CAM position sensor location?

Tiny
RGHESTER
  • MEMBER
  • 1999 CHEVROLET SILVERADO
  • 6.0L
  • V8
  • 4WD
  • AUTOMATIC
  • 170,000 MILES
Truck will not start every time/coughs (small backfire). Mechanic read diagnostic 'high voltage on or at cam sensor. Where is it located?
Sunday, December 10th, 2017 AT 5:43 PM

21 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,128 POSTS
Rear top of the engine. Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
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Monday, December 11th, 2017 AT 6:16 PM
Tiny
ASKEWDIVERGENT
  • MEMBER
  • 3 POSTS
  • 1999 CHEVROLET SILVERADO
V8 four wheel drive automatic 130,000 miles.

Where can I find the camshaft position sensor on a my truck listed above? It a 2500 5.7L engine. I would like to take the old one out so I can ensure that I have the right part before I order a new one. Thanks
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Monday, September 7th, 2020 AT 11:47 AM (Merged)
Tiny
BRIAN 1
  • MECHANIC
  • 1,030 POSTS
This cannot be a 5.7 they did not offer 5.7 in 1999. Only engines were 4.8, 5.3, 6.0 and 4.3. What is the eighth VIN number digit. Double check and post back and I will answer your question.
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Monday, September 7th, 2020 AT 11:47 AM (Merged)
Tiny
ASKEWDIVERGENT
  • MEMBER
  • 3 POSTS
My mistake, it is a 6.0 L, 8th VIN digit is U.

The check engine light has cleared, but the error code P-0343 is still in (tried clearing and is comes back).

GM parts direct gives me three different parts for the camshaft position sensor listed for my vehicle. Any ideas which is the right one?
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Monday, September 7th, 2020 AT 11:47 AM (Merged)
Tiny
BRIAN 1
  • MECHANIC
  • 1,030 POSTS
Could try calling the dealer and they could give you the part number. The camshaft position sensor is located at the back top part of the engine block, directly behind the intake manifold. Post back with any other questions.
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Monday, September 7th, 2020 AT 11:47 AM (Merged)
Tiny
BRIAN 1
  • MECHANIC
  • 1,030 POSTS


https://www.2carpros.com/forum/automotive_pictures/147643_cam_1.jpg

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Monday, September 7th, 2020 AT 11:47 AM (Merged)
Tiny
RENETTAJ
  • MEMBER
  • 1 POST
  • 1999 CHEVROLET SILVERADO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
Truck was hesitating as you accelerated, then would shut down like it ran out of gas after driving a couple of miles, only to start again minutes later. I was told to replace:
coolant sensor, camshaft sensor, crankshaft sensor, spark plugs, and to adjust the timing. Having done this, the truck turns over but doesn't start. Any ideas? I am at the end of my rope. Many Thanks, Renetta
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Monday, September 7th, 2020 AT 11:47 AM (Merged)
Tiny
LGCASA
  • MEMBER
  • 5 POSTS
Yes, they offered a 5.7 in 1999 It is in the distributor. Pull cap pull rotor that piece that the plug is plugged into is the cam sensor. Chevrolet did not know were else to put it at the time. The 5.7 is in 4x4 and 3/4 HD pu and 1 ton vans.
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Monday, September 7th, 2020 AT 11:47 AM (Merged)
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
Don't know why you were requested to replace all the parts. You will have to start with the basics at this point, and what is causing it not to start. Check for spark on one or more plugs, and check for fuel pressure of 55-60 psi.
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Monday, September 7th, 2020 AT 11:47 AM (Merged)
Tiny
SNAKE69
  • MEMBER
  • 2 POSTS
  • 1997 CHEVROLET SILVERADO
Electrical problem
1997 Chevy Silverado V8 Four Wheel Drive Automatic

where is the camshaft sensor located
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Monday, September 7th, 2020 AT 11:48 AM (Merged)
Tiny
IMPALASS
  • MECHANIC
  • 3,112 POSTS
Hello

First, to better assist you I need to know if this is your specific vehicle, is it a 1500, 2500 etc, and your specific engine by liter. Example is it a 5.4L 6.0L 7.3L etc gas or DSL and what is the 8th digit of your VIN.
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Monday, September 7th, 2020 AT 11:48 AM (Merged)
Tiny
SNAKE69
  • MEMBER
  • 2 POSTS
It is a 1997 z71 4x4 it has a 5.7L
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Monday, September 7th, 2020 AT 11:48 AM (Merged)
Tiny
IMPALASS
  • MECHANIC
  • 3,112 POSTS
Hello


https://www.2carpros.com/forum/automotive_pictures/248015_1_49.jpg

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Monday, September 7th, 2020 AT 11:48 AM (Merged)
Tiny
WFIELD322
  • MEMBER
  • 4 POSTS
  • 1996 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 143,000 MILES
Since I have owned the truck it has gotten crappy gas milage so I have been trying to do some small thing to help that. I have done a tune up, flushed engine, and changed all filters more than once. I took it to see if there were any dtc's last week and it came up with "camshaft to crankshaft postion coralation fault" now I don't know exactly what the means but it sounded like it was either the cam and crank sensors or the timing chain. So I took the easier option first. The sensors. The truck was running before but afterwards it would not run. I took it back out and put the old one back in and it would still not run. It turns over but acts like there is no spark, but I know all the wires are in the right spot, there is spark and it has good compression. I need to get this fixed asap so any help would be great.
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Monday, September 7th, 2020 AT 11:48 AM (Merged)
Tiny
JETSA
  • MEMBER
  • 117 POSTS
That code usually indicated camshaft retard timing is off. The distributor is supposed to be set at 0 degrees +/- 8 degrees. Anything above or below that will set that code. Usually the only way the timing gets out of specs is when the distributor has been removed and reinstalled incorrectly (usually after an intake manifold gasket replacement job). You need a scanner to read camshaft retard to see how far off it is. If it is at 34 (I think thats the max), usually a fuse is blown. Check the Engine1 fuse and the ECM1 fuse in the underhood fuse block for being blown.

EDIT:Forgot. Also while your at it, pull the distributor cap and grab the rotor and try moving it side to side. There should be little to no side to side movement. If there is any, the distributor bushing is worn out and the distributor needs to be replaced.
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Monday, September 7th, 2020 AT 11:48 AM (Merged)
Tiny
WFIELD322
  • MEMBER
  • 4 POSTS
The fuses were all fine and the distributor it squre to the back of the firewall and we have not touched the distributor. Just the cap rotor and the sensor. There is maybe an eigth inch of movment if you turn it and about the same if you pull up.
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Monday, September 7th, 2020 AT 11:48 AM (Merged)
Tiny
JETSA
  • MEMBER
  • 117 POSTS
What about side to side movement while grabbing the rotor? Not turning it or pulling up on it. Basically you have a round shaft with a bushing around it to keep it from moving side to side. If this bushing wears out, then you will be able to move the rotor which is attached to the shaft and this is no good.
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Monday, September 7th, 2020 AT 11:48 AM (Merged)
Tiny
WFIELD322
  • MEMBER
  • 4 POSTS
Well I did not notice any side to side movment but I will check for sure. If there is should I take it to somone who has a computer to check the timing to put a new distributor in it? And should I go have the timing checked if it doesn't? Would something lke this make bad gas milage?
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Monday, September 7th, 2020 AT 11:48 AM (Merged)
Tiny
JETSA
  • MEMBER
  • 117 POSTS
Well, if you are mechanically inclined we can work through the installation here, but eventually you will need someone with a scanner to read the camshaft retard to make sure the installation is correct.

The truck you have isnt going to get anywhere near great fuel mileage. 4wd doesnt help much with gas mileage.
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Monday, September 7th, 2020 AT 11:48 AM (Merged)
Tiny
WFIELD322
  • MEMBER
  • 4 POSTS
Well I am know I can put the distributor in I just dont have the time. I have a friend with the same exact truck who can get 20 an the highway. When I said bad I meant close to 10/gal. It also will not pull a trailer to save its life.
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Monday, September 7th, 2020 AT 11:48 AM (Merged)

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