Does not start if engine is warm?

2012 OPEL INSIGNIA
62,500 MILES • 2.0L • TURBO • 2WD • MANUAL
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DAN2021
  • MEMBER
  • 2 POSTS
Hi all, I have a vauxhall insignia 2ltr diesel ecoflex. my problem is this, when I do any journey 30 minutes and above then turn the engine off it won't start again for at least 30 minutes . Once it's cooled down it starts and drives absolutely fine, code reader say no faults battery test reads 87% life, 100% charge which ruled out alternator. I'm now at the point where I do not dare switch it off , and worry when filling up incase it won't start . Does anyone have any advice or had the same issue?

Thanks for reading all advice is greatly appreciated.
Jul 31, 2021 at 5:35 AM
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SQM
  • ✓Experienced Mechanic
  • 6,383 POSTS
Hello,

It sounds like you probably have a faulty coolant temperature sensor.
It is preventing the engine from starting when the engine is hot. It is probably sending a signal to the ECU that the engine it "too hot" to safely start.
Unfortunately I do not have access to the diagrams for that vehicle.
the temperature sensor should be located on the right hand side of the engine, if you are facing the engine.
It's on top of the thermostat housing.

https://www.2carpros.com/articles/how-a-coolant-temperature-sensor-works
https://www.2carpros.com/articles/symptoms-of-a-bad-coolant-temperature-sensor

Let me know if you have any questions.

Thank you.
Jul 31, 2021 at 2:12 PM
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DAN2021
  • MEMBER
  • 2 POSTS
Thank you. I shall look into that.
Aug 1, 2021 at 12:00 AM
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SQM
  • ✓Experienced Mechanic
  • 6,383 POSTS
You're welcome.
Let me know how it turns out. Thanks.
Aug 1, 2021 at 2:52 AM
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