That odd one looks like a limp mode, I thought the module only controls advance in limp mode, and under normal conditions it only signals cylinder static advance and the emc/pcm timing table does the rest. ??Originally Posted by dave w
That odd one looks like a limp mode, I thought the module only controls advance in limp mode, and under normal conditions it only signals cylinder static advance and the emc/pcm timing table does the rest. ??
Dean
it seems most don't last long but every once in a while, one finds a good ICM that lasts a lifetime. dang even the acdelco ICM failed?
are you running a modded computer?
i just had one fail a few days ago(it was two weeks old) the one i replaced was fine. i shoulda left it alone. back to the point. i had just patched my 7747 with the spark advance hack and it failed that evening...coincidence?
sorry been out all weekend. The ICM's have been in the stock computer when it was a 5.0 and failed, in a very light modded 350 with a new distributer and failed and now in my modded 357 and failed. The timing/SA does not look wierd. This time it died and the truck was not even warmed up, I was ideling for about 15 minutes but it was 50 degrees out, shut the truck off and 2 minutes later tried to start and no fuel as the ICM does control allowing fuel. I have had 3 different tbi trucks and this is the only one that has ever given me issues, all were modded and all had headers full exhaust, electric fans, ignition systems or msd coils and moroso 8.65 ultra 40 wires. The coil and wires are about 1yr old as I replaced them right after the ICM died a year ago, for some reason it is about every year which makes no sense. I am gonna try the Artic Silver 5 thermal paste I use on my overclocked gaming computers and see if that helps. I was just throwing this out there to see if anyone else has had this same issue where it dies once a year, I usually put about 10,000 a year on the truck. Anyway thanks for the responses.
i had two icms go out in 3 weeks now. but my connectors where a little loose.(maybe they loose connection enough with engine vibrations to shorten the icm life?) maybe check your pigtails? also my GM icm never fails. but every aftermarket one failed so far. really leaning towards--maybe they are all junk? just some ideas..
One thing I think I have noticed over all 6 of these icm's failing is that it dosen't crank as fast when I start the truck for about a month before it dies. I just think it is very weird it is every year, not a few months or at random times but almost exactly a year apart these things die and dosent matter if gm or aftermarket or performance ones they all fail same time about 1yr. So I am keeping a space in the truck, I have the tools to change it out quickly so if it happens I can change it. I will also see if next time it starts cranking slower when starting and see if that is a side effect before it dies. But we will have to wait for a year because that is the pattern so far.
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