Troubleshooting a Boost Leak....

[WhiteGTI]

The plans sound good! Will aim to be there before 11 so to catch yours on the rollers! Got a friend coming with me who is coming from Swindon, so I will make sure that he gets to my house in plenty of time for us to get to JKM by 11! 

[joesgti]

good post RR    some decent info,

[RedRobin]

^^^^

Thanks, Joe. I'll be posting a pic of the actual crack soon. [Er....I'm referring to the crack in the manifold and nothing camel related!]

[RedRobin]

^ The crack can be seen as indicated by the arrow. This would be causing a minor leakage around the circular flap when closed.

[neg]

Just to add another possible cause of a small boost leak is a faulty oil filler cap. Not very often but they have been known to leak especially after a PCV failure.

I swapped mine as it was only approx £8 for a new one to rule out all possibilities and I now look to be getting a small increase on my boost gauge + vagcom logs, only minor but its there.

Something else to add to the list 

[joesgti]

its crazy that such a small thing can make such a difference. although it also proves that JKM do an awesome diagnostics session 

[neg]

A comment made from a turbo specialist I spoke to - he said he would be suprised a crack that small (and sealed on top) would cause much of a leak. 

Robin,

were the turbine blades inside the turbo checked?  just wondering if there could have been some wear on these too which wont have helped.

[RedRobin]

A comment made from a turbo specialist I spoke to - he said he would be suprised a crack that small (and sealed on top) would cause much of a leak. 

....Well, it wasn't "much of a leak" but it was a leak nonetheless.

Robin,
were the turbine blades inside the turbo checked?  just wondering if there could have been some wear on these too which wont have helped.

....Yes they were checked AFAIK and found to be okay.

[RedRobin]

Quite a few folk are reporting having boost leak problems at the moment and asking about it, and also PM-ing me. So I thought that bumping this up might help as most don't seem to know where/how to do a forum Search.