Howling sound

mr_z4mc1m_oz · 10-16-2014, 05:25 PM

I was driving my z4mc ('07 with 47,000kms) last night and noticed a faint howling sound when the car was moving only. It stopped when I was stationary.

Its very hard to pinpoint where its coming from over the engine sound and s-sprint exhaust.

Any ideas what I should look out for would be greatly appreciated.

Thanks

gas-can · 10-16-2014, 08:19 PM

I would first try to confirm whether it is from the engine or somewhere else.

If you have a manual, push the clutch in when you hear the sound and raise the RPMs. Does the sound change? If it's rpm dependent you can tie it pretty reliably to the engine. You can also do something similar to eliminate the tranny.

If it's the engine, I would check the intake air handlers- a leaky boot/input tube can make a howling sound especially when you accelerate.

-gc

10-16-2014, 05:25 PM	#1
mr_z4mc1m_oz Captain 272 Rep 662 Posts Drives: BMW Z4 M Coupe & 1M Join Date: May 2009 Location: Sydney Australia iTrader: (0)	Howling sound - what is it I was driving my z4mc ('07 with 47,000kms) last night and noticed a faint howling sound when the car was moving only. It stopped when I was stationary. Its very hard to pinpoint where its coming from over the engine sound and s-sprint exhaust. Any ideas what I should look out for would be greatly appreciated. Thanks __________________ Current: Z4MCoupe, Interlagos Blue, Carbon Extended Leather, Sat Nav, Heated Seats, Supersprint Exhaust, BBS CH19's, Stubby Aerial. AND E82 1M, Alpine White Sold: 3 x 130i (White, Red & Black), Mk4 VW Golf R32, '03 Reno Clio Sport
	Appreciate 0 Tweet Quote

10-16-2014, 08:19 PM	#2
gas-can Second Lieutenant 25 Rep 204 Posts Drives: 2006 3.0i Roadster Join Date: Oct 2012 Location: USA iTrader: (0)	I would first try to confirm whether it is from the engine or somewhere else. If you have a manual, push the clutch in when you hear the sound and raise the RPMs. Does the sound change? If it's rpm dependent you can tie it pretty reliably to the engine. You can also do something similar to eliminate the tranny. If it's the engine, I would check the intake air handlers- a leaky boot/input tube can make a howling sound especially when you accelerate. -gc
	Appreciate 0 Quote