97 blazer CKP sensor

You can do a crankshaft sensor bypass test to confirm the crank sensor is not producing an A/C sinewave signature signal to the module.

That test will confirm many things including circuit integrity, internal pcm drivers including fuel pump driver, ignition coil driver but clearly show if you have a no fire condition that the parts associated with ignition are good for an exception of crank sensor.

Nonetheless if the crank is rubbing the sensor it needs corrected even if the part is good because it should not rub.

To perform that test you need a conventional test light hooked to bat+ and a t-pin back probed at the + crank signal wire and you momentarly touch the tip of the test light to the t-pin and should produce a high/low signal good enough to fool the driver to produce the needed test.

Understand? I didn’t think so 🙂

I would see if you have a check engine light to see if there is any codes for the CKP circuit to start with.

Obviously if you have no spark ot no injector pulse, then you can be confident of a CKP circuit integrity issue.

Keep us updated.

I loved Duane’s video, that guy is awesome and I love his work. I admit that the marks on the CKP are a probem and that needs to be corrected probably with the recommended shim but lets not ignore the elephant in the room here, have you checked for spark and fuel? The engine timing? Without knowing what you are missing with a no start you haven’t gathered the ‘evidence’ that Duane always speaks of. Your crank sensor may very well be damaged but if you don’t know what’s missing when you try to start the truck your putting the cart before the horse so to speak. Here’s my video on diagnosing a no start.

http://www.youtube.com/watch?v=FBUYs539cy4

Awesome, if the issue is resolved don’t forget to turn your ‘traffic light’ to green. Thanks for the update.

Awesome,
I learned something new also.

Long live the ETCG Forum!T)