Originally Posted by Paralyzer
have you pulled any plugs yet? what brand are they? multiple times i have ran into missfire issues with aftermarket plugs. Sometimes people get away with it but I can tell you from experiance motorcrafts work best. Chech that out and make sure when re-installing the coils you put a dab of dielectric grease inside each coil. If you still have missfires after that I would replace those 2 coils and retest again.
When I swapped the plugs, I found most where motorcraft. I found two autolites out of the 8. I was told two of the cylinders have been helicoiled a while ago, so my guess is the cylinders with autolites are the helicoiled cylinders. No excessive carbon build up, didn't appear to be running lean, etc. I'll go ahead and replace all 8. I've never seen a misfire jump around to different cylinders like this before, EVER. It's really frustrating chasing around a misfire that may be stored wrong instead of focusing on one particular cylinder. I think I'm going to just replace all 8 coils since I've had misfires on only 4 to start. Then a dead mis on 2, then a misfire on 6 and 8. Then a mis on 1, 5, 6 and 8. Now a misfire on only 1 and 3. If I didn't know better I'd think that fords ECM has a hard time detecting which cylinder is misfiring. (My guess is that Ford's don't throw p301-8's very often. Just p0300's.)
I don't really have time to wait for shipping. I can get Ford to wholesale the coils to my work and pay a 10% mark-up, or I can get ACDelco stuff for dirt cheap on a cash ticket. Do you recommend OEM over ACDelco? I know that we as a GM dealer put alot of delco parts on instead of OEM due to the fact that they are OEM quality, but cheaper.
Also thanks for the quick replys and help.
EDIT: I found those coils from Global. That's a hell of a price. Do they crap out as often as the Fords? Has Ford revised the coil to add better windings. etc or are OEM coils still built to the same specs as the originals which seem to fail?
Last edited by V8Triton; 01-29-2010 at 01:31 AM.