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Diagram of crank and CAM sensor location and vacuum hose connections

Tiny
ROBERT ERWIN
  • MEMBER
  • 1993 NISSAN PATHFINDER
  • 3.0L
  • 6 CYL
  • AUTOMATIC
  • 100,000 MILES
Suspect bent valves but want to make sure every thing is connected. Replaced timing belt belt had missing teeth engine starts and runs but is rough. Does not make any metal on metal noise. If all connections are okay I will do compression test next.
Thursday, October 25th, 2018 AT 1:12 PM

10 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon.

Yes, I would perform a compression test on all cylinders. It does sound like you have valve damage from the failed belt.

Roy

https://www.2carpros.com/articles/how-to-test-engine-compression
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Thursday, October 25th, 2018 AT 3:24 PM
Tiny
ROBERT ERWIN
  • MEMBER
  • 18 POSTS
I still would like to know where the timing sensors are located and a diagram of the vacuum hoses.
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Thursday, October 25th, 2018 AT 3:32 PM
Tiny
ASEMASTER6371
  • MECHANIC
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Okay, sorry. You did not state that in your post.

I will get them for you but that will not cause a miss like you have at the moment.

Roy
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Thursday, October 25th, 2018 AT 3:36 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Attached is the wiring and vacuum diagram you requested.

As far as the crank and cam sensors, you have a distributor. This means there is no crank and cam sensors as the distributor serves as both.

Roy
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Thursday, October 25th, 2018 AT 3:41 PM
Tiny
ROBERT ERWIN
  • MEMBER
  • 18 POSTS
Probably not but would like to know for future reference. Thanks
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Thursday, October 25th, 2018 AT 3:42 PM
Tiny
ASEMASTER6371
  • MECHANIC
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I would start with a compression test to verify there no internal engine damage.

Roy

https://www.2carpros.com/articles/how-to-test-engine-compression
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Friday, October 26th, 2018 AT 2:19 PM
Tiny
ROBERT ERWIN
  • MEMBER
  • 18 POSTS
Number one cylinder 170 2. 0 3. 0 4.130 5. 140 6. 0. Please tell me how this engine starts and runs?
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Friday, October 26th, 2018 AT 6:17 PM
Tiny
ASEMASTER6371
  • MECHANIC
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Three out of six cylinders will allow it to run.

A leak down test needs to be done to determine if it is valves or a piston failure.

You will need major engine work.

Roy
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Saturday, October 27th, 2018 AT 6:09 PM
Tiny
ROBERT ERWIN
  • MEMBER
  • 18 POSTS
Can you explain a leak down test for cylinder with 0 compression? Do you mean run a wet test for compression? Thanks
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Saturday, October 27th, 2018 AT 7:47 PM
Tiny
ASEMASTER6371
  • MECHANIC
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No, you insert shop air into the cylinder through the spark plug hole and listen for the leak.

Out the exhaust is exhaust valve.
Out the intake or air filter intake valve.
Out the oil fill is a failed piston.
Out the radiator is a failed head gasket.

Roy
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Sunday, October 28th, 2018 AT 5:52 AM

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