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Feb 3, 2017 | 09:08 PM

#31

madpogue

Lead Driver

Joined: Oct 2003

Posts: 8,476

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From: Madison, WI

Quote:

Originally Posted by Shawn MacAnanny

did you drill the fitting in the manifold? My Fitting in the manifold was clogged

This is what happened on one of our trucks.

Feb 3, 2017 | 10:36 PM

#32

oldbird1965

Fleet Owner

Joined: Aug 2004

Posts: 20,419

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From: AZ

I cleaned my tube but never checked that

Edit: I don't mean that tube!

Feb 4, 2017 | 07:02 AM

#33

knottyrope

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Joined: Apr 2016

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From: Bahstun

Quote:

Originally Posted by oldbird1965

I cleaned my tube but never checked that

Edit: I don't mean that tube!

did you check to see if the sensor was clogged?

I rammed a coat hanger rod in the hole to make sure the exhaust would come through. It was tight but I got it done.

Feb 4, 2017 | 08:27 AM

#34

oldbird1965

Fleet Owner

Joined: Aug 2004

Posts: 20,419

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From: AZ

Its a new sensor but I'm going to have to check the manifold.

Feb 4, 2017 | 09:54 AM

#35

Jarrett Campbell

Thread Starter

Cargo Master

Joined: Jul 2015

Posts: 3,076

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From: Aransas Pass, Tx

Since the pressure is changing, wouldn't that indicate that the passage is clear (or clear enough to allow air flow)? I think I have a bad sensor.

Feb 4, 2017 | 10:16 AM

#36

madpogue

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Joined: Oct 2003

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From: Madison, WI

I had that ^^^^ same thought, if the sensor is responding, the passage is obviously not completely plugged. This is a reach, and complete speculation, but MAYBE it's partly restricted, right at the manifold fitting as Shawn described, and the restriction is causing the pressure to read higher (smaller opening == higher pressure maybe?).

Feb 4, 2017 | 10:39 AM

#37

Jarrett Campbell

Thread Starter

Cargo Master

Joined: Jul 2015

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Likes: 21

From: Aransas Pass, Tx

I don't think that is the case since it reads more pressure than it should when the truck is not running (even though the same concept did cross my mind)

Also, a restriction wouldn't cause more pressure, it would cause more velocity.... or less volume.

Feb 4, 2017 | 10:42 AM

#38

madpogue

Lead Driver

Joined: Oct 2003

Posts: 8,476

Likes: 37

From: Madison, WI

Well I know when mine was completely clogged, the sensor read higher than atmospheric pressure until I unclogged the fitting. But that may have been remaining pressure trapped in the pipe.