All Things Mk5 > How to Guides / Troubleshooting

Intake air leak P2279!

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GVK:
I have read about MAF scaling issues with some aftermarket intakes , even the expensive Revo one isn't perfect according to Pudding on here.

I still run the stock airbox on mine at st1 (310hp/404nm) Mine shows around 243ish g/s which is roughly 303hp so not too far out from the dyno results when it was tuned.

Northern_ED30:
Just did a pull in 3rd all the way to red line and i saw 180-190g/s so I think the leak has gone. That puts me at approximately stock figures.

I know leaks don't fix them selves, but I think this one did :signLOL: I'll monitor it over the next few days and I'll swap the PCV when that comes because it's good to start fresh.

What's the best way to clean a MAF sensor? I can use compressed air at work but don't want to break the thing.

GVK:
I can't spell the name but it's like isoprol contact cleaner used to sell it in places like the now defunct Maplins.

I'd get a gasket for the pcv too.

edit - Isopropyl - this stuff https://www.eurocarparts.com/p/holts-electrical-contact-cleaner-500ml-552996200?type=shopping&gclid=CjwKCAjwlovtBRBrEiwAG3XJ-3bboUCl_cipXMFfeXmXhpnvWy3eu7BiKouf63Lz_nnqBvgmYbl2shoCD_UQAvD_BwE

Northern_ED30:
Any idea where there's a map or diagram for all the vacuum lines on the engine? I've got the leak again. The new PCV i've bought can be blown through just the same as the one on the car so I don't think I'm going to change it.

GVK:
Sorry I don't have ETKA or whatever VW use for parts diagrams these days.

On the TR Hamza vid where he went to R tech, they showed one of the r tech guys blowing through a PCV and telling him that it had a one-way check valve in it and shouldn't be able to be blown through. I can't check mine as it has had a BSH PCV delete fitted.

Are you sure it's not the PCV gasket or brake booster pipes leaking?

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