Ok here's the deal, I have an 01 Jimmy I just did an oil pan, timing cover and valve cover gaskets on. Car cranks but no start; popping a p0335. Unplugged crank sensor; I have 12 volts, ground and a signal (sort of). When I do a bypass test on the signal wire (test light connected to battery +) coil fires. Although, when I do the same test with my power probe, WITHOUT pressing the 12 volts button, the coil fires and air pump kick on. I traced the signal wire back to the computer and did the same test, same results. Is this a bad pcm? I was hoping to find the wire rubbing on ground but I don't see anything.
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