Smoke Out Exhaust

[00\/\/S6]

Ive been getting a decent amount of smoke out my exhaust under hard accereration when shifting between first and second gear....smoke almost seems to be a brown color. It just happens between shifts that I can see. Any ideas?

[ss~zoso~ss]

if its brown it must be rust or something, no fluid would produce brown smoke

[ss~zoso~ss]

when you shift do you let off the gas or speed shift, it could be running rich but that would be deff. black smoke

[00\/\/S6]

I let off the gas.....normal, but hard shifting

[00\/\/S6]

Is black from running rich?

[sunsetorangess]

Yepp black somke is from running rich... Any mods done?
White smoke is burning coolant/oil etc.
Brown= new one too me
J

[00\/\/S6]

problem solved..............after gm put the new cat on, it stopped

[Redphoenix1998]

clogged cat, that's what it sounded like