The Mighty 258 > Engine Electrical Systems.
Broken down!! Ignition module or??
Mac:
Was driving to work today, and about halfway there, (point of no return, I guess ;)), it started sputtering and faltering and
stalled out a bunch of times.....
I limped it to work by popping it into neutral many times, driving with two feet trying to keep the revs up...
Had to restart it a bunch of times while coasting...
Got stuck about 4 blocks from work where it would not restart! A few minutes later it fired and up and I sputterly managed
to get there!!
I basically coasted it into my parking spot at work when it stalled for the last time...
Every time it happened the tach would drop right to zero... Even though it was still sputtering and surging...
Classic signs of a failing ignition module right??
At around 11am, I went out to see if it would start, and it fired up and purred like a kitten!!!
For about one minute, then died like I'd turned the key off!!
Waited a few minutes... Tried again... Same thing!! Ran about one minute and then shut off!
Totally classic failing ICM right??
Well!! I've always carried a spare just in case of this sort of thing!!! Perfect!!
After work, I swapped out the ICM for my spare, and it fired right up!!
Let it run for about 15 minutes in the parking lot and it idled like a dream the whole time!
Locked up the shop, got in the car, texted my girlfriend that the car was fixed, and that I
was on my way to her place!!
The second I hit "send" the car died just like I'd turned it off!
Would not restart... Got a couple of hiccuppy sputters, and that's it!!
So!!! What do you think?? If not ICM, what else would cause these symptoms??
I should mention that the spare ICM I installed was an original AMC part that would be about
37 years old now.... And I honestly don't remember where or how I obtained it!!
Pretty sure I wouldn't have thrown an unknown module in the trunk as a spare if I didn't know
for SURE that it was functional, but it was so long ago, I really can't remember!!
I guess there's a chance it's faulty too!!
I'm going to order a new replacement, but I'm wondering if anything else might have similar
symptoms?? Ignition coil maybe???
Haven't had a chance yet to peruse the TSM....
Oh... I maybe should mention, that it's the yellow ICM with 3 connectors...
1982 only, I seem to recall....
The computer has been bypassed... No feedback carb...
Large distributor cap conversion...
Original style coil and connector...
Thoughts??
amcfool1:
Coil maybe?
mudkicker715:
This does not scream icm.
Mac:
What does it scream?? ;)
It ran one minute again this morning....
Had it towed home after work... It ran less than a minute up the driveway and
died halfway into the garage...
Going to be probably mid-week before I get a new ICM...
But in the meantime, I'll check all the ignition circuit wiring and connections, and
I think I have a new Flamethrower coil around somewhere that I can swap in to
see what happens!
What really sucks is, that this is my daily driver!! :(
Draekon:
The tach dropping to 0 does sound like the coil or ICM is failing.
However, I've had the rest of the symptoms you describe occur when crap in my gas tank got sucked up and caused my fuel pump to start to fail. I can't explain why letting it sit would help, but it did. Replacing the pump and installing the prefilter fixed my problems
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