Car whistles.....any clue why?

[m3f_Sirius_880bd69485]

Me 2! Except mine is more like a tiny blow off valve! It only happens when Im power shifting....



Maybe you're hearing the crankcase purge valve.

[m3f_2k_889896e9da]

Maybe you're hearing the crankcase purge valve.



I hope thats a good thing??

[m3f_Sirius_880bd69485]

Its the same thing you might hear when you turn the car off.. that quick hiss noise, some people hear it, some done. Its to equalize pressure in the crankcase.

[m3f_Reverend73_9c52635a59]

I figure if it is truly a bearing, then it will only get worse. Still only does it intermittently though. Still think mine may be the alternator

[m3f_Estoril73_908f73b8cc]

I figure if it is truly a bearing, then it will only get worse. Still only does it intermittently though. Still think mine may be the alternator



Have you guys figured this problem out? I explained the whistling problem to the dealer and they also said it might be the pulleys and their bearings goin out. Just thought you guys might want to know. :beer:

[m3f_Sirius_880bd69485]

Theres a few common whistles/squeeks on the front of our cars.



Most common:



Whine: Alternator underload.

Squeeking that 'pulsates': Probably a belt tensioner.

Squeeking/grinding noise that changes with engine speed: Probably a pulley on its way out.



If you can get the belts off, spin the idler pullies. If they feel tight and rotate around for only a few seconds or less, they are fine. Worn pullies will feel very loose and spin freely for awhile.

[m3f_Drifter_23d8df4bc6]

It could also be your idler pully mine went out some time ago and it sounded like whistling/streeching sound.



Oh you could have a s/c under the hood and just not know it.

[m3f_PurpleM3Pursuit]

Me 2! Except mine is more like a tiny blow off valve! It only happens when Im power shifting....

do u have an aftermarket intake? when i get on mine directly after shifting and go at it the intake whistles nice and loud.. lol.. almost like a bov.. but at the wrong time i guess