Car ran and drove flawless, parked it for a month and won’t start, not getting spark. Replaced ignition module and still no spark, my buddy told me bad crank sensor how do I know that for sure without replacing it? Also code reader won’t read it says no signal. It’s a pain in the rear to get to under throttle body behind by firewall, 2002 Pontiac sunfire 130k miles push rod motor with air intake on the back. Need help asap!
There are quite a few youtube videos showing how to test those sensors. On a car that old I'd also visually check the notched ring that triggers the sensor.
https://www.youtube.com/watch?v=RvuzZJqQDf4
Yeah I saw that video, but like I said I was wondering how to know if it’s bad without taking it off? It’s a 4-5 hour process to fix it
If the ECU is getting a signal from the crank sensor a good scan tool will show engine rpm in the live data while the engine is cranked. (If the car has a tachometer that should bounce while cranking if the sensor is working.) Of course if there is no rpm reading that just tells you the signal is not being seen. It does not tell you whether the problem is the sensor itself, a wiring problem downstream from it, an ECU problem, or if the notched ring is broken. However in such a case the sensor is the most likely problem.