what causes brown exhaust smoke?

[Full Spectrum]

I think my old VP had this smoke. Cat was Toasted burnt out with crap flying out of it..

 

[black as]

It would be unburnt fuel, depending on the way the light hits it the colour could be brown.

Sure your not looking at the bushfire haze in the north:rofl:

 

[andyman]

ecotecs are allways been known to chuff a bit fuel smoke under hard acceleration, i noticed the ecotecs that were on our track day chuffed a bit as they hammering down the straight, ls1's with a tune seem to do it to - depending on the tune,


but yes reddy brown can be from dust being blown out the pipes, more

 

[vsl67]

Ive got an old mannual from 1973 that covers American cars and has a section on the exhaust smoke colours and its says
brown smoke = mice cooking in the exhaust system lol

 

[Not_An_Abba_Fan]

Sure your not looking at the bushfire haze in the north:rofl:

The bushfire haze is south actually....it would have been funny if you weren't in Victoria....