Thread: Can Someone Identify the Blue Part on Top of the Engine?

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  1. #1 Can Someone Identify the Blue Part on Top of the Engine? 
    GT Level Member Hurricane87's Avatar
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    It doesn't appear in any of the engine diagrams I can find.Can Someone Identify the Blue Part on Top of the Engine?-ls4part-jpg
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  2. #2 Re: Can Someone Identify the Blue Part on Top of the Engine? 
    GT Level Member Hurricane87's Avatar
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    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...Can Someone Identify the Blue Part on Top of the Engine?-ls4part2-jpg
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  3. #3 Re: Can Someone Identify the Blue Part on Top of the Engine? 
    Killa Bee Scottydoggs's Avatar
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    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.

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  4. #4 Re: Can Someone Identify the Blue Part on Top of the Engine? 
    GT Level Member Hurricane87's Avatar
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    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.
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  5. #5 Re: Can Someone Identify the Blue Part on Top of the Engine? 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    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.

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  6. #6 Re: Can Someone Identify the Blue Part on Top of the Engine? 
    GT Level Member Hurricane87's Avatar
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    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.
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  7. #7 Re: Can Someone Identify the Blue Part on Top of the Engine? 
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    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.
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  8. #8 Re: Can Someone Identify the Blue Part on Top of the Engine? 
    GT Level Member Hurricane87's Avatar
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    Thank you, but what is it called, so I can order another one?
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  9. #9 Re: Can Someone Identify the Blue Part on Top of the Engine? 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    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.

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  10. #10 Re: Can Someone Identify the Blue Part on Top of the Engine? 
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  11. #11 Re: Can Someone Identify the Blue Part on Top of the Engine? 
    GT Level Member Hurricane87's Avatar
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    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?
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  12. #12 Re: Can Someone Identify the Blue Part on Top of the Engine? 
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    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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