White smoke/vapour from exhaust

[TSE Stag]

After Head gasket failure on the M25 last year my engine is now together again and running well, apart from this annoying white smoke/vapour emitted when up to temperature.
There is no overheating no apparent water loss, leaks in the vee or from anywhere and the engine is timed and carbs are balanced.
My question or questions to the panel are. is it possible for water to have gathered within the exhaust system after the HGF and for that water to be expelled in the form of steam once it heats up? I have been told to give the car a good long run but am a little reluctant to do so whilst in this condition.
It would seem to be water vapour mixed with petrol fumes leaving some black sooty deposit around the inside of the pipes.The car seems to be running rich as well so maybe a combination of the two? pretty sure it is not oil based smoke.
Any ideas would be much appreciated.

[tjk]

Hi
IF you are sure you are not losing water then there well maybe water in your exhaust from your HG failure. I would go for a long drive say 20 miles this would burn off any water in system.
tjk

[Ian F]

TSE Stag

Try a long run and making sure it's up to temp for at least an hour, should dry out any condensation in the exhaust, but you mention white smoke? Are you losing any brake fluid? Brake fluid being sucked into the inlet manifold could cause white/grey smoke so it may not be condensation?

ian F

[TSE Stag]

Thanks for the quick replies,definitely no water loss and pretty sure there's no brake fluid missing in action, just checked.
looks like it will be the long run then.

Much appreciated JK