All Things Mk5 > How to Guides / Troubleshooting

Lumpy idle, holding revs & hissing sound

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Jaks101:
Check for damaged pipes to crank case and possibly a bad PCV valve (25£) part

MIJ_JAGGER:

--- Quote from: Jaks101 on December 04, 2016, 10:38:56 pm ---Check for damaged pipes to crank case and possibly a bad PCV valve (25£) part

--- End quote ---

^^this x2

Happened on mine twice, first time round was the pcv, second time quite recently was the pipe on that connects from pcv to under the intake manifold, cheap and easy fix  :happy2:

Saintsteve:
It could be the Diaphram that's split in the PCV valve assembly as it has a Pin hole in the side of it, which will Hiss air out of it and you will hear it especially when you shut the engine off.
HTH

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