I hate coil packs (No 56k now)

[NebraskaSHO]

Had one crap out on the way back to Lincoln yesterday. At first thought it was a transmission problem, but then it started the tell-tale stumble at idle, and it rev'd slow.

Last night I took out one coil at a time on the front bank and replaced it with a new Ford coil. Miss wasn't found

Today started it up and misses consistently at idle. Going to check the codes again, but it's 99 degrees out right now. And I'm going to stay inside until it cools down to at least 90. I don't have enough beer to drink to keep cool in this kind of heat

Oh, BTW, no code of course...

 

[NebraskaSHO]

Here's an idea, could I pull the plugs in the rear bank one by one and look for one that's possibly fouled?

When I last had a rear pack go bad, I swapped a front spark plug into that back cylinder in case it went bad and would be up front where it would be easy to switch. I did not want to take the intake back off just because of a fouled spark plug.

I just don't know how fouled a plug on a fuel injected car could get...

F it. I'm going to go tear my car apart just because I feel like getting a sun tan. I'll post back later probably drunk and with a heat stroke

 

[nothingtoseehere]

Last night I took out one coil at a time on the front bank and replaced it with a new Ford coil. Miss wasn't found

You're halfway there. You know the fronts are good, so swap front to back and disconnect one at a time again. Also check the wiring harness. my number two coil seemed to always cause a miss ... this weekend, I changed all my plugs and swapped my coils, the two wires coming off the ocnnector on my number two coil had gotten hot and the coating melted through, leaving exposed wire. Electrical tape to seperate them and some high heat wrap I used on my intake, and no more miss ... with all the same coils.

 

[NebraskaSHO]

Randy, I know that 3 in the back are new within two years. One is older.

I'll EDIT this with the pictures I took. As I thought, it was the one old coil pack in the rear. Total time was an 1.75 hours from initial tear down until it ran again without a miss. Got lucky.

Took another twenty minutes to finish up with the surge tank bolts and brackets.

Here we go:

Teardown


ARGH




Handy little tool, magnet and a led flashlight


Motivation


The bad coil is third from the left


It runs! Support brackets missing.


Started at 3:58


Finished, all brackets reinstalled.


Cracked boot, possible reason for failure?


And just cause


And for the record, all the plugs looked the same. Light tan, so my theory of finding a slightly fouled plug was... foiled.

 

[Silvapain]

From my experience, the white-topped Motorcraft coils fail the most.

If you don't have them already, I recommend a good set of ratcheting metric wrenches. Makes jobs like those surge tank support brackets much easier.

Out of curiosity, why did you pull the runners and horns out of the surge tank? I always just remove the tank and runners as one unit.

 

[sandrew]

Blame it on the heat.

 

[NebraskaSHO]

From my experience, the white-topped Motorcraft coils fail the most.

Out of curiosity, why did you pull the runners and horns out of the surge tank? I always just remove the tank and runners as one unit.

So I could clean them, and the gaskets. Also gives me something to grab onto.