exhaust puffing

[kaz16]

was just having my car washed and the engine was running and i noticed how every few seconds the exhaust was "puffin" out smoke like a big O coming out along with the normal exhaust fumes.

my ecu light is on but im told this is probably due to my cup having a sports cat. it also has a stainless steel scorpion. havnt really noticed this before.

do you think its anything to worry about or get checked out?
generally the car runs fine

 

[David Ramsey]

Misfire? Does the engine note change?

 

[Dave..]

Nothing to worry about.

Chances are it'll be steam.

 

[kaz16]

no engine mis fire it was before but that was just spark plugs and since changing th eplugs the mis fire has gone so yeah probably me just worrying because everything runs ok, cheers guys

 

[kevin.s]

probly steam mate. i have it pluming out the back of mine and put a vid up and was told its nothing to worry about. does it go away when the engine warms up ?