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E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #1  
Old 03-18-2015, 07:58 AM
mojo9430 mojo9430 is offline
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Location: Lone Tree, Iowa
 
Join Date: Mar 2015
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Mein Auto: 1994 BMW 318is
Question Vacuum box question...

Hi,
So, I was replacing vacuum lines on my '94 318is (they were all pretty much crumbling or cracked), and I attempted to remove the one for the vacuum box. It broke off up inside the plastic part of the diaphragm housing. Since I had to go to work, I just capped off the vacuum. My question is, what exactly does this control, and will it affect anything by having it capped off? It seems to run fine without it... I did a search for this and can't find anything covering this part.

Thanks...
[IMG][/IMG]

Last edited by mojo9430; 03-18-2015 at 08:12 AM.
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Old 03-18-2015, 08:22 AM
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hornhospital hornhospital is offline
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Mein Auto: E24x2,E36x2,E30x1, F150
It controls the DISA valve. You probably haven't run it above 4800 rpm yet with a wide open throttle. On my 318, there's a distinct jump in power about 4800 when the DISA valve does the change-over from long runner intake to short runner. It won't hurt to run it without the actuator connected, but you're giving up some horsepower at the top end.
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Old 03-18-2015, 08:26 AM
mojo9430 mojo9430 is offline
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Location: Lone Tree, Iowa
 
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Mein Auto: 1994 BMW 318is
Ahhh, ok... I will try to get that off and get that broken piece of tubing out so I can hook it back up... Thanks so much!
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