No spark

[Ktuck]

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?

 

[OR VietVet]

Welcome to the forum from Oregon. Introduction thread lost another one.

What does it look like inside the distributor? How old are the parts in the distributor? May have damaged the ECM.

There is an UPDATE that talks about a jumper wire on the ECM helping with trans shifts? Care to share that UPDATE?

 

[TollKeeper]

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.

 

[exp500]

Try this-Part 1 -How to Test the GM Ignition Control Module (1995-2005)
Keep in mind you may have fried ECM.

 

[Doubeleive]

in addition I think you need to do a crank position relearn since you replaced the sensor, not sure if that applies to the obs motors or not.