Can you swap an ICM? UPDATE - was crank sensor! - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 04-29-2007, 12:01 AM   #1
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Default Can you swap an ICM? UPDATE - was crank sensor!

Hi all. Have a 92 Bonneville which has cost us a lot of $$$, headaches, and aggravation trying to keep running. Quick question, before hubby sends her to the junkyard (literally!). Most recent problem (thought we had this fixed a few months ago), she quit while idling at a stop light ... would not start back up (does crank over and over, but does not engage). Had the car towed home, now sitting in the driveway, and still refuses to start. This was about 4 hours ago. The car had been running fine before that ... and also, we checked for codes, but none show up. Anyway, my question. Among the many things poor hubby has replaced over the past few months was the ICM / coil pack. The one in there now is from the junkyard, and we wondered if maybe it'* gone bad? As a cheap and easy way to find out, we wondered about swapping it with my niece'* ICM / coil pack ... she has a 1994 Bonneville. Are these two years interchangeable? Thanks again.
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Old 04-29-2007, 12:46 AM   #2
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I'm not ansering as an expert, but I believe it would be fine. if you want to have someone check, just call a parts store and ask for the part number on both year cars. I'll bet you'll find they have the same number.
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Old 04-29-2007, 01:13 AM   #3
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If you have a 93-current (05) ICM and coil AC Delco style, you can swap any year.

If you have the old Magnavox 1-piece ICM and coil, you can upgrade to the Delco, but you will need the 3 coils also.
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Old 04-29-2007, 03:08 PM   #4
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You seem to be describing a car that has a Crank sensor failure... You may consider replacing the crank sensor as it can cause the car to stall out, also can cause it to not start or restart..

And yes you can swap the entire Coil assembly from the 94 as a test, It will work fine with the 92...

If the car still will not start, Have you husband check for Spark.... If there is no spark, I'd recommend replacing the Crank sensor...

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Old 04-29-2007, 03:24 PM   #5
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Yep, sounds like the exact same problem I had on my old 1992 SE. Crank sensor was going bad. I never did get it replaced, but my parents also had the same problem on their old 1992 and 1993 Buick Park Avenue Ultras and the crank sensor,one replaced caused no more problems.
Anyone know if the Series II L67 has the same crank sensor? If it is I have one you can have for $3.85 (the cost of USPS Priority mail flat rate box). I can mail it out Tuesday and you would probably have it Wednesday since you are only 1 state away.
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Old 04-29-2007, 03:59 PM   #6
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The 92 crank sensor should be different from the 93+ Crank sensors..

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Old 04-30-2007, 03:36 AM   #7
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Default UPDATE

Hi all ... thank you so much for all your great advice ... and guess what? You were absolutely RIGHT ON! It was, indeed, the crank sensor. I hadn't had the chance to relay your advice to hubby before he decided to "tackle the beast" again, but he also had a feeling about the crank sensor. This was what he had replaced last fall which finally fixed the problem at that time (was pretty much doing the same thing ... only once in a while it would actually decide to start). Anyway, upon removing it, he found the middle triangular part (magnetic/plastic thingy ... sorry for the NON-professional description ) had actually broken off the sensor and come out! He did find it and was able to get it out, thank goodness, or who knows what kind of mess we'd have now ... but after putting the new crank sensor in, Bonnie is starting and running again, and we are happy! One question, though ... has anyone out there ever had this problem before, with the magnetic/plastic thingy breaking right off the sensor?! If so, what would cause this? Would it have been a faulty part to begin with?... Advance did replace it for him, as it was under warranty, but they said they had never heard of this happening before? Or could a stone or something from the road have flew its way in there and broken it?! Just wondering ... would like to prevent this from happening again, if possible? Thanks again for all your great advice!!
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Old 04-30-2007, 04:53 AM   #8
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I'd doubt a stone flying in there. Crank sensor are normally physically damaged by bent harmonic balancer fins.
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Old 04-30-2007, 05:20 AM   #9
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Hmmmm ... very interesting ... will definitely relay info. to hubby. Thanks!
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Old 04-30-2007, 08:41 AM   #10
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Shoot, thought we had it figured out, but I guess not. Hubby says he checked this already, and the harmonic balancer looks fine. Any other ideas? Thanks again.
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