It doesn't appear in any of the engine diagrams I can find.
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01-25-2021
It doesn't appear in any of the engine diagrams I can find.
01-25-2021
Also, what is supposed to attach to this fitting? We can't find a hose attached to it on either engine. Not getting any vacuum leak codes...
01-25-2021
ive got a 5.3 in my tahoe, so not exactly the same set up, but my vac line from the top of the intake goes to a valve cover's pcv valve. its where you would install a catch can. between that line.
that other line looks fat enough to be evap related. im not even sure where im looking either in that pic.
01-26-2021
It doesn't go into a valve cover, it's in the valley between them. The second picture is below and to the left of the throttle body.
01-28-2021
Many LS engines have the PCV line into the valley cover and not the valve covers. But the LS4 should have a tube coming out of the rear valve cover that the PCV hose goes into.
The port on the intake manifold is likely another port used in a different applications. If you can put your finger over it and there is no air being sucked in, that port is blocked. My guess is that it's a PCV or EVAP line connection that just isn't used.
01-29-2021
I cannot, of course, nail down the part number on the PCV hose for the LS4. However, every hose I can find is rubber or plastic. This thing is metal.
02-04-2021
On my 08 that part is original and plastic, it goes to the port on the rear valve cover. The second picture that is a dummy post, nothing goes there and it has no vacuum.
02-05-2021
Thank you, but what is it called, so I can order another one?
02-05-2021
You will have to contact a GM dealership directly for that.
The vehicle is over 10 years old and they don't have to make parts for it anymore. I don't see it listed on GM parts direct anymore so if there is a part number for that part, it's new old stock. They would have a complete parts list breakdown for it.
Or just do what anyone else would do and buy a piece of rubber hose to make a new one if you needed to do that.
02-11-2021
No luck. I ordered that. It's black plastic and connects to the MAF sensor, not the engine. The one I have is just fine.
Anyone else?
02-13-2021
ENGINE ASM-5.3L V8 PART 2 CYLINDER HEAD AND RELATED PARTS
As I said it's plastic on my car, the part I gave you is what is listed as it goes to the rear valve cover . If you have not owned the car since new chances are it's been replaced, possibly with a part from a truck or some other doner vehicle. It's not available so used or custom fit a new piece is your choice of repair.
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