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Old 01-17-2011   #1
FattyBoomBatty
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Join Date: Dec 2003
Location: Boulder, CO
Drives: Conquest
Posts: 5,049
misfire on cylinder 4 with AEM, 1990 DSM coilpack setup

It's pretty consistent and changing injector plugs from one to the other doesn't change it. When I lay a plug on the turbo and crank it, it sparks fine, but doesn't fire in the engine.

Compression is fine, timing is fine, it sounds exactly like Jungy's car in this thread:
http://www.mitsustyle.com/forums/showthread.php?t=27943

I've checked a bunch of stuff, tried logging which doesn't show anything, turned off each injector, that didn't change it really, I tried turning off the coils in AEM, but that didn't seem to work. It's wired like a DSM, I never cut the Coil or power transistor wires, they are all stock.

Bad power transistor? I tried new coils with no change.
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