2004 330. When I do a cold start I've started hearing a groaning noise. It's coming from the area around the brake booster. It's definitely not the SAP. It almost sounds like an HVAC door/flap that is struggling to open or close. I've tried starting the car with the hood open a couple times but so far I can't get it to reproduce the noise with the hood open. It's still intermittent. Any ideas?
Bleed your cooling system http://forums.bimmerforums.com/forum....php?t=1709482The ULTIMATE OEM Alarm/Keyless thread http://forums.bimmerforums.com/forum....php?t=1792200
Try turning the ignition to run but without starting the engine. This supplies power to everything in the car. Does the noise occur?
Lee - check your DISA flap.
https://www.google.com/search?q=disa...ih=757#imgrc=_
Thanks. I actually have a spare disa unit. I'll swap it in and report back.
Bleed your cooling system http://forums.bimmerforums.com/forum....php?t=1709482The ULTIMATE OEM Alarm/Keyless thread http://forums.bimmerforums.com/forum....php?t=1792200
Replacing the DISA had no effect. Still groans and it's doing it while I drive. Seems to happen most when I let off the gas. Performance isn't affected nothing strange going on just that noise.
Bleed your cooling system http://forums.bimmerforums.com/forum....php?t=1709482The ULTIMATE OEM Alarm/Keyless thread http://forums.bimmerforums.com/forum....php?t=1792200
Shot in the dark: Check your belts and pulleys.
Johnny Murray
Somebody commented that an oil separator packing it in had a "Chewbaca-kind of sound". Sounds like my wife's sport wagon, which is drinking oil like nobody's business. Fortunately, I have a cold-weather oil separator sitting on shelf. Unfortunately, it's a bugger of a job to replace it without taking out the intake manifold.
I replaced the oil separator and all those tubes about 2000 miles ago but I did not buy an OEM version. I have definitely considered this as the cause.
Yes it's a bear to access it but I might bite the bullet and swap in a new one.
Bleed your cooling system http://forums.bimmerforums.com/forum....php?t=1709482The ULTIMATE OEM Alarm/Keyless thread http://forums.bimmerforums.com/forum....php?t=1792200
While it's groaning at idle pull the dipstick or loosen the oil cap slightly does the noise change
Both belt driven...an AC unit...and separate Alternator-Power steering-water pump...serpentine belt system...include (idler pulley wheels and belt tensioners......When these mechanical items become worn...they emit similar in your observation.
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