless he fixes the problem. Most places will charge you just to put it on an analyzer - so you might just want to go forward with the fix (cop, hose/wire, and plug). If you are real lucky you might find a parts store near you that will give you a complimentary hook up - but it sounds like you have some sort of gizmo already. Good luck!
thanks smithd, i just wanted to go through everything that i can do before i have to take it to someone else, I do not realize that the post that put on the tail end of a post that ended in 9-03, one again thank you, basically i ust used a volt ohm meter to measure the resistance of the primary and the secondary of the cop,