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Crank not start after it gets hot

Tiny
JERRY1964
  • MEMBER
  • 2007 JEEP LIBERTY
  • 2.3L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 127,000 MILES
After driving vehicle about 20 miles it shows that it is over heating. The coolant is not boiling over, seems normal, no leaks, nothing that would indicate overheating. The oil is clean, no water mixing with the oil. Turn the vehicle off, after about 10 minutes it will turn over but not start, after about 30 minutes it starts fine. Is there a sensor that after it gets hot that would cause this? All help would be appreciated. Thanks
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Friday, June 21st, 2019 AT 10:40 AM

1 Reply

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

This sounds like it could possibly be a Crankshaft Position Sensor (CKP) that is starting to fail. Your vehicle's Power-train Control Module (PCM) uses the signal from the CKP to determine where the engine is in it's four cycle stroke. Without this signal your vehicle will not start. The sensor will usually start to fail when it gets hot. Unfortunately it is usually tested with an oscilloscope to test the frequency, but they are relatively inexpensive to purchase and easy to remove and install. I have included the location of your vehicle's CKP sensor in the diagrams down below and here is a link for you to go to on how to replace it:

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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Sunday, June 23rd, 2019 AT 2:31 PM

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