Can someone tell me where this vac line goes?

GNX423 · 01-24-2019, 06:11 PM

Good day all, recently completed a engine swap after the original N20 self-destructed. All is back together but have no idea where this line is supposed to go. I think it is for the exhaust flap in the muffler, but something has to control it. There is a 'T' on the main vac line from the vac pump to the engine cover reserve tank, but it has a factory plug over it.

Any help is appreciated!

Thanks,
Mike

GNX423 · 01-28-2019, 07:17 PM

Well, if anyone is doing an oil change or poking around under the hood and can let me know, I would appreciate it.

Mike

BIG_KID · 01-28-2019, 07:34 PM

I can't help but I did just notice your name. Do you own GNX #423

pchansen · 02-02-2019, 11:46 AM

That is the vacuum line to the butterfly valve in the muffler that closes off the outside (left) pipe on cold start. Plug it. It's of no use. It just adds to the possibility of a vacuum leak somewhere in the system that will eventually lead to the dreaded "Powertrain Fault" indication when there is not enough vacuum to operate the wastegate. Ask me how I know.

01-24-2019, 06:11 PM	#1
GNX423 New Member 9 Rep 20 Posts Drives: 2013 X3 28xi Join Date: Jan 2019 Location: Central NJ iTrader: (0)	Can someone tell me where this vac line goes? Good day all, recently completed a engine swap after the original N20 self-destructed. All is back together but have no idea where this line is supposed to go. I think it is for the exhaust flap in the muffler, but something has to control it. There is a 'T' on the main vac line from the vac pump to the engine cover reserve tank, but it has a factory plug over it. Any help is appreciated! Thanks, Mike Attached Images
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01-28-2019, 07:17 PM	#2
GNX423 New Member 9 Rep 20 Posts Drives: 2013 X3 28xi Join Date: Jan 2019 Location: Central NJ iTrader: (0)	Well, if anyone is doing an oil change or poking around under the hood and can let me know, I would appreciate it. Mike
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01-28-2019, 07:34 PM	#3
BIG_KID Second Lieutenant 68 Rep 290 Posts Drives: 2011 X3 28i Join Date: Dec 2017 Location: Northern indiana iTrader: (0)	I can't help but I did just notice your name. Do you own GNX #423
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02-02-2019, 11:46 AM	#4
pchansen Private 27 Rep 98 Posts Drives: 19 X7 50i13%C2%92 X328i Join Date: Feb 2019 Location: PacNW iTrader: (0)	That is the vacuum line to the butterfly valve in the muffler that closes off the outside (left) pipe on cold start. Plug it. It's of no use. It just adds to the possibility of a vacuum leak somewhere in the system that will eventually lead to the dreaded "Powertrain Fault" indication when there is not enough vacuum to operate the wastegate. Ask me how I know.
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