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I have a 97 Tahoe. I tried the update with jumper wire on the ECM for no shift into 3rd and 4th gear. Now I have no spark. The ECM fuse's are good and I installed a new crank sensor. Still no spark, any ideas what it could be?
Your going to need to pull your ICM out of your distributor, and get it tested. They have a pretty common failure rate, so thats where I would start. Its sits just under the cap and rotor. I think it has 2 or 4 screws, and 2-3 sets of wires.
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