As the subject says, I have a '99 323i that makes a distinctive whine at
approximately 3,000 rpm (changes with load) sounding like a
whistle/whine coming from around the intake area of the engine.
As this car is new to me, the previous owner said it's normal and the
local dealer also said this is not uncommon.
What is the group's opinion on this audible nuance?
Any tips on reducing or eliminating this distraction would be helpful.
Okay, sorry I was working from <a failed> memory on the "E" number.
However, I am familiar with vacuum leaks and this does not sound like
any I've ever heard before. Rather than try to describe exactly the
noise, if anyone can just confirm what I believe in that the BMW
engineers would never design a car and allow a loud whistle-like noise
at appprox. 3,000 rpm - not noticed at any other rpm range or with
transmission (manual) disengaged.
I've had two independent people say it's "not abnormal" but I would
think they are full of it. Are they?
While I have an E36 (1997) I would assume this noise is NOT normal on your
car either. Does it have an after-market air cleaner on it? If not, then
look for a vacuum leak, or perhaps one of the idler pulleys for the fan
belts is bad. Though by saying you don't hear the noise when reving in
neutral, it appears that engine needs to be under load (torqued over, and
really sucking wind) to produce the noise - really suggests a vacuum leak on
the intake. Would think it would throw a code though and 'possibly' set
your check engine light. Maybe a crack somewhere ahead of the MAF sensor?
This would not throw a code.
Thanks for the suggestions. It's good to have another opinion like mine
that this shouldn't be normal. I have no engine error codes, perhaps,
Stock intake and OEM air filter...very few aftermarket parts on the car.
I'll look for some cracks or maybe do some smoke, soapy water, or garden
hose tests later now that I know my sanity is fine.
I have a 97 M3 that had a periodic whistling/whining noise that drove me crazy.
It was not RPM specific as you state, but it turned out to be the idler pully
that is mounted to the alternator.
Hope that helps
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