Gang:

I think that I have a bad coil pack. I have what sounds like a miss at all RPM, worst at low rpm and high load. At 2000 RPM and 1/2 throttle, it pulsates pretty good. It's kind of a "fluttery" sound with the stock muffler, but a pronounced "beat" with straight pipes (currently for sale - too loud).

I'm thinking that a coil pack is the likely culprit, if anything. I'm not crazy about buying a new coil ($100) and swapping it into each position in sequence.

I wouldn't mind pulling all of the coils if there were some way to test them. I have access to NRC-certified electronic testing equipment of all types (multimeters, oscilliscopes, and anything you can imagine). Does anybody know of a good method for testing coil packs?

Thanks for the help in advance.

 

How about disconnecting them one at a time and driving the beast? Would that reliably identify a bad coil, or does a bad one screw things up in a more subtle manner?

 

A friend of mine with a 5.4 has been through 3 coils in two months. One of them was #4 but he does not want to believe the heater hose leak story.

Does the test equipment you can use include a real good tach?
Unhooking one coil at a time should get you a drop of about 100 rpm's. That might help you locate a bad one. Should be the same as disconnecting one of the fuel injectors.

 

The easiest way to check and see if one of your coil packs is bad, is to start your engine and one by one, unplug each connector one at a time. When you unplug each one, the engine will start missing. If in fact you do have a bad coil pack, the one that is bad when you unplug it will make no change in the idle of the engine. I have had to replace one of mine before.

 

Holy Archive Batman!

 

I hope he figured it out sometime within the past five years.