Been getting a misfire code on cylinder 6.
Got spark plugs changed at dealer. Changed the wires myself. (Both long overdue). Noticed that some of the old plugs were showing 'lean' white-ish stuff on them. I'm getting pinging when going up hills also (maybe that intake manifold problem that people talk about).
As wires and plugs were new, and code later came up again, I decided to test the ignition coil. It's the original one, after all. Seemed to be the next logical thing to do. Primary resistance checked out OK. It tested secondary resistance of approx 13.5K.
As this is supposed to be 6.5K-11.5K, according to Haynes manual, I purchased a new ignition coil.
First I purchased a Wells ignition coil, the new unit tested 12.7-12.9K secondary resistance. As I read such bad stuff about Wells ignition coils and it seemed to be out of spec, I decided not to install it, and returned it to the store.
I then purchased the Motorcraft one. This one tested 13.2K secondary resistance.
I then purchased some 10K and 20K resisters from radio shack. Using the same multimeter, these all check in easily in spec (+/-5%), eg. the 10K resisters test at 9.69-9.67K, and the 20K resiisters test at 21.3-21.4K.
So, that seems to validate that the multimeter is working OK.
So, is the spec on this part off, or whats the deal?
I'm guessing that the new motorcraft ignition coil probably won't do anything to help...but thinking of installing anyhow, as it would be a pain to return back to the store (bought mail-order).
If the new ignition coil doesn't help, what's next....thinking a visit to the dealer for them to look at injectors/hook it up to whatever tools they have? I did read about the camshaft sensor, and another sensor that might be pertinent.
Paul