Author Topic: Weird noise when start, only when it's cold.  (Read 598 times)

Offline c_jiahao

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Weird noise when start, only when it's cold.
« on: 19 September 2018, 22:50 »
Hi everyone. We have got a 05 gti mk5. Recently when we start the car when its cold. It makes this noise and then goes away. When the car is warm, it doesn't do it. Just wondering if anyone can help here and maybe know what it could be. I attached a link of the video of starting the car. Thanks very much.

https://youtu.be/qTwv6j5A9zo

Offline Papanesz

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Re: Weird noise when start, only when it's cold.
« Reply #1 on: 10 October 2018, 21:45 »
I have the same issue with my Mk4 Golf GTi, sounds like a vacuum cleaner when starting from cold. The noise goes away after a few minutes. It’s not the exhaust as I had that replace two monhts ago. Somebody suggested the auxiliary air pump. What/where is that?