No spark from coil! BRAND NEW GM Opti. Did Shoebox test's!
 

ok well this morning i went to start the car and it just cranks. Just put in a BRAND new GM opti, brand new coil, brand new plugs and wires. Ok i did the ShoeBox testing for voltage to the ICM. it get's 12 volts but when cranking it like it says i don't get ANY A/C voltage. So i pulled the harness that comes from the opti and tested the the end that plugs into the PCM harness. Not the side the goes into the opti itself. Anyway, i get NO power there at all. It can't be the opti as it was running GREAT last night but when i went to start it after sitting overnight it won't start. Grrr. this is FRUSTRATING. i've ruled out the ICM as it's getting power but no power coming from the opti:( Bad Opti harness maybe? don't know if it's been replaced at all. ~Cole~
P.S. Help is GREATLY appreciated as i'd like to get my car back up and running soon here. Thanks

Yes - I would suspect the opti harness

It is plugged in all the way.....right?

yeah it was plugged in but i went and pulled it all out and messed with it and plugged it back in and fired right up. It's gotta be the harness. i have a new one from casperelectronics being shipped overnight:)