MK5 Golf GTI

All Things Mk5 => How to Guides / Troubleshooting => Topic started by: m.c gti on July 29, 2012, 02:56:11 pm

Title: Whistling sound when I let off the throttle ?
Post by: m.c gti on July 29, 2012, 02:56:11 pm
Can anybody help?
My 57 gti mk5 is making a whistling sound when I let off the throttle here's the things I notice

•the engine has to be up to temp
•it is only there when I take my foot off the throttle
•and it gets high pitched when I turn engine off before releasing an air sound then it goes away

The car is stock no mods as far as I'm aware any light on this problem would be much appreciated thanks
Title: Re: Whistling sound when I let off the throttle ?
Post by: RENNTAG on July 29, 2012, 03:57:36 pm
Dont know about the last point but it sounds like the noise you are hearing is just the boost pressure being releaed by the Diverter Valve. This is normal and all part of having a turbo charged car  :happy2:
Title: Re: Whistling sound when I let off the throttle ?
Post by: m.c gti on July 29, 2012, 04:12:17 pm
This is not a sound I have heard on any of my turbo cars it is still there when the turbo is idle when I'm just sat with my engine running.
Title: Re: Whistling sound when I let off the throttle ?
Post by: edd666999 on July 29, 2012, 04:14:55 pm
do you have or can you make a video of the noise? maybe from outside the car?
Title: Re: Whistling sound when I let off the throttle ?
Post by: RENNTAG on July 29, 2012, 04:32:25 pm
So its not just when you lift off the trottle its any time that the engine is not under load?
Title: Re: Whistling sound when I let off the throttle ?
Post by: m.c gti on July 29, 2012, 06:33:30 pm
No just when I'm off the throttle and gets louder when engine is switched off a friend said it could be diverted valve but engine light ain't on how can I get a video on here ?
Title: Re: Whistling sound when I let off the throttle ?
Post by: Moz on July 29, 2012, 07:14:18 pm
Upload it to youtube and link it.

Was it anything like this noise?

Title: Re: Whistling sound when I let off the throttle ?
Post by: m.c gti on August 01, 2012, 03:54:18 pm
Right guys found the little sh*t. When you lift the engine cover off there is like a valve for the air flow like a little rubber diaphragm on the rocker cover anyone know this part name or number
Title: Re: Whistling sound when I let off the throttle ?
Post by: edd666999 on August 04, 2012, 05:35:24 pm
Quote from: m.c gti on August 01, 2012, 03:54:18 pm
Right guys found the little sh*t. When you lift the engine cover off there is like a valve for the air flow like a little rubber diaphragm on the rocker cover anyone know this part name or number

 :signLOL: theres alot under there. Pcv valve?

Picture please!
Title: Re: Whistling sound when I let off the throttle ?
Post by: Snoopy on August 10, 2012, 07:22:07 pm
Have you seen this thread it may help you.
http://www.mk5golfgti.co.uk/forum/index.php/topic,44709.0.html