All Things Mk5 > How to Guides / Troubleshooting

hissing noise on boost revo stage 2 running 0.5 bar

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Daled0111:
i had the same problem but was the DV but you say yours has been changed
when was it changes also did you do it yourself

Dan_FR:
Looks for oily/greasy residue on the pipework, which will indicate a leak nearby. Remove said pipework and inspect it closely, the rubber pipes especially as they could have a split which will only open up under boost

woolley2021:
Dv was changed last week along with pcv and made no difference atall was done by a garage also I couldn't see any kind of oil over any pipes atall to be fair

GrayMK5GTI:
Cracks in the turbo housing have been known on K03 turbo engines. That really is worst case though - I hope its just a split pipe for you

joms6r:
When we fitted the intercooler on my mk6 the o-ring didnt go back in properly where the hard pipe connects to the silicone pipe on the drivers side, and that gave the same issues as what you've described, might be worth checking?

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