I did all the tests on line and YouTube for ground and power and signal. I checked the pink wire from the ignition switch to make sure I have power with the key turned. I even put in a new coil and ignition module but no spark still. All that is left is the see if I get the intermittent 6 volts as the crank pulley is turned.

 

 

I'm still not clear, is your engine cranking or do you have a no crank situation?

 

I'm sorry, i thought it was obvious that it was cranking over because it was a "no spark" issue. If an engine wouldn't crank I would be looking at the ignition and starter/battery area. I believe I mentioned that everything else electrical was fine and I established their was fuel and no reason to check fuel pressure. No, the only issue is NO SPARK. Once that matter is resolved, and hopefully with the final test at the crank sensor identifying the problem, I can get on to resolving the problem.

 

Ok, thanks...I wan't dead positive and didn't want to make assumption. While you're waiting for your help, a quick check you can do is crank your engine while watching your RPM gauge. It should bounce (flutter) slightly off of 0 as you crank. If not, and it stays rock solid, that can indicate CKP sensor or circuit problem.

 

Thank you for that tip. i will check that right away as I wait for my friend to make it here to get going on that test. love the ZR2 but those skid plates can be a real pain sometimes. Let you know the results.

 

The tach moved off the fin to the zero and fluttered while cranking. Does that mean the crank sensor is working? I sure would like to not have to do that test. If it's not the crank, whatsw left? The PCM?

 

Can I take a PCM from another Blazer? I have one from a 99 that I know worked until the engine blew. Can I just swap it out?

 

Here is a new discovery. I just took off my negative battery cable and it's sparking like crazy when the terminal is touching the post. I've always taken the negative off first to prevent sparking that can occur if you remove the post first. IveI never heard of neg sparking. Should I be pursuing this?