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Old 06-16-2014, 09:40 PM   #1
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Default Truck LS2 Coil swap - No Spark

I swapped the coils in my MSM to LS2 truck coils configured as waste spark with the oem ecu. Wired everything up and no spark! Looked through some threads and found out the LS2 coils plugs are rotated according to the megasquirt coil swap page: Megasquirt Sequencer Coils

Switched up the wiring to the correct way and still no spark!

Im getting pretty frustrated now, theres 12v power to the coils, I grounded the extra ground on the head near the coil. The only thing i didnt do is add the capacitor to limit voltage drop.

I have 2 ideas what it could be. Either the trigger from the stock ecu isnt cutting it for the gm coils, or the regular ground needs to be grounded at the ecu. I really dont know about the second one, reading around, they say that isnt needed, and the miata combines the signal and coil ground already.

Any help is appreciated. I dont want to put the stock coils back on unless im absolutely sure it will not work. Im currently diagnosing it so sorry if this thread is a bit messy.
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Old 06-25-2014, 01:13 AM   #2
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Old 09-22-2015, 11:40 PM   #3
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Disregard this post... I'm an idiot, I got the car running. (I forgot the plug the cam sensor back into the swap valve cover)

Last edited by FrankB; 09-23-2015 at 12:07 AM.
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Old 09-24-2015, 11:09 PM   #4
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wait so you got it running with stock ecu and ls2 coils? I never disconnected my cam sensor, but even with it plugged in, i still got no spark. Im starting to think that my ls2 coils are bad...
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Old 09-24-2015, 11:13 PM   #5
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Quote:
Originally Posted by square1 View Post
wait so you got it running with stock ecu and ls2 coils? I never disconnected my cam sensor, but even with it plugged in, i still got no spark. Im starting to think that my ls2 coils are bad...
No sorry I'm running a MS Labs MS2e so it wasn't exactly the same issue. My mind was all over the place that night, sorry for the confusion.
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