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Old 09-10-2019, 06:31 AM
lyleswk lyleswk is offline
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Vacuum Lines from Cosmetic Cover

There are 2 vacuum lines that come from underneath the cosmetic cover on the N20 engine on the passenger side that go to something hidden by a sealed cover on the backside of the cover. One goes to the boost controller, the other goes to the back of the engine. Does anyone know what is under the sealed cover?
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Old 09-10-2019, 06:41 AM
Rebound Rebound is offline
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Vacuum Lines from Cosmetic Cover

On the N55, it’s the engine’s PCV valve.

Here’s a link to a video which shows an oil catch can install on an N20. These cans “catch” the oil vapor from a PCV, preventing it from entering the intake. See if this video describes the lines you’re describing.


Last edited by Rebound; 09-10-2019 at 09:41 AM.
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Old 09-10-2019, 11:07 AM
lyleswk lyleswk is offline
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Not the one's I'm referring to. These are are pinky sized lines right above the turbo on the N20 coming out of the bottom of cosmetic cover. I'll take a picture and post tomorrow.

Last edited by lyleswk; 09-10-2019 at 12:05 PM.
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Old 09-11-2019, 05:05 AM
lyleswk lyleswk is offline
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Old 09-11-2019, 08:48 AM
Rebound Rebound is offline
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I haven’t worked on that engine, but I downloaded the tech guide for the engine. I think that if you remove the beauty cover, you’ll see all of it, and it’s diagrammed below.

So one hose feeds back into the vac unit, and the other routes to the vacuum unit of the wastegate valve. But you’re only seeing half of the vac system because the beauty cover hides the rest.

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Old 09-11-2019, 10:09 AM
lyleswk lyleswk is offline
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That's perfect, thanks. Appears to be a vacuum reservoir. I just had quit a bit of oil coming out of it. Any one else noticed that? Certainly don't want to chase something normal.
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