I Have Misfire Trouble Codes:
If your Ford vehicle is registering misfire codes, half the diagnostic battle is over. Now, the most important thing you need to do, is identify which cylinder or cylinders are the ones that the misfire codes are accusing of misfiring.
This is pretty easy, and since it's key to using this test article, I'll show you how in this section.
OK, this is what you need to do to get this show on the road:
I Don't Have Misfire Trouble Codes:
If you have NO misfire codes but you do have a bona fide misfire condition (and this happens A LOT!)... you can still use the info in this article, the most important thing you need to do is identify which cylinder or cylinders are misfiring.
To find out which cylinder or cylinders are the ‘dead’ ones, you're gonna' have to test all of the spark plug wires for spark or do a cylinder balance test. The cylinder balance test is done by disconnecting one Fuel Injector at a time.
I have written step-by-step instructions on this cylinder balance for the 4.6L and 5.4L Ford engines with C.O.P ignition coils... but the instructions will apply to your specific 4.6L with coil pack ignition. You can find it here: TEST 5: Cylinder Balance Test (found at: easyautodiagnostics.com).
OK, once you have found out which cylinders are dead:
The following links will help you comparison shop for the original Motorcraft and aftermarket ignition coil packs:
Not sure if the above ignition coil packs fit your particular Ford? Don't worry, once you get to the site, they'll make sure it fits. If it doesn't, they'll find you the right one.
I've written several more articles that may be of interest to you. These are specific Ford car (pick up, van)... at: 4.6L, 5.4L Index of Ford Test Articles.
Here's a small sample of the tutorials you'll find:
“Remember, this hobby is supposed to be your therapy, not the reason you need therapy.”