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Car cranks on warm start and randomly shuts off

Tiny
DEWALDVDW
  • MEMBER
  • 2015 VOLKSWAGEN POLO
  • 1.4L
  • 4 CYL
  • 2WD
  • MANUAL
  • 85,127 MILES
Hi all,

For the past 2 weeks my car listed above Blueline has been cranking on warm start, we have tested the car and it indicated no problems. We have replaced the petrol filter and pump, it still had the same problem. We also replaced the crankshaft sensor as well as coolant temperature sensor, still same problem with a new problem, car switches off randomly. We would appreciate any advice.
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Monday, October 14th, 2019 AT 7:12 AM

7 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Hi,

Just so I understand so I am giving good advice, when it is warm it will only crank and not start and it will randomly shut off?

If so, have you done anything with the crank sensor? When the crank sensor gets hot, it randomly goes open and the engine shuts off and then does restart until it cools down.

Here are some guides that walk through this in more detail. Let me know what you think and we can go from there. Thanks

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

https://www.2carpros.com/articles/camshaft-angle-sensor-replacement
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Tuesday, October 15th, 2019 AT 2:36 PM
Tiny
DEWALDVDW
  • MEMBER
  • 4 POSTS
Yes that is correct.
Yesterday I did a diagnostic test and this is what it say in the pictures.
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Tuesday, October 15th, 2019 AT 11:30 PM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Okay, that is saying you have no crank signal. It could be a wiring issue but most likely it is the sensor itself. If it were me, I would ohm out the wiring and then replace the sensor and go from there.
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Wednesday, October 16th, 2019 AT 8:18 PM
Tiny
DEWALDVDW
  • MEMBER
  • 4 POSTS
Hi
I have changed the cam shaft sensor as well, wiring is fine on the vehicle.
We tested the wiring of the crank shaft and the cam shaft.
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Wednesday, October 30th, 2019 AT 3:56 AM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Okay. Assuming that is all good, when this acts up does it start when you use starting fluid? Lastly, is this the direct injection engine or diesel?
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Wednesday, October 30th, 2019 AT 6:39 PM
Tiny
DEWALDVDW
  • MEMBER
  • 4 POSTS
It starts but just take long to start. Had the car on a diagnostic machine last night and it still give me that 1 fault P0322. Don't you think it can be the crank shaft pickup in the gearbox?
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Wednesday, October 30th, 2019 AT 10:42 PM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Absolutely it can. Long cranks are either fuel related or crank sensor related. Basically the engine will fire without a crank sensor but it takes longer cranking because it needs to learn the engine position through the other sensors.
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Thursday, October 31st, 2019 AT 5:39 PM

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