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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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Old 05-15-2014, 08:05 AM
geomax geomax is offline
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Question BPV problem?

A question for the forum: I'm hearing this odd noise when I accelerate slowly. It's a groaning hydraulic kind of noise that lasts a second or two - but is always followed by the sound of the BPV valve. Usually happens when I shift from 1st into second, or second to third, and gently accelerate. I've seen many threads that say that people can hardly hear the turbo's in N54/N55 engine during normal driving..but I hear all kinds of hisses, whistles, etc (especially when it's cold out. As it gets warmer, the turbo sounds get quieter). Sometimes when I hear the odd groaning noise, it almost feels like something is slightly stuck because I occasionally get a slight hitch in power, and when the noise stops, everything seems normal.

I've brought it to the dealer several times now to investigate this, as well as an independent mechanic, and they all say they can find nothing wrong. There's no warning lights, or codes. But to me, this sound just doesn't seem to be "normal". Could it be a faulty BPV valve?

Because the noise sounded sort of hydraulic, I've had the brake/clutch lines bled, and fluids replaced, etc. But that didn't solve it. I did get a new gearbox and slave cylinder recently, so it might be related to that.

How does a BPV operate? Is it mechanical, or driven by pressure only? Is there any part of the turbo that could make a noise like this?

I suppose since the dealer and a local shop told me there's "nothing wrong", I should just try to ignore it - but part of me thinks this could be an indication of something that could become a bigger problem later...

Any thoughts or suggestions would be appreciated.
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  #2  
Old 05-15-2014, 08:12 PM
sptt144 sptt144 is offline
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Any issues with power performance before and after the gearbox change? I only hear my turbos when I really hammer it and radio is off and it sounds like a whistling which is probably the blow off valves.

Last edited by sptt144; 05-15-2014 at 08:13 PM.
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Old 05-15-2014, 09:13 PM
CALWATERBOY's Avatar
CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by geomax View Post
Because the noise sounded sort of hydraulic, I've had the brake/clutch lines bled, and fluids replaced, etc. But that didn't solve it. I did get a new gearbox and slave cylinder recently, so it might be related to that.

Whoa - new tranny?

What prompted that?
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Old 05-16-2014, 03:39 AM
geomax geomax is offline
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Quote:
Originally Posted by sptt144 View Post
Any issues with power performance before and after the gearbox change? I only hear my turbos when I really hammer it and radio is off and it sounds like a whistling which is probably the blow off valves.
Sometimes I wonder whether I'm getting full boost. But the dealer told me if the turbo wasn't making enough boost, that i'd see warning lights (which I don't).

In my car, I hear the turbo constantly. The noise I often hear is a hissing sound (which I don't think is normal as well). I asked the dealer and mechanic to check this out as well, and again was told that this is normal.

I have noticed that the warmer the outside temperature, the less noise it seems to make. In any event, I'm wondering if the BPV is bad. Any suggestions on replacement?
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Old 05-16-2014, 03:42 AM
geomax geomax is offline
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Quote:
Originally Posted by CALWATERBOY View Post
Whoa - new tranny?

What prompted that?
Bad bearings inside the tranny (I have a MT). I was hearing a noise that sounded like ball bearings rolling/scraping around inside a can. So they replaced the entire thing, along with a slave cylinder.
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Old 05-16-2014, 02:54 PM
geomax geomax is offline
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Is there an aftermarket BPV for the N55 engine? Anyone?
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