stumbles for some reason? (Page 4/4)
Patrick SEP 16, 02:13 AM

quote
Originally posted by katie80:

...replacing the ICM completely fixed the issue.



Interesting. The ICM certainly has a history of failing (for various reasons) with the 2.8, but not so much with a duke. That's not to say that an ICM never fails with the 2.5, but some of your issues/symptoms seem rather irregular for an ICM failure.

Anyway, glad you finally got your car running properly.
katie80 SEP 16, 01:49 PM

quote
Originally posted by Patrick:

Interesting. The ICM certainly has a history of failing (for various reasons) with the 2.8, but not so much with a duke. That's not to say that an ICM never fails with the 2.5, but some of your issues/symptoms seem rather irregular for an ICM failure.

Anyway, glad you finally got your car running properly.



I think it failed because it was the original with 120k miles but it sat outside in the car for 15 years and then started being used a whole lot by me. and maybe it was just getting weak.
Rexgirl SEP 16, 03:50 PM
Since it was sitting for 15 years, possibly the two attachment screws (which ground the ICM?) were corroded and making intermittent connection ? We know Fiero's can get pretty goofy when they sit idle for a long time.
katie80 SEP 16, 04:27 PM

quote
Originally posted by Rexgirl:

Since it was sitting for 15 years, possibly the two attachment screws (which ground the ICM?) were corroded and making intermittent connection ? We know Fiero's can get pretty goofy when they sit idle for a long time.



I didn't even consider that, but the screws are still the originals and the issue is gone now.
Patrick SEP 16, 04:38 PM

quote
Originally posted by Rexgirl:

Since it was sitting for 15 years, possibly the two attachment screws (which ground the ICM?) were corroded and making intermittent connection?



I should've also specifically mentioned the attachment/grounding ICM screws... but yes, I still feel this might've been an electrical "connection" problem.


quote
Originally posted by Patrick Here:

Occasionally when an ICM "fails", it's actually just a poor connection. Take off the distributor cap, unplug the pickup coil from the ICM, clean the connections, apply dielectric grease, and re-connect. Do the same with the external connections to the ICM and to the ignition coil.
katie80 SEP 16, 11:22 PM

quote
Originally posted by Patrick:

I should've also specifically mentioned the attachment/grounding ICM screws... but yes, I still feel this might've been an electrical "connection" problem.

[QUOTE]Originally posted by Patrick Here:

Occasionally when an ICM "fails", it's actually just a poor connection. Take off the distributor cap, unplug the pickup coil from the ICM, clean the connections, apply dielectric grease, and re-connect. Do the same with the external connections to the ICM and to the ignition coil.


[/QUOTE]

I did try the things you suggested in that post, they didn't fix the issue.
Patrick SEP 16, 11:27 PM

quote
Originally posted by katie80:

I did try the things you suggested in that post, they didn't fix the issue.



But did you loosen and re-tighten the original ICM attachment/grounding screws (to create a fresh ground path) as Rexgirl specifically (and I should have) mentioned?

[This message has been edited by Patrick (edited 09-16-2021).]