996 smokes on start up

[desmodic]

My 02 Carrera 2 smokes briefly on start up from cold. It is particularly bad after it has been driven hard then left overnight. Sometimes it produces a big cloud of oil smoke. Someone told me this happened to theirs - is it normal?

[911wise]

Yes this is normal so long as it only lasts for a few seconds. I think it is the result of oil resting in the cylinders (because they are horizontal) and been burnt off on start up.

[rich 36]

They ALL do that sir

sooner or later and to a greater or lesser degree,
as ^ mentioned the layout of engine and its valve position at rest sometimes, allows a tiny bit of oil into combustion chambers, where its
burnt on the start up
causing a large puff of smoke,
as long as it goes away its nothing to worry about at,

Do you park on a slope at times,
as this has been known to enable oil to drain this way and that

[BliarOut]

Yup, TADTS.

Vertically inclined engines don't suffer the same as the oil can seep past the rings whereas in a horizontal engine it just lays in the lowest point in the bores.

[thong]

They dont smoke,change the oil seprator it will stop this,they can get worse ive seen them and the smoke is so bad it can make them undriverble,when i pull the motor on a trip to do rms i allways recomend a oil seperator change because there not expensive and the work to get to it aint nice.

[rich 36]

Oh well there you go,

I've not learnt anything after all






OI! spanners can I buy a Land rover off you, my work here is done

[BliarOut]

Mine's got a new oil/air seperator....

Err, it doesn't smoke a lot on start up actually, but it still will do it if driven hard and then left

[dilbert]

I guess if you thrash it as hard after you start it, as you did before you stopped it, then you wouldn't notice the smoke so much!!!!

HTH.

[desmodic]

Thanks all. I'm feeling a lot better about it now. I'll check out the oil separator.

[sportsandclassic]

Im with thong on this too...change the oil seperator ! they suffer from these units failing thing they are around £150 for the unit.

[BliarOut]

That's the parts price... ends up about £700 fitted though if it's a tip as access is a pig apparently. Had to have mine changed as she was doing a good impression of the Torry Canyon.

[thong]

BliarOut said:

That's the parts price... ends up about £700 fitted though if it's a tip as access is a pig apparently. Had to have mine changed as she was doing a good impression of the Torry Canyon.

That's because its engine out job,

[pikey]

desmodic said:

My 02 Carrera 2 smokes briefly on start up from cold....

Is your drive on a slope? I used to have this: Park it at an angle (after driven hard and left for about a week), smokey start up. Park on level (after driven hard and left for about a week), normal small smoke.

[MJK 24]

I've no Porsche experience, but I do have experience of Horizontally Opposed or 'Boxer' engines from Alfa Romeo, BMW, Subaru and Volkswagen.

After a thrashing, they all smoked on the next cold start. As stated, oil seeping into the bores. Nowt really that can be done about it.