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03-23-2020
The way the pcm reads misfires is based on info from the crank sensor (to know which cylinder) and the knock sensors detecting something being off. Say for example if your compression is low, that could give you a misfire code.
While you are working on it, if you checked say cylinder 3 compression and it comes up as 180ish, that would point you to maybe a chipped piston or something keeping you from getting good combustion in #1.
Is this an NA or SC engine?
03-24-2020
I swapped the coil out with a good one and it stayed right there in #1 cyl. I am going to do a fuel press test tonight although it has the new injector. I am starting to think it might be the ICM board although....This is a wasted spark system correct? If when I swapped #1 and #4 plug wires on the towers, and it was the tower/side for #1 coil that was bad, shouldnt it have moved to #4 cyl?
I will try doing a compression test again. If it is at 125psi and the rest are at 180 psi, would that be enough of a difference to missfire that hard. Last night, under 1000rpm it barely stayed running.
Thanks
03-24-2020
It is not a SC engine. If like billboost said, if a low compression reading tells the crank and knock sensor somethings not right, or if it was a bad coil, wouldnt that also leave #4 misfiring also?
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