Crankshaft positioning sensor blows again

Tiny
TURFDOG
  • MEMBER
  • 2004 HYUNDAI SANTA FE
  • 2.7L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 170,000 MILES
Crankshaft positioning sensor blows again. This is the fourth sensor put in it keeps blowing on me. I’m really not sure if it’s the crankshaft positioning sensor no check engine light came on but I couldn’t go over 20 miles an hour. Could be the computer affecting the sensor? I have a slight oil leak losing about a half a quart a month or less could be wedding to center?
Saturday, July 25th, 2020 AT 4:32 AM

21 Replies

Tiny
KASEKENNY
  • MECHANIC
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What happens when the crank sensor fails? Does the engine stop running? I am just wondering you are confirming that the crank sensor is the issue or after you change the sensor the issue is not different?

I imagine that the engine will shut off and then you replace the CKP sensor to get it started again?

If so, we need to measure voltage at the sensor. You have one wire (yellow) that is from a shared fuse for all the other sensors. It is possible that one of these other sensors/actuators is shorted which is causing an issue with the crank sensor. The other possible cause is as you stated that the control module has a short.

However, lets start with checking voltage at the sensor and going from there. Thanks
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Saturday, July 25th, 2020 AT 4:54 AM
Tiny
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The only reason why I think it’s the crankshaft center is because it won’t go over 2,000 RPM's. Then it bogs down just like it did last time only last time it was 3,000 RPM's I was able to shift manually and get the car home. This time I could barely make it up the hill to my exit at work.
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Saturday, July 25th, 2020 AT 8:21 AM
Tiny
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I understand, unfortunately the crank sensor won't cause the RPM to be limited. It just tells the engine controller what the RPM's actually are. So that means we have another reason for the bogging down or limited RPM's.

Is it possible to get a video of what it is doing? It sounds like the vehicle is actually in limp mode.

Even though the check engine light is not on, can you check for codes and see if there are any there?

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing
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Saturday, July 25th, 2020 AT 5:37 PM
Tiny
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Okay, so I got a code reader from a friend and there’s no code at all and I drove it again trying to get the Engine light to come on and nothing. Could it be the fuel filter? A lot of videos online and my friend who is a mechanic the symptoms sound like it could be a fuel filter or the fuel pump. And a bad fuel filter won’t throw a code.
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Sunday, July 26th, 2020 AT 12:16 PM
Tiny
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And I was very low on gas when it happened.
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Sunday, July 26th, 2020 AT 12:22 PM
Tiny
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I took out the fuel pump clean the screen and the filter put it back in it works fine for his first shift from 1st to 2nd then it starts to act up.
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Sunday, July 26th, 2020 AT 3:59 PM
Tiny
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It is unlikely to be a fuel issue but I think we are missing something because if when this happens and the check engine light comes on then there will be codes. So the fact that you are not finding codes is odd. Is it possible to try and get to a parts store that offers pulling codes free of charge? It would be helpful to double check for codes because it is possible that the code reader is not compatible with this vehicle.
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Monday, July 27th, 2020 AT 4:38 PM
Tiny
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I can’t get the car to a auto parts store it won’t make it. I just put a new fuel pump and filter in because I got a good deal on it I know somebody and that didn’t work. My mechanic at work still thinks it’s a fuel issue is there an in-line filter on that car at all? I don’t have the equipment or the knowledge to go testing all the sensors. And the code reader I have is pretty much like what I’m going to find at an auto parts store it’s a craftsman. Maybe I should try driving it around until it throws a code. You know around the block. I can’t keep this up much longer I’ve been borrowing my truck from work and I’m bound to get into trouble.
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Friday, July 31st, 2020 AT 12:10 PM
Tiny
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I attached the info on the filter. If they think it is a fuel issue then lets check the fuel pressure to try and confirm this. Just because the pump is new doesn't mean it is operating properly. Was this issue happening before that was replaced?

Here is a guide on how test the fuel pressure:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Friday, July 31st, 2020 AT 5:52 PM
Tiny
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No i’ve had this kind of issue before and it was a sensor. Now I have a small light oil leak out of the back cylinder head. Are there any sensors down there that could be affected by a light oil leak? The leak is so light that I barely loses any oil. But I can smell it and I could see it steaming up from the back. Is there an O2 sensor down on that area or any kind of sensor that I could have blown?
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Friday, July 31st, 2020 AT 6:50 PM
Tiny
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But if any since it was blown wouldn’t show up on the check engine light.
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Friday, July 31st, 2020 AT 6:50 PM
Tiny
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A crank sensor may not show up on a check engine light but the engine would not start. As I stated before, the engine control module needs the crank sensor to determine what speed the engine is turning. If it doesn't not have this information then it will not start the engine. That is why I don't think this is a crank sensor.

It feels like we are jumping around to different issues. We need to actually start testing things so we can rule things out or get more info to what this could be. Let's start with checking the fuel pressure and go from there.
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Friday, July 31st, 2020 AT 8:15 PM
Tiny
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How do I check the fuel pressure? And is there an in-line filter on that car I can’t find it anywhere underneath?
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Saturday, August 1st, 2020 AT 2:01 AM
Tiny
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As you can see at start up in idle hour can get it going as soon as I start driving it loses it disconnected one of the sensors off the throttle body replaced it worked fine, go a half a block and then the videos that explain everything.
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Saturday, August 1st, 2020 AT 7:40 AM
Tiny
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I attached the info about the fuel filter. It is in the left front corner of the fuel tank.

This link will take you to a guide on how to check the pressure:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

As for the video, that could be a fuel issue so we need to start with checking these two things (filter and pressure). However, what I suspect earlier is a possible throttle sensor. The fact that you replaced removed it and plugged it back in seems like the PCM may have been learning the sensor again so it worked normal until it learned it and then it started acting up again a block later. Which specific sensor did you unplug? Can you get a picture of it?
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Sunday, August 2nd, 2020 AT 6:13 PM
Tiny
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I looked all underneath the car and I even called Hyundai service center and there’s no in-line filter on my car. As what I could see and as the service guy told me. I’ll look again and see if it’s tucked in somewhere.
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Monday, August 3rd, 2020 AT 4:25 AM
Tiny
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What are the two canisters off of the intake manifold? Are they catalytic converters? A lot of people are saying they could be clogged.
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Monday, August 3rd, 2020 AT 2:51 PM
Tiny
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The manual for a 2004 Santa Fe 2.7L says it is on the left front corner of the fuel tank. See attached. Unfortunately, I have to trust this info. If it is not there then you don't have one and the filter is in the tank on the pump.

I am not sure what the canisters are. Can you get a picture of them and I am sure I can identify them. Thanks
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Monday, August 3rd, 2020 AT 8:02 PM
Tiny
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I just tried to start it today I let it sit for a couple of days. It’s worse than ever and even stalled on me. Still no check engine light.
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Wednesday, August 5th, 2020 AT 3:11 PM
Tiny
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Okay. Thanks for the update, but we really need to start doing some testing or we are not going to make any progress. Have you checked the fuel pressure yet when this is happening? I don't have any other suggestions for you until we get new information. So we need to start with the fuel pressure when this happens.
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Wednesday, August 5th, 2020 AT 7:23 PM

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