Car just cranks will not turn over or start

1988 CADILLAC FLEETWOOD
135,000 MILES • 4.5L • V8 • 2WD • AUTOMATIC
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DAVID GRAY
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  • 1 POST
My car just cranks wont turn over. I have new plug, cap rotor , coil pack and distributor, alternator and power steering pump just replaced three months ago. was running perfect until this morning and it wouldn't start just cranks.
Apr 22, 2019 at 11:12 AM
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SCGRANTURISMO
  • CERTIFIED EXPERT
  • 4,897 POSTS
Hello,

This could be a problem with your vehicle's Crankshaft Position Sensor (CKP) having failed. Your vehicle's Power-train Control Module (PCM) uses the signal from the CKP to determine if the crankshaft is rotating, how fast it is rotating and uses this information for crankshaft rpm's and for misfire monitoring. If it is not getting a signal from the CKP it won't know that your engine is turning over and wont start it.
I have included a diagram of the CKP location in the diagrams down below. Also, I have included a few links below for you to go to below.

https://www.2carpros.com/articles/how-a-crank-shaft-angle-sensor-works
https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor
https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

Please go through these guides and get back to us with what you are able to find out.

Thanks,
Alex
2CarPros
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Apr 22, 2019 at 12:18 PM