All Things Mk5 > How to Guides / Troubleshooting

Revs rising/ dropping at idle

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lukemk5gti:
Why bother with a delete?

Do you need it? Everyone (including me) sees a modification and immediately thinks they need it. If your PCV is fine then why bother, a new hose is only €10 from China - https://www.aliexpress.com/item/For-VW-Jetta-Golf-Eos-Passat-A4-A6-S6-TT-New-Air-Breather-Vent-Hose-Line/32601636338.html?spm=2114.01010208.3.10.PYVGik&ws_ab_test=searchweb201556_0,searchweb201602_4_10057_10056_10065_10068_10055_10054_10069_10059_10058_418_10073_10017_10070_10060_10061_10052_10062_10053_10050_10051,searchweb201603_1&btsid=002a745e-81b6-4720-83b6-441aca16a85b

I would never buy a cheap Chinese rip if it for anything important but how wrong can you go with a piece of corrugated plastic pipe?

Ollieeee:

--- Quote from: lukemk5gti on September 29, 2016, 01:42:28 pm ---
--- Quote from: Ollieeee on September 29, 2016, 01:17:50 pm ---I had the same issue a while back, it turned out to be the corrugated vacuum pipes off the PCV.

--- End quote ---

This thing - http://www.ebay.ie/itm/Breather-Hose-Pipe-Line-Hose-For-Audi-A4-A6-TT-2-0TFSI-VW-Jetta-New-06F103235-/151510344696

--- End quote ---

That's the badger! There's two though so check both, I replaced both just for peace of mind. It was cracked round the back so not immediately obvious.

leebes:

--- Quote from: lukemk5gti on September 29, 2016, 02:38:19 pm ---Why bother with a delete?


--- End quote ---

Good point, well made!

leebes:
So checked over the PCV breather pipes earlier today as suggested, couldn't see any obvious damage or leak holes so put them back on.

Thought while I was under the bonnet I'd have a clean round and make sure everything was tight, induction kit fittings, etc...and the 4 torx bolts on the PCV plate which all turned out to be slightly loose! Nipped them all up as thought there could be an air leak through the gasket.

Result - on run into town and back, no dodgy revving and the engine sounds quieter and smoother, so maybe the PCV plate has been coming loose for a while and finally loose enough yesterday to cause the leak.

Anyway, looking good at the moment...Cheers for all the advice peeps

lukemk5gti:
Glad to see it's sorted!

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