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Nitrousbird

LS1 coil packs...are they automotive based?

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Nitrousbird

The coil packs on the LS1 package are remote coils.  P/N 1103965 is printed on the ICM unit they plug into.  That is a dead P/N, but it looks like it cross references to the coil packs from a 2.2L 1996 Cavalier, though it appears to have been used in newer vehicles as well. 

I pulled the coil pack itself - nothing looks different than an automotive coil.  It has the two posts for the plug wires, two slots for the flat pins from the ICM and otherwise, it is a sealed unit.  This is the coil pack:
https://mcpartsdepot.com/products/coil-for-556011-lt1-ltr-coil-pack

Peter Brown at Smooth Water, my normal go-to for parts, quoted me around $75 when I inquired last year.  Or I can get an AC Delco unit for $31 shipped:  https://www.amazon.com/ACDelco-D555-Original-Equipment-Ignition/dp/B000BYB1QM/ref=sr_1_1?keywords=10482928&qid=1554760297&s=gateway&sr=8-1

Why am I replacing?  I've been getting a rough idle, especially when going no wake for a couple of minutes.  Boat isn't running as smoothly as it once did either.  I pulled the plugs and found the #5 plug was wet and not looking like any of the others.  I already replaced the plugs and checked the resistance on the plug wire (which are upgraded Jegs cut-to-fit wires I installed back in 2011, as the Indmar wires failed).  I figured this would be a cheap swap to see if it resolves the issue.  Could be an injector issue too I suppose, ICM issue, or something worse, but going with the cheapest/easiest routes first.

I just want to make sure there are no safety issues before I swap out this coil pack.  

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oldjeep

Why don't you just swap the suspect one onto another cylinder and see if the wet plug follows? 

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Nitrousbird
2 hours ago, oldjeep said:

Why don't you just swap the suspect one onto another cylinder and see if the wet plug follows? 

Don't feel like dragging out the process, especially for a $30 part I can return to Amazon. :). Just making sure I am being safe doing it. 

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