Crankshaft position sensor replacement?

Tiny
DOMAINCO
  • MEMBER
  • 3 POSTS
I've located it already and have successfully changed it however it is in a extremly hard to reach location, figure at least 3-4 hours of work
Thank you guys so much for your help
(free help ) it's nice to know some people are still out to help others and not trying to extort them for more money

I'll be making that donation to you guy's shortly

Best regards
Dennis francavilla
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Friday, February 5th, 2021 AT 11:14 AM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Thanks for the donation.
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Friday, February 5th, 2021 AT 11:14 AM (Merged)
Tiny
TOMATER
  • MEMBER
  • 2 POSTS
  • 1999 GMC SIERRA
  • 80,000 MILES
What does the crank sensor look like on my truck? Where is it located?
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Friday, February 5th, 2021 AT 11:14 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Goggle it for description-pick ur liter below

Crankshaft Position (CKP) Sensor (4.3L VIN W)On bottom front of engine, near crank pulley.
Crankshaft Position (CKP) Sensor (4.8L VIN V)On lower right rear of engine block..
Crankshaft Position (CKP) Sensor (5.3L VIN T)On lower right rear of engine block.
Crankshaft Position (CKP) Sensor (6.0L VIN U)On lower right rear of engine block.
Crankshaft Position (CKP) Sensor (6.5L VIN F)On bottom front of engine, near crank pulley.
Crankshaft Position (CKP) Sensor (6.5L VIN S)On bottom front of engine, near crank pulley
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Friday, February 5th, 2021 AT 11:14 AM (Merged)
Tiny
DGILSTRAP
  • MEMBER
  • 1 POST
  • 1999 GMC SIERRA
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 287,000 MILES
Did complete tune up, replaced plugs, plug wires, distributor, rotor an fuel pump. Ran great for three months and started doing the same thing. Hooked it up to a computer and the computer is saying crank shaft sensor. Replaced it with no better results. After completing all of the above, now the mechanic is telling me the crank sensor is showing damage from the crank hitting it and the engine is worn out. This has been a great truck for the last seventeen years. I have taken very care of it and wanted to make sure the mechanic is right.
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Friday, February 5th, 2021 AT 11:14 AM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
Yes the crankshaft can be hitting the sensor as the crankshaft starts to move around with the higher mileage, but I would just use a small washer under the sensor mounting bolt which will give the sensor more clearance. Is the engine making noise?

Please let us know

Cheers, Ken
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Friday, February 5th, 2021 AT 11:14 AM (Merged)
Tiny
ALGRUB
  • MEMBER
  • 4 POSTS
  • 1998 GMC SIERRA
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 300,000 MILES
Where is ckp sensor located on this truck? I can find info up to a 97 or 99 up, but I can't find anything on a 98.
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Friday, February 5th, 2021 AT 11:14 AM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
It's behind the harmonic balancer on the front of the engine

https://www.2carpros.com/images/external/86415972.jpg.gif
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Friday, February 5th, 2021 AT 11:14 AM (Merged)
Tiny
EDNUS70
  • MEMBER
  • 1 POST
  • 1996 GMC SIERRA
Where is the crankshaft sensor locate
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Friday, February 5th, 2021 AT 11:14 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Crankshaft Position Sensor

Engine Side, RH


https://www.2carpros.com/forum/automotive_pictures/12900_crankshaft_1.jpg

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Friday, February 5th, 2021 AT 11:14 AM (Merged)
Tiny
HYDRO630
  • MEMBER
  • 2 POSTS
  • 1995 GMC SIERRA
  • 65,000 MILES
Cranks but no start, tried squirting fuel in throttle body no fire.
Pulled plug, grounded and cranked, no spark. Replaced ign. Coil, ign. Control module, cap & rotor, coolant temp sensor & fuel pump relay, no start. Read that crank position sensor triggers the coil and fuel pump for start & run.

Question is: Where is the crank position sensor located on this vehicle, looked all around front of engine crank damper & could not find, could this be located by the flywheel and is this my last resort?
Any help appreciated.
Thanks.
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Friday, February 5th, 2021 AT 11:14 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Hi,

The crank sensor is located mounted in the engine block.

Here is a guide and video on how to replace it:

https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

As far as the no spark, have you checked to see if there is power to the coil? Also, 95 was a while ago. Do you have coil packs mounted on a digital ignition controller (DIC), a coil over for each cylinder... Please explain. The DIC is known to go bad and cause a no spark situation. The DIC is what the coil packs mount to.
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Friday, February 5th, 2021 AT 11:14 AM (Merged)
Tiny
HYDRO630
  • MEMBER
  • 2 POSTS
Thanks for the information, I replace the sensor now the truck starts up great! Thanks 2CarPros! You guys are the best!
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+4
Friday, February 5th, 2021 AT 11:14 AM (Merged)
Tiny
KINGNQUEEN0526
  • MEMBER
  • 18 POSTS
Tiny
SEVAG PAESEGHIAN,
Hello again sir. I can finally bring you back you back up to speed again with my crank sensor issue on my 2003 GMC Sierra 2500hd 4x4.
Now that I have been able to get some good time on the truck to really be able to dig deep into the diagnosing stage without freezing the gonads I was able to determine that the signal wire from the CKP to the PCM was broken and brittle for about two feet in numerous places from the sensor to the PCM and was the whole issue of the situation.
Needless to say that during the situation of the diagnosing I replaced the CKP sensor the CMP sensor the map sensor and the pcv valve. While all of this was being replaced I had the PCM disconnected and out of the vehicle because of trying not to short anything out and looking at the board to make sure it wasn't fried.
After everything was said and done I repaired the wiring then hooked the computer back up hooked the battery back up and tested my wires. Good signal at 5 volts good power and ground at 12 volts. Tried to start motor and fired right up.
Problem that I'm having now is that it runs rough and is backfiring through the throttle body. It's giving me a p0170 map sensor code and a p0334 PCM code. Research says that CMP sensor is not meeting the voltage requirements and that is causing the issue. When I'm driving the truck it runs good but at idle it's rough and when I try to get on it it falls on it's face and backfires a couple times then will pick up speed. Runs at idle like she's got a big cam lobe going on.
Just wanting to see what your thoughts might be and what you might suggest. Really wanting to get her running right. Got some mud runs looking forward to getting into this year.
Thanks SEVAG really appreciate ya.
Bruce
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Thursday, April 1st, 2021 AT 10:18 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Hi,

What size engine does this have? As far as the idle, that could be a fuel-related issue or even a vacuum leak.

Let me know the engine size so I can focus on the codes.

Let me know.

Joe
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Sunday, April 4th, 2021 AT 9:05 PM
Tiny
KINGNQUEEN0526
  • MEMBER
  • 18 POSTS
Hello Joe. My truck is powered by the 6.0l vortec gas distributorless motor. There is a lot of insight in this forum concerning the vehicle itself snd what has gotten me to where I am now. Starting from the very 1st issue up to present.
Thank you for your interest and advice that may come.
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Monday, April 5th, 2021 AT 12:22 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Hi,

Do me a favor. On the front of the engine (driver's side) almost about as low as the oil pan is a ground for the coils. They are known to fail. Check the condition of it. Make sure the connector is good and make sure there isn't a corrosion issue.

The interesting thing is that ground is for all of the coils. If it is weak, it can cause all kinds of different problems.

Let me know.

Joe
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Monday, April 5th, 2021 AT 6:06 PM
Tiny
KINGNQUEEN0526
  • MEMBER
  • 18 POSTS
Hello again Joe.

That ground was one of the very 1st wires that I checked after replacing the CKP and cmp sensors with no change. There was a short piece of the wire that was bad close to the connection at the motor. Did a repair and started getting good ground voltage. Still had the no spark issue. Started testing wires from CKP to PCM and that's when I found the signal wire from CKP was brittle and broken in numerous places through the harness up to about the front lower part of the motor (under crank pulley). Repaired that and truck fired up. Motor ran fine for a few minutes then started backfiring and having a very rough idle. Kicked codes for the MAO and com. Did research and found that PCM code was kicked because of the MAP code.
Bruce
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Tuesday, April 6th, 2021 AT 4:44 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Hi,

When I look up the codes, I'm seeing different definitions. The P0334 is for a knock sensor and the 170 is for a fuel trim issue. Note that a rich fuel mixture can cause a backfiring issue.

Also, the knock sensor fine-tunes ignition timing. I don't think it could get far enough off to cause a backfire, but it certainly can cause valve ping.

Do you have a live data scanner? If you do, let me know what the short-term fuel trims are at idle. Take a look through this link as well.

https://www.2carpros.com/articles/engine-backfires-while-running

As far as the knock sensors, they are under the intake manifold. If you had dry brittle wires from the PCM, these could have the same problem because of location. The see a lot of heat.

If you look at the attachments below, I included the directions for removal and replacement. At least check the condition of the wires.

I'm really interested in knowing the fuel trims. You could have an intake leak, O2 sensor issue, fuel pressure issue, the canister purge valve could be stuck open, and so on.

Let me know.

Joe
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Tuesday, April 6th, 2021 AT 6:13 PM
Tiny
KINGNQUEEN0526
  • MEMBER
  • 18 POSTS
Hello again Joe,

First I have to apologize for the typos that were made in my latest correspondence. The codes that were listed were not what was meant to be there.
However the codes that I do have are the p0106 and p0342. 106 being the map sensor code and 342 being the PCM code.
When I looked these codes up the 106 is telling me that there is a low or short circuit being read from the MAP sensor. The 342 code tells me that it is caused because of the CMP sensor is sending an or otherwise outside the manufacturer's settings.
As for the knock sensor code. I haven't had that code come up again since the time that I couldn't get the truck to start again. Now that I have been able to get it running that code has not came back.
I do not have access to a scanner with the ability to do live scan or anything like that. I used to have access to a scanner with that ability a couple of years when I worked in a shop for approximately 15 years. But I quit from there about 2 years ago and now I just stay at home for the most part when not out being able to enjoy the mud.
With those knock sensors. Checking the wires with a multimeter should I get a voltage reading a ground reading or a signal reading? And of what values would these readings be?
Again I apologize for the typos that were made.
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Thursday, April 8th, 2021 AT 6:12 PM

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