Advice needed: AA Bov not blowing

zaheer · 05-28-2012, 04:51 AM

Hey guys,

Over the weekend, I installed my AA bov to my stock 335. Once everything was installed, tried it for the first time, no blow off happened. I could see the valve inside moving when revved but no blow off.

So I took it for a drive when warmed up, no blowing off on any gear changes at all, no error mesages on the dash, car driving exactly as before installed. Tried revving to 6k before changing gears and heard a little blow off however hardly noticeable.

What could be the issue here? the vacuum line is going to the T from the factory line, where one side is capped off (as I did not want to break the nipple on the intake manifold when installing). Do you think I have a leak somewhere?

At idle, the bov doesnt seem to be puffing air, and I can hear a very slight hissing noise from somewhere. this also normal?

I can upload a video if that helps identifying the problem.

Themythx · 05-28-2012, 08:22 AM

My guess is if you hear a hissing you might have a leak somewhere.....

MilehighM3 · 05-28-2012, 08:54 AM

There are 2 nipples on the AA bov typically. Do you have the vacuum line hooked to the top or the bottom? Should be on the top fitting.

zaheer · 05-28-2012, 09:07 AM

Quote:

Originally Posted by Bmw135er

There are 2 nipples on the AA bov typically. Do you have the vacuum line hooked to the top or the bottom? Should be on the top fitting.

Yes, it is connected to the top one. However if I had a leak, would it not show an engine light on the dash?

NY135ivishnu · 05-28-2012, 09:12 AM

Quote:

Originally Posted by zaheer

Quote:

Originally Posted by Bmw135er

There are 2 nipples on the AA bov typically. Do you have the vacuum line hooked to the top or the bottom? Should be on the top fitting.

Yes, it is connected to the top one. However if I had a leak, would it not show an engine light on the dash?

No. Did you purchase the bov specific to your car ?

Did you purchase it with a charge pipe ?

Bov have different lb. springs of you got universal one make sure you have the correct spring for your car. I'm not sure what bmw vacume pressure is. My supra used a 10lb.

zaheer · 05-28-2012, 10:56 AM

Quote:

Originally Posted by NY135ivishnu

No. Did you purchase the bov specific to your car ?

Did you purchase it with a charge pipe ?

Bov have different lb. springs of you got universal one make sure you have the correct spring for your car. I'm not sure what bmw vacume pressure is. My supra used a 10lb.

Yep, the bov came with teh charge pipe. It is the Active Autowerke BOV made for the n54.

Do I need to fiddle with the screw on the top of the horn?

MilehighM3 · 05-28-2012, 10:59 AM

It would take a while for the adaptations to get out of spec enough to cause a light. Might have to give them a buzz tomorrow of you can't find it. The caps didn't blow off the factory DV locations did they?
Don't adjust the screw on top!

zaheer · 05-28-2012, 11:12 AM

Quote:

Originally Posted by Bmw135er

It would take a while for the adaptations to get out of spec enough to cause a light. Might have to give them a buzz tomorrow of you can't find it. The caps didn't blow off the factory DV locations did they?
Don't adjust the screw on top!

Il check the caps, I dont think they have flown off as I secured them tight.

Isit still safe for me to drive the car, knowing the blow off is not working?

Sered · 05-28-2012, 12:38 PM

Quote:

Originally Posted by NY135ivishnu

No. Did you purchase the bov specific to your car ?

Did you purchase it with a charge pipe ?

Bov have different lb. springs of you got universal one make sure you have the correct spring for your car. I'm not sure what bmw vacume pressure is. My supra used a 10lb.

Vacuum pressure between vehicles doesn't deviate a whole lot. You can drop in a universal BOV on nearly any vehicle and it will work without adjustment so long as the spring isn't very tight (most aren't). Most of the adjustment has to do with vacuum/pressure transitions.

gzim335 · 05-28-2012, 04:13 PM

mine doesn't blow much on stock boost,try a high gear on low rpm n let the boost build n see if it blow at all.get a tune if u want it to blow the rite way

ASPEC135i · 11-14-2013, 09:05 PM

I have AA BOV and chargepipe combo as well. I have read somewhere that for the top bolt, there should be 6 rings to be seen to be correct. Mine works fine and it also has 6 rings visible. Just FYI.

Jeff@TopGearSolutions · 11-14-2013, 09:31 PM

I never put a BOV on a stock car but it might not be enough boost to make that much noise.

At any rate a hissing noise doesn't necessarily sound right. Maybe get a video.

05-28-2012, 04:51 AM	#1
zaheer Captain 83 Rep 861 Posts Drives: E93 335i Join Date: Nov 2009 Location: London, UK iTrader: (1)	Advice needed: AA Bov not blowing Hey guys, Over the weekend, I installed my AA bov to my stock 335. Once everything was installed, tried it for the first time, no blow off happened. I could see the valve inside moving when revved but no blow off. So I took it for a drive when warmed up, no blowing off on any gear changes at all, no error mesages on the dash, car driving exactly as before installed. Tried revving to 6k before changing gears and heard a little blow off however hardly noticeable. What could be the issue here? the vacuum line is going to the T from the factory line, where one side is capped off (as I did not want to break the nipple on the intake manifold when installing). Do you think I have a leak somewhere? At idle, the bov doesnt seem to be puffing air, and I can hear a very slight hissing noise from somewhere. this also normal? I can upload a video if that helps identifying the problem. __________________
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05-28-2012, 08:22 AM	#2
Themythx Private First Class 6 Rep 194 Posts Drives: 2008 335i Join Date: Mar 2012 Location: SC iTrader: (0)	My guess is if you hear a hissing you might have a leak somewhere..... __________________
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05-28-2012, 08:54 AM	#3
MilehighM3 Brigadier General 915 Rep 3,456 Posts Drives: Harrop E90 M3 Join Date: May 2011 Location: Colorado Springs iTrader: (14) Garage List 2009 E90 M3 [6.50]	There are 2 nipples on the AA bov typically. Do you have the vacuum line hooked to the top or the bottom? Should be on the top fitting.
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05-28-2012, 10:59 AM	#7
MilehighM3 Brigadier General 915 Rep 3,456 Posts Drives: Harrop E90 M3 Join Date: May 2011 Location: Colorado Springs iTrader: (14) Garage List 2009 E90 M3 [6.50]	It would take a while for the adaptations to get out of spec enough to cause a light. Might have to give them a buzz tomorrow of you can't find it. The caps didn't blow off the factory DV locations did they? Don't adjust the screw on top!
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05-28-2012, 04:13 PM	#10
gzim335 Captain 148 Rep 965 Posts Drives: e92 m3 Join Date: Feb 2011 Location: staten island ny iTrader: (4) Garage List 2007/1 e90 335i [2.00]	mine doesn't blow much on stock boost,try a high gear on low rpm n let the boost build n see if it blow at all.get a tune if u want it to blow the rite way __________________ e92 m3 dct gintani stage 2+ full ethanol custom pulley and meth kw clubsport,ap racing radical,volk te37sl,akrapovic rear,recaro profi xl,voltphreaks battery
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11-14-2013, 09:05 PM	#11
ASPEC135i Lieutenant 16 Rep 566 Posts Drives: sideways always Join Date: Oct 2012 Location: location, location iTrader: (0)	I have AA BOV and chargepipe combo as well. I have read somewhere that for the top bolt, there should be 6 rings to be seen to be correct. Mine works fine and it also has 6 rings visible. Just FYI.
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11-14-2013, 09:31 PM	#12
Jeff@TopGearSolutions 3441 Rep 79,211 Posts Drives: C6 Z06, 09 335i, 10 335xi Join Date: Dec 2008 Location: www.TopGearSolutions.com iTrader: (37)	I never put a BOV on a stock car but it might not be enough boost to make that much noise. At any rate a hissing noise doesn't necessarily sound right. Maybe get a video.
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