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Crankshaft sensor not working properly

Tiny
JOESAMPLE
  • MEMBER
  • 1995 ALFA ROMEO GTV
  • 2.0L
  • 4 CYL
  • 2WD
  • MANUAL
  • 300,000 MILES
Stop working when the engine heats up.
Monday, September 16th, 2019 AT 12:08 PM

6 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Hi,

Have you replaced the sensor? Crankshaft sensors are Hall Effect sensors and when they get hot they actually open the contacts which causes them to not send a signal. The vehicle will then shut off until it cools down.

If this is what yours is doing you need to replace the sensor.

https://www.2carpros.com/articles/how-a-crank-shaft-angle-sensor-works
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Monday, September 16th, 2019 AT 6:08 PM
Tiny
JOESAMPLE
  • MEMBER
  • 4 POSTS
Hi,
I have replaced sensors two times (Facet/EPS) but the problem is still the same. And the vehicle works fine again until it cools down.
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Tuesday, September 17th, 2019 AT 12:34 AM
Tiny
JOESAMPLE
  • MEMBER
  • 4 POSTS
PS. The engine runs and starts even when it is hot but. If you increase the RPM (video).
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Tuesday, September 17th, 2019 AT 5:58 AM
Tiny
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  • MECHANIC
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Hi. The video did not come through. Can you try again? Thanks
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Tuesday, September 17th, 2019 AT 2:41 PM
Tiny
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  • MEMBER
  • 4 POSTS
Take 3: video plus attention! I hold the accelerator pedal in one position.
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Monday, January 13th, 2020 AT 5:17 AM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
You have an issue either the the coils for the ignition or the injectors, or lastly the control unit. This light coming on each time the RPM drops indicates this as an issue.

Unfortunately we don't have a service manual for this vehicle so I can't give you the specifics but I would start with checking for codes and then hooking up a scan tool to see what the sensors are doing when this happens. I suspect the o2 voltage will give us an idea on what is happening.
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Monday, January 13th, 2020 AT 7:01 AM

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