2009 prostar isx crankshaft sensor issue

[Notch]

(01-03-2025 )Zmcd Wrote:  My truck has been at a shop for 5 weeks now. A different shop, not the one that drilled the crank sensor out. After replacing the ecm, and engine harness the issue is gone. The truck runs normal as far as the motor goes. It runs smooth without erratic rpm changes. I’m now having a different issue I will make another post for. I know for a fact the tone ring is damaged, I saw where it got drilled thru. Teeth are still there, just damaged or chipped at one corner. But truck seems to be running good now.

It sounds like there is probably enough of the tooth left on the damaged one/s that the crankshaft position sensor is still able to pick it up and output a reference pulse to the ECM. Which would make sense being a hall effect sensor and not a VR sensor, but that's a whole other topic... Glad to hear that part of your issue is resolved.

And as a note, my experience has been that original crankshaft position sensors always seem to be a pain to remove on these. I will unbolt them and then turn them as much as I can back and forth to try and break them free in the bore before trying to pull them out. And worst case if they break apart when trying to pull them out, I will run a wood screw/self tapping screw into them and pull on the screw.