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Air leak sound


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Had my vRS since August without an issue, although took it to a VW garage to get a few jobs done, mainly cambelt and water pump as it's at 73k.

Day after the service and MOT my vRS makes a noise like compressed air is being released from a gas canister. It only makes the noise when I'm accelerating, around 1800-2900 RMP. There isn't any noticeable loss of power as far as I can tell. My vRS has a shark stage 1 map, 169BHP and 360Nm of torque.

I've noticed lots of oil around the EGR valve but not much else as far as I can see.

 

The garage overfilled the coolant, it's about 2cm above max, but didn't think this would be an issue.

 

Has anyone experienced or heard about anything similar before?

 

I was hoping it wasn't anything to do with the turbo as the garage already charged me a huge amount for what they did, won't be going back there again!  :wall:

Edited by SuperBox670
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Mine also does this. I'm pretty sure it isn't my boost pipes as I've replaced them all near enough and also my intercooler is new so I am confident it isn't split or anything. Could possibly be a vacuum leak?

Just to confitm though, my car is unmapped and my egr is fine.

(Also my turbo is new/reconditioned replaced at same time as intercooler).

sent from my Galaxy Note 3

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When cambelt is replaced upper boost pipes are removed. I would double check all the uppers pipes are sealed correctly and clipped in tightly. As they are easy to not clip in correctly etc. 

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I had a brake servo vacuum hose replaced recently, when my car dumped it's coolant everywhere and the nice RAC man bypasse my heater and filled the system back up I started it with the bonnet open and he pointed out a hissing noise. Wasn't all that loud though...

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I think we have very different views of what a whistle compromises of! Lol surely you were chucking pools of black smoke out and huge loss in performance with that not connected properly?

sent from my Galaxy Note 3

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Haha yes, well it sounds like air from a canister when boosting! Not really a whistle, apologies if this is how I described it >_< 
I wasn't ragging it incase it was something serious like the turbo, there was more smoke than usual when I first booted it, but not with usual driving and I did 50 miles home doing 60 so mpg wasn't noticeably low. Performance was more sluggish but still had power.

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yeah I've blown that pipe off before (somehow doesn't feel right writing that...? Lol). The whistle I have now is more of a kill bill style whistle :-)

sent from my Galaxy Note 3

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Yeah did still have power, as in still very quickly got up to motorway speeds. The pipe that's come loose had evidently been spraying **** all over the surrounding areas of the engine bay but with the speeds of the air passing through I guess the majority went straight on down the pipe and only a small percentage escaped because of the pressure differences.

Cheers for the advice Tech, very useful!

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