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Old 04-06-2014, 08:13 PM   #1
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Default Vacuum Leak. Need help identifying part.

Working on my first A6 and can't figure out what this broken part is in the close up picture. it's toward the back of the engine on the right side of the intake manifold. The hose is totally broken right before it T's into another part... 2002 2.7T

Thanks!
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Old 04-06-2014, 08:29 PM   #2
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That hose could be coming from one of the turbos. Then going to the N75 (wastegate control solenoid) Valve. Without that pressure reading, your N75 valve will not allow you to boost properly because it's sensing a differential in pressures between the 2 turbos. I have a "MacGyver" post on fixing this exact thing. Except the "t" was broken and not the hose. If you have to replace the hose, good luck. She's tight down by the turbos….
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Old 04-06-2014, 11:22 PM   #3
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Thanks you.

Is that round part in the pic the N75, or something else? That end of the connection has the vacuum. it looks like the T is part of that round part? the hose looks intact, thankfully.
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Old 04-07-2014, 05:23 AM   #4
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its a 4way check valve
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Old 04-07-2014, 05:29 AM   #5
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here its is http://www.ecstuning.com/Audi-C5_A6-...lve/ES2649617/
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Old 04-07-2014, 07:02 AM   #6
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Awesome! I cross-referenced that part number and found it at AutohausAZ for $12. Not too bad!

Thanks guys!
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Old 04-07-2014, 07:03 AM   #7
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Boost401 is correct, it's the 4-way check valve that connects to the turbo recirculating valve (N249). I broke that very same check valve last week while removing my PCV system. You can order just the check valve if you want, but there is a vac hose that is heat-shrunk (or glued maybe?) to it that you will find difficult to remove from the broken part without cutting and reattaching to the new check valve.
I actually ended up ordering p/n 078-145-733-G, which is both the check valve and the attached vac hose. I got mine from ECS, though when I searched for the above complete part, it said it wasn't a match for my '04 2.7t... but it is. Here's a photo of old vs new:

Click the image to open in full size.

And a picture of the bag with p/n that it came in from ECS:

Click the image to open in full size.

You can find photos I took of it in my 2.7t here:
http://forums.audiworld.com/showthread.php?t=2863692

Cheers!
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Old 04-14-2014, 01:36 PM   #8
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Ah, that pesky plasticky hose... thanks to your advice here, i took a torch and lightly hit it with heat at the connection and the T slide right out. warmed it up again when installing the new T and it slide right in. Thanks!
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Old 04-14-2014, 01:36 PM
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