Make a donation

Author Topic: Strange high pitched whistle sound upon warmed up engine.  (Read 158 times)

Offline TLondon

  • Can't Read PM's Yet!
  • *
  • Thank You
  • -Given: 0
  • -Receive: 0
  • Posts: 4
Strange high pitched whistle sound upon warmed up engine.
« on: February 20, 2021, 04:04:42 pm »
Hi - just joined to see if anyone can help me with this strange engine noise->





Hi all, new joiner here to the forum. Can anyone help with this engine issue? Happens after 30 mins of driving without fail, stops if i tap the accelerator and when it starts the idling revs become very erratic.

I’ve just spent £200 at a local garage trying to fix it, but it remains. They replaced some pipes that had erroded but its not fixed it. Back into there after the weekend.

Does anyone recognise it?


Offline Clarkj93

  • Taking part
  • ***
  • Thank You
  • -Given: 0
  • -Receive: 2
  • Posts: 42
Re: Strange high pitched whistle sound upon warmed up engine.
« Reply #1 on: February 20, 2021, 04:15:36 pm »
Sounds almost like some belts about to die.... but weird it only happens when warmed up? A fan belt is under a 10er so could try replacing just to see if it makes any difference, probably what id try first but I'm not totally sure sorry pal. Someone more technical will have a pop soon im sure  :happy2:

Offline TLondon

  • Can't Read PM's Yet!
  • *
  • Thank You
  • -Given: 0
  • -Receive: 0
  • Posts: 4
Re: Strange high pitched whistle sound upon warmed up engine.
« Reply #2 on: February 20, 2021, 04:53:21 pm »
Thanks for the response - hopefully someone else can chip in also. I have read it might be the diverter valve also.

Offline TLondon

  • Can't Read PM's Yet!
  • *
  • Thank You
  • -Given: 0
  • -Receive: 0
  • Posts: 4
Re: Strange high pitched whistle sound upon warmed up engine.
« Reply #3 on: February 20, 2021, 05:47:24 pm »
Having checked looks like this thread identical ->

https://www.mk5golfgti.co.uk/forum/index.php/topic,51453.msg587574.html#msg587574

Is the PCV the same as the diverter valve?

Offline Clarkj93

  • Taking part
  • ***
  • Thank You
  • -Given: 0
  • -Receive: 2
  • Posts: 42
Re: Strange high pitched whistle sound upon warmed up engine.
« Reply #4 on: February 20, 2021, 05:53:05 pm »
No the pcv valve and diverter valve are very different things. Neither are very expensive however if either are the issue.

Offline TLondon

  • Can't Read PM's Yet!
  • *
  • Thank You
  • -Given: 0
  • -Receive: 0
  • Posts: 4
Re: Strange high pitched whistle sound upon warmed up engine.
« Reply #5 on: February 20, 2021, 06:33:10 pm »



Here is the work I had carried out this week.