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Is a high pitched whistling sound at idle a vacuum leak or what?

My vt750c recently began to whistle loudly at idle when fully warmed up. Whistle goes away when idle is increaesd by throttle but not when idle speed adjustment screw is turned. No temp. light is showing and the electric fan is not running. Intake and exhaust are stock units.

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Hissing vacuum leak at idle, louder with open throttle ...

? 1:43
https://www.youtube.com/watch?v=tFoybr865n4
Jun 27, 2010 - Uploaded by fenixus
hissing vacuum leak at idle, louder with open throttle ... i know that my camera is poor and microphone suppresses high pitch ...Hi, my kia picanto engine also sound hissing/humming duringidling with open throttle. ... Loud whistling noise 2000 jeep wrangler 4.0l - Duration: 4:01. by Nasrac72 16,158 views.Missing: vt750c

A Whistle or metal sound with firing... - Honda Shadow Forums ...

www.hondashadow.net > ... > Technical Discussion
Jul 11, 2008 - ... under load (accelerating), that there is a small whistle or even 'tap on metal' high pitch sound ... Pics of my 2008 Shadow Aero 750 (VT750C ... loose bolt vibrating
Feb 29, 2012
High pitch whine
Jul 21, 2009
More results from www.hondashadow.net

Posted on Dec 25, 2015

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  • Claude Kayser
    Claude Kayser Dec 25, 2015

    Loud whistling noise at idle - Honda Shadow Forums : Shadow ...
    www.hondashadow.net › ... › Technical Discussion
    Jun 28, 2009 - I have a 1999 750 ACE with 5000 miles that has started to make a loud whistling noise at idle. Sounds like a vacuum leak. Go up 200 rpm and it ...
    Idle Problem Jun 26, 2011
    750 Ace Idle Noise / Whine Jul 27, 2010
    A Whistle or metal sound with firing... Jul 11, 2008
    More results from www.hondashadow.net
    whistling at idle. - Yamaha FZ-09

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1 Answer

Making whistle noise on off on run and stopping.


There are basically two types of whistle noises.

* Whistle when you get more gas (increase RPM, put gas pedal, sometimes just idling but louder when you put more gas)
This usually intake-side leak.
Intake manifold itself, intake manifold gasket (most likely), even airfilter housing, Airflow meter housing (connector), anything where air goes to engine.
usually engine get rough or unstable idle when intake leak occur.
Engine knocking or pinging may feel.

* Whistle when you decrease RPM (engine brake, reduce speed, sometimes just idling but louder when it dropping RPM)
This usually Vacuum-side leak.
There are many vacuum hoses in engine room. even inside of cabin (heater control, etc)
Try to spot where it coming from.
Vacuum also connected to Brake servo, heater control and spark timing.

Put metal or plastic pipe (small PVC pipe will work fine) to one of your ear then isolate source of noise and find where it come from.

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