Blue smoke!

**boris** · Monday 21st February 2011, 07:58

Morning all
Long story short i have poor fuel consumption, iv tried to identify issue myself and through 3 other garages but after many pennies and lots of pissing around it came to no end.
So a friend of mine tailing me yesterday noticed i had bucket loads of blue smoke so i thought perhaps this is related as i believe blue smoke is related to fuel though please correct me if im wrong..

So i guess my question is what would be the cause of the blue smoke ?
i have a feeling it could it be an O2 sensor ?
thought im not ruling out a ring or even faulty injectors

the car of question is a 2001 (phase 1) S40 1.9 TD about 100k miles

Any input would be greatly appreciated, thank you

**Alan M** · Monday 21st February 2011, 13:50

Black smoke usually shows excessive fuel. Blue smoke is an oil related problem and white grey is usually water.

**boris** · Monday 21st February 2011, 17:35

hmm im assuming that would indicate I would be burning more oil than usual, which I have kept an eye on and there is nothing irregular/don't use much. it could be the friend following me was colour blind! lets say it was black smoke...