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Discussion Starter · #1 ·
Hey guys, I just picked up a 2008 335xi.

Recently I have noticed a subtle police siren sounding wine coming from the engine which can be faintly heard between about 2000-4000rpm in first and second gear.

Any ideas what this could be?

Thanks in advance.
 

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cor door sedan
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How about when the air conditioning button is on? I'd you turn air conditioning off, does the sound go away?

(My 2008 535xi does this but it is very faint)
 

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Better with Butter
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Some people say turbo shaft play, but lots of people with a very loud siren sound would end up tearing into the engine bay and find no end-play.
Some people have mentioned accessory fan belt pulleys.
Some people have mentioned power steering pumps.

As far as I know, no one knows for sure...
 

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Discussion Starter · #10 ·
Some people say turbo shaft play, but lots of people with a very loud siren sound would end up tearing into the engine bay and find no end-play.
Some people have mentioned accessory fan belt pulleys.
Some people have mentioned power steering pumps.

As far as I know, no one knows for sure...
So would you recommend taking it in before things get worse? Or do you think its a minor issue? I think I'll have a mechanic take a look when I get my winter tires changed.
 

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Better with Butter
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Also, one guy mentioned alternator clutch....


Generally, the dealerships haven't been able to find anything wrong when the cars were taken in.
 

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GODSPD
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Personally, I think all wine should be subtle. Brazen and bold tastes should be left in the gas station flavored-vodka aisle, IMO.
 

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Better with Butter
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So would you recommend taking it in before things get worse? Or do you think its a minor issue? I think I'll have a mechanic take a look when I get my winter tires changed.
Honestly, I'm not sure.
If you can get a mechanic to look it over on the cheap, I guess that would be the prudent thing to do.
 

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Better with Butter
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Slightly more likely that it was turbo shaft end play. But even then.....
A tuned N54 is simply going to have more turbo noise than un-tuned. I still haven't seen anything out there that says that this noise is the harbinger of doom. A few people have claimed this, but haven't backed it up with anything. FUD.
 

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E60 to E90 to E92
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BMWs produce subtle wine from the engine? Merlot, Zinfandel, Riesling?
 

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Police siren whine is deffo turbo on the way out...
 

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