330i Whoop Whoop Whoop noise at low rpm

Prollig · 10-15-2015, 04:27 PM

I have a noise it's hard to search for but it basically sounds like a whoop whoop whoop sort of noise that gets progressively faster when the rpms go up and you can no longer here it after about 2k rpms. It also doesn't make the noise so much below 800 rpms.

Popping the hood it seems to be near the exhaust manifold side of the engine.

I don't see the belt rubbing on anything...

There seems to be oil leaking from the exhaust side of the engine. Plastic housing plugs are dirty with oil on that side.

Is there a pump that spins on the engine's power that is going out or something? It's definitely something powered by the engine.

Meeni · 10-15-2015, 09:05 PM

Does it do it also with the AC off ?

frenchi · 10-16-2015, 04:54 AM

Seems like an alternator pulley bearing problem,try to remove your belt and spin all pulleys by hand .....

Prollig · 10-16-2015, 02:49 PM

Thanks happens with the AC off.

MrN1ceGuy · 10-16-2015, 04:56 PM

Does it happen when you are driving, or is it when the car's stationary?

Efthreeoh · 10-17-2015, 07:37 AM

I'd guess it could be the pulley on the tensioner, or the two other idler pulleys. Just take the belt off (very easy to do - look for the DIY) and free spin each pulley. When the pulleys are new the bearing are tight and they don't spin very fast and have resistance. As the bearings age, they loosen up a bit. If they are "grainy" when they spin, the bearings are pretty much spent.

Meeni · 10-17-2015, 01:29 PM

Yeah, if any of the pulley free rolls and make a "trrrrrrrrrrrrrrrrr" sound, it's dead, basically.

GoRomeo · 10-17-2015, 07:19 PM

Video upload please...

PichaDis11 · 10-23-2015, 06:31 PM

Quote:

Originally Posted by GoRomeo

Video upload please...

+1

10-15-2015, 04:27 PM	#1
Prollig Second Lieutenant 120 Rep 229 Posts Drives: 2017 M2 Join Date: Aug 2010 Location: Long Beach, CA iTrader: (1)	330i Whoop Whoop Whoop noise at low rpm I have a noise it's hard to search for but it basically sounds like a whoop whoop whoop sort of noise that gets progressively faster when the rpms go up and you can no longer here it after about 2k rpms. It also doesn't make the noise so much below 800 rpms. Popping the hood it seems to be near the exhaust manifold side of the engine. I don't see the belt rubbing on anything... There seems to be oil leaking from the exhaust side of the engine. Plastic housing plugs are dirty with oil on that side. Is there a pump that spins on the engine's power that is going out or something? It's definitely something powered by the engine.
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10-15-2015, 09:05 PM	#2
Meeni Gateropode 333 Rep 2,842 Posts Drives: BMW 330i 06 Join Date: Apr 2012 Location: TN iTrader: (0)	Does it do it also with the AC off ?
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10-16-2015, 04:54 AM	#3
frenchi Lieutenant 93 Rep 452 Posts Drives: F30 340i M Performance Join Date: Nov 2008 Location: France iTrader: (11)	Seems like an alternator pulley bearing problem,try to remove your belt and spin all pulleys by hand .....
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10-16-2015, 02:49 PM	#4
Prollig Second Lieutenant 120 Rep 229 Posts Drives: 2017 M2 Join Date: Aug 2010 Location: Long Beach, CA iTrader: (1)	Thanks happens with the AC off.
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10-16-2015, 04:56 PM	#5
MrN1ceGuy Private 7 Rep 77 Posts Drives: SGM E90 330i 6MT ZSP ZPP Join Date: Nov 2014 Location: Facebook HQ iTrader: (0)	Does it happen when you are driving, or is it when the car's stationary? __________________ E90 330i 6MT ZSP BMW Performance Exhast///M-Tech Steering Wheel, Shift Knob and Pedal Set///M3 Suspension Arms///Tein S-Tech///Bilstein Sports
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10-17-2015, 07:37 AM	#6
Efthreeoh General 19948 Rep 19,265 Posts Drives: The E90 + Z4 Coupe & Z3 R'ster Join Date: May 2012 Location: Verginny iTrader: (0)	I'd guess it could be the pulley on the tensioner, or the two other idler pulleys. Just take the belt off (very easy to do - look for the DIY) and free spin each pulley. When the pulleys are new the bearing are tight and they don't spin very fast and have resistance. As the bearings age, they loosen up a bit. If they are "grainy" when they spin, the bearings are pretty much spent. __________________ A manual transmission can be set to "comfort", "sport", and "track" modes simply by the technique and speed at which you shift it; it doesn't need "modes", modes are for manumatics that try to behave like a real 3-pedal manual transmission. If you can money-shift it, it's a manual transmission. "Yeah, but NO ONE puts an automatic trans shift knob on a manual transmission."
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10-17-2015, 01:29 PM	#7
Meeni Gateropode 333 Rep 2,842 Posts Drives: BMW 330i 06 Join Date: Apr 2012 Location: TN iTrader: (0)	Yeah, if any of the pulley free rolls and make a "trrrrrrrrrrrrrrrrr" sound, it's dead, basically.
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10-17-2015, 07:19 PM	#8
GoRomeo Brigadier General 1330 Rep 4,231 Posts Drives: 330i, 135i Join Date: Feb 2006 Location: San Diego CA iTrader: (0) Garage List 2008 BMW 135i [6.33] 2006 330i [6.75]	Video upload please...
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