Whistling sound when accelerate to 2500rpm

[megaclaw]

Hi,

Intermittently, when I rev up to about 2500rpm, I can hear whistling sound coming from the front left side of the engine.
It doesn't happen all the time.
Just wondering anything wrong...could it be one of the belts being loose? No diff with air-con on or off.
Anyone has the same experience or advise...pls share.

E46
318iA
Make 2002

 

[megaclaw]

Re: Whistling sound when accelerate to 2500rpm

Found the problem liao!
The air intake hose was loose.
Tried like 1 hr to secure it. Till now still not sure whether properly secured.
Too difficult to screw tight with minimal space for fastening.
Anyway, tried driving around rev up to 3500rpm. Whistling sound disappear.
Found the root cause but not sure fully resolve it. Should I be happy or what :thinking:

 

[megaclaw]

Re: Whistling sound when accelerate to 2500rpm

btw...anyone knows when to change air filter? During 25k servicing?