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Old 08-15-2017, 10:11 AM   #1
jeng
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Intake manifold vacuum connections

Hello everyone.

I'm getting ready to reinstall the intake manifold on the 2001 330ci coupe, manual transmission.

I know which hoses go to #1, #2 and #3.

But the two locations denoted by the arrows. I don't recall anything being connected to them, whatever they are. I'm under the impression that vacuum requires openings being sealed off - of which I could be mistaken. Or I might be correct. Not sure.

What are these two openings? Does anything get connected to them? Does anyone know? Thank you.
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Old 08-15-2017, 10:38 AM   #2
Vas
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Vacuum plugs go in those 2 holes. The two small ones are Part number 11611437560 and the larger one is Part number 11611727176
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Old 08-15-2017, 10:49 AM   #3
jfoj
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I believe the 2 areas that you have arrows pointing at without numbers are not vacuum ports, they are mounting bosses that should be blind and not enter the intake tube.

Take a piece of wire or a straightened out paper clip and check the depth. These holes should be blind.
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Old 08-15-2017, 10:50 AM   #4
TR4G-
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#1 gets plugged. #2 goes to the exhaust flap vacuum tank. #3 goes around the side to the secondary air pump.

Are you positive the two arrows are actually holes into the IM and not mounting points for something else?


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Old 08-15-2017, 12:54 PM   #5
jeng
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The holes are blind.

I stuck a pick into the hole and it did not go through into the intake chamber. Thank you for the idea to try that.

I'm getting ready to put everything back together and before I do I want to make sure that I'm not overlooking anything - like a vacuum leak of some sort. I'd be pretty annoyed if I didn't cap a hole that was supposed to be sealed.

Just trying to be thorough.

Thanks everyone.
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