All Things Mk5 > How to Guides / Troubleshooting

Smoke on idle when warm

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Calum Reid:
I have a 2005 GTI (stage 2+ Ko3)and recently I’ve been getting oil burning smell along with blueish/grey smoke on idle when warm, supposedly these symptoms are related to knackered stem steals, although smoke goes away after getting on throttle it’s getting quite annoying leaving a massive cloud of smoke after sitting for a few minutes, any idea what would be causing this?

Cheers!

pudding:
It could also be knackered turbo bearings seeping oil into the turbine housing.  Not uncommon with remapped engines.  The extra boost massively accelerates thrust bearing wear.

How many miles?

A good test for worn guides is to back off the gas and overrun the car down a long hill and then floor it at the bottom. If the engine kicks out a nightclub smoke screen, it's the guides.

You can fit new guide seals in situ for reasonable money and see if that solves it.

Calum Reid:
Engine is on 70k, would it be turbo if I’m only getting smoke on idle? Suppose it would be dumping oil then burning off when stopped, Still comes on boost great and peaks at about 23psi.

pudding:
Just seen your other post.  I'd say it's the engine rather than turbo.  Same problem as the other chap.  Broken piston(s).  Obviously only a full strip down will confirm for sure but a leak down test is a good indicator.  If an excessive amount of air blasts out of the oil cap, it's escaping past the piston.  A broken piston can cause a lot of oil consumption and smoke, but still show a decent compression reading......but combustion pressures are a lot higher than compression tests.

Calum Reid:
Yeah I’ve been meaning to get a leak test done, reckon it is internals of the engine… expensive!

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