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What is this threaded port by the distributor cap?

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Old Oct 11, 2025 | 05:52 PM
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Default What is this threaded port by the distributor cap?

I've pulled my engine to replace it (bad piston knock) and I'm seeing this open port next to the distributor. I'm assuming this must be where they'd stick an EGR on a 96 5.9 but I have no valve, so this must have been sucking dirty air forever!



Any help will be greatly appreciated!
 
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Old Oct 11, 2025 | 06:39 PM
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Thats your oil pressure sensor. You'll need a special socket for it unless you have a long enough deep well that doesn't have a short inner depth.

-edit- nevermind I assume you mean the port on your intake manifold, I have no idea. My 98 doesn't have that (I got rid of the stock manifold years ago)
 

Last edited by Tora; Oct 11, 2025 at 06:42 PM.
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Old Oct 11, 2025 | 06:47 PM
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Originally Posted by Tora
Thats your oil pressure sensor. You'll need a special socket for it unless you have a long enough deep well that doesn't have a short inner depth.

-edit- nevermind I assume you mean the port on your intake manifold, I have no idea. My 98 doesn't have that (I got rid of the stock manifold years ago)
Yeah, the manifold port. I'm livid this thing has been sucking dirty air through that thing for years without me knowing it
 
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Old Oct 11, 2025 | 06:48 PM
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What year is your ram?
 
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Old Oct 11, 2025 | 06:50 PM
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The Ram's a 99, but the motor came from a 96.
 
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Old Oct 11, 2025 | 06:59 PM
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If it's not for a egr valve, then I THINK that's a vacuum port and should have a screw in adapter? Does it look like your passenger side valve cover or anything else have a PVC valve pointing in that direction?

I'ma do some research real quick. I think got a ram teardown manual here somewhere, just got a find it
 

Last edited by Tora; Oct 11, 2025 at 07:08 PM.
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Old Oct 11, 2025 | 08:53 PM
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I have a 1996 5.9 magnum engine in my Dodge Ram 2500 4x4 and the EGR port on the intake doesn't have an EGR valve on it either. Seems as though Dodge was trying to use up their inventory of intake manifolds with the earlier EGR provision, however, I don't believe the EGR port functions. For it to work, you would need the threaded pipe that channels exhaust gases from the exhaust manifold to an EGR valve sitting on the intake. Since you don't have that, the port is non-functional.
 
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Old Oct 11, 2025 | 09:12 PM
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Originally Posted by AtomicDog
I have a 1996 5.9 magnum engine in my Dodge Ram 2500 4x4 and the EGR port on the intake doesn't have an EGR valve on it either. Seems as though Dodge was trying to use up their inventory of intake manifolds with the earlier EGR provision, however, I don't believe the EGR port functions. For it to work, you would need the threaded pipe that channels exhaust gases from the exhaust manifold to an EGR valve sitting on the intake. Since you don't have that, the port is non-functional.
I'll triple check that port to make sure it doesn't have an opening on the other end. It did seem WAY too clean to have an active opening to the intake.

I would figure a vacuum leak that strong would cause the entire to run like garbage right?
 
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Old Oct 11, 2025 | 10:12 PM
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If you are pointing at the large threaded hole to the right of the OPS, that is indeed for EGR. You can see the block-off plate where the valve would have been. 96 didn't use EGR, and my 96 2500 has that port, and the block-off plate as well. So long as the plate is there, and sealed properly, it isn't a problem.
 
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Old Oct 12, 2025 | 10:46 PM
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Originally Posted by Kidfrostd
Yeah, the manifold port. I'm livid this thing has been sucking dirty air through that thing for years without me knowing it

Your engine wouldn't run if it was open. Just an unused port. They show up from time to time over the years. Lots of openings that are either blocked off or never opened up.
 
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