what is this? between manifold and intake (post MAF)
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This is a discussion on what is this? between manifold and intake (post MAF) within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; OK, this is probably a very noob question, but before I get flamed, could someone answer this question ? there ...

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    what is this? between manifold and intake (post MAF)

    OK, this is probably a very noob question, but before I get flamed, could someone answer this question ?

    there is a small "device" that connects the manifold directly to the intake (post MAF), and I can't seem to determine its function. I know it's not the BPV and the only thing I can think is that it's related to the boost pressure gauge. Someone let me know!!
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    Moderator Donkey's Avatar
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    Its a one way valve for the EVAP system...................
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    Quote Originally Posted by Donkey View Post
    Its a one way valve for the EVAP system...................
    So that's the purge valve for the EVAP sysetm? Good to know. Thanks Donkey!
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    Boost > NA itWRXjustfine's Avatar
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    If this valve is functioning properly, would you throw a P0442?
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    Moderator Donkey's Avatar
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    Quote Originally Posted by zax View Post
    So that's the purge valve for the EVAP sysetm? Good to know. Thanks Donkey!
    Well the actual purge valve is the electronic solenoid bolted to the manifold right under that. It should be plumbed inline right before the one way valve.
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    Moderator Donkey's Avatar
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    Quote Originally Posted by itWRXjustfine View Post
    If this valve is functioning properly, would you throw a P0442?
    Yes as there are a couple of other valves in the system. There are actually two solenoid controlled purge valves. One at the charcoal canister and one at the manifold.

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    Quote Originally Posted by Donkey View Post
    Well the actual purge valve is the electronic solenoid bolted to the manifold right under that. It should be plumbed inline right before the one way valve.
    If my limited knowledge of the EVAP control system is correct, shouldn't the valve be attached to a charcoal storage container ... but why does it run back into the intake?
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    Moderator Donkey's Avatar
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    Quote Originally Posted by zax View Post
    If my limited knowledge of the EVAP control system is correct, shouldn't the valve be attached to a charcoal storage container ... but why does it run back into the intake?
    Because the manifold vacuum is what is used to transfer the gasoline vapors from the gas tank to the combustion chamber. This method has only been used since the 1970's...... Not to mention I provided everyone with a link the factory manual diagrams. Maybe take a look at those first.
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    Quote Originally Posted by Donkey View Post
    Because the manifold vacuum is what is used to transfer the gasoline vapors from the gas tank to the combustion chamber. This method has only been used since the 1970's...... Not to mention I provided everyone with a link the factory manual diagrams. Maybe take a look at those first.
    Ah, yes you did. Didn't even see the link to the service manual. Taking a look now...
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