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General => The garage => Topic started by: Mr.Tom on 17 September 2009, 11:20

Title: Mk3 2.0 GTi strange "chooo" sound from engine bay when accelerating.
Post by: Mr.Tom on 17 September 2009, 11:20

I mentioned it before somewhere, but have better diagnosed it (a little)
Whenever I put the accellerator pedal down while driving, I get a strange sort of soft "chooo" sound from somewhere in the engine bay. Best guess is back against the firewall on the driver side.
It also happens when I turn the engine off.
Almost like saying "tissue" quietly with your teeth together, best way I can think of describing it :)
Can press the pedal repeatedly and it will do it each time with the engine running.
Any ideas?

MK3 GTI 2.0 late '96

Title: Re: Mk3 2.0 GTi strange "chooo" sound from engine bay when accelerating.
Post by: Paul86S2 on 17 September 2009, 11:29

Vacuum leak? Check all the vacuum pipes to make sure they are connected properly and are not split.

Paul

Title: Re: Mk3 2.0 GTi strange "chooo" sound from engine bay when accelerating.
Post by: Len on 17 September 2009, 13:04

Perhaps its a turbo!  :grin:

Could be the vac hose to the brake servo?

Title: Re: Mk3 2.0 GTi strange "chooo" sound from engine bay when accelerating.
Post by: Mr.Tom on 17 September 2009, 15:24

Quote from: Len on 17 September 2009, 13:04

Perhaps its a turbo!  :grin:

Wish it was :D
Will take a look at the hoses.
Cheers.

Title: Re: Mk3 2.0 GTi strange "chooo" sound from engine bay when accelerating.
Post by: A7 UFO on 17 September 2009, 15:44

how many people read this

Quote

Almost like saying "tissue" quietly with your teeth together

and then sat there quietly doing it?

Title: Re: Mk3 2.0 GTi strange "chooo" sound from engine bay when accelerating.
Post by: Mr.Tom on 17 September 2009, 15:56

Think I found it.
It's a pipe that runs from the right hand end of the throttle body, round the back of it, then behind the brake fluid reservoir.
On 1A.6 of the haynes manual, it runs from point 14 of the bottom picture, round the back of point 4. So a bugger to get to :/
It is split at the end behind the brake fluid reservoir.

What should I be ordering?

Title: Re: Mk3 2.0 GTi strange "chooo" sound from engine bay when accelerating.
Post by: Mr.Tom on 17 September 2009, 16:19

Okay. It was the break servo pipe apparently. Got it out and popped it over to the local garage. They are ordering me one now :)

Title: Re: Mk3 2.0 GTi strange "chooo" sound from engine bay when accelerating.
Post by: Mr.Tom on 17 September 2009, 17:47

What does it actually do? There is a little valve at the intake end. The engine cuts out of it is disconnected.
But I don't understand what it is for :)

Title: Re: Mk3 2.0 GTi strange "chooo" sound from engine bay when accelerating.
Post by: Len on 17 September 2009, 20:54

Quote from: Len on 17 September 2009, 13:04

Perhaps its a turbo!  :grin:

Could be the vac hose to the brake servo?

Star for Lenny!  :grin:

Its a vacuum hose! It assists the brake servo!

Title: Re: Mk3 2.0 GTi strange "chooo" sound from engine bay when accelerating.
Post by: mumbles on 17 September 2009, 22:59

Quote from: A7 UFO on 17 September 2009, 15:44

how many people read this

Quote

Almost like saying "tissue" quietly with your teeth together

and then sat there quietly doing it?

 :grin:    :lipsrsealed:

Title: Re: Mk3 2.0 GTi strange "chooo" sound from engine bay when accelerating.
Post by: Mr.Tom on 20 September 2009, 00:45

Quote from: Len on 17 September 2009, 20:54

Quote from: Len on 17 September 2009, 13:04

Perhaps its a turbo!  :grin:

Could be the vac hose to the brake servo?

Star for Lenny!  :grin:

Its a vacuum hose! It assists the brake servo!

So why does the engine stop when I disconnect it?

Title: Re: Mk3 2.0 GTi strange "chooo" sound from engine bay when accelerating.
Post by: Mr.Tom on 21 September 2009, 18:22

Argh! £20 for a bit of pipe :( Ah well, got one now at least. Should sort the problem. Just got to get to it now :D