Lumpy then high idle...

[chasdrury]

My 1.8T has started in the last few days to have a lumpy idle when it starts up. The rev counter is not flicking around alot, but you can feel it in the car - lumpy through the vibrations.

Then, after about 3 or 4 minutes the idle goes from 800rpm to 1100rpm and stays there - not lumpy but obviously high.

Any ideas what it could be? Turning the car off and straight back on it does the same - and it doesn't matter if it's cold or hot.

Cheers!

 

[QuattroCalum]

Check the PCV valve usually the diaphram bursts and the one way valve is no longer one way, this results in high idle and lumpy running.

This kit would replace all parts https://www.ebay.co.uk/p/Engine-Cra...m=181872168268&_trksid=p2047675.c100011.m1850

The part you need is green and available separately but usually more parts break when taking things apart so this kit is a cheap and easy solution. The "L" shaped hose is guaranteed to break if itisn't broken already.

 

[chasdrury]

Thanks! Easy and obvious how to fit?

 

[QuattroCalum]

Thanks! Easy and obvious how to fit?

Plenty of videos on Youtube etc showing how to. Not difficult just fiddly.

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