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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E46 (1999 - 2006)

E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 02-28-2012, 04:44 PM
glhx glhx is offline
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Location: tennessee
 
Join Date: Jan 2012
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Mein Auto: bmw 330ci
Vacuum leak pinpointed at SAP... electric valve...????

i found a huge vacuum leak that i cannot fix i think without removing the intake....not exactly sure what is leaking.

the cigar test pinpointed it to the electric valve under the intake that goes to some sort of solenoid that connects to a 1 way check valve...not sure what this is yet...in the diagram it goes to the sap but on my 330ci it doesnt. I connected a 3 foot vacuum line to where the SAP would connect to in the back of the intake....forced smoke through the hose...the smoke showed me it was by that valve. Then used compressed air to pinpoint close to the location as i could

The leak is next to the plug that goes to that electric valve (#5 in the picture in the link with the parts diagram ) the rectangular box. I dont know of any hoses there. its like its coming from in between the plug and the intake. Is there a gasket there that connects that electric valve to the intake manifold. There is no vacuum port on the top of the electric valve like it shows in the picture on my car. But the leak is really close to the plug anyway

What could this be?

Last edited by glhx; 02-28-2012 at 06:41 PM.
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  #2  
Old 02-28-2012, 05:54 PM
glhx glhx is offline
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Mein Auto: bmw 330ci
the red is where im pretty sure the leak is...but what could be leaking there....surely its not a cracked intake
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Last edited by glhx; 02-28-2012 at 06:18 PM.
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  #3  
Old 02-29-2012, 05:08 AM
glhx glhx is offline
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Location: tennessee
 
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Mein Auto: bmw 330ci
on another forum i found out that when the car is off the SAP control box under the intake is open to purge air. I thought this was a vacuum leak. when i forced smoke into it...the smoke just came out that solenoid
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  #4  
Old 02-29-2012, 04:24 PM
Jimmys 530i Jimmys 530i is offline
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Location: Conyers, GA
 
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Mein Auto: 2003 530i
I would check the hose that is in the green box to the left, it is a common place for vacuum leaks. I have not seen a SAP vacuum regulator leak though.
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