st1llet0

iTrader: (2)

89' GTU, 107k miles, nearly all stock.

My main cat is obviously on it's last leg, the heat shield is comming off it and all. I was wondering if this could be related to the smoking that I get at high rpm (= high exhaust temps) or if I'm just trying to be optimistic when my real problem is oil control rings?

st1llet0

iTrader: (2)

Anybody have any input? I'd like to know if this could be causing the problem, just for some peice of mind.

Unsupa

iTrader: (2)

blue-ish smoke?

edit: 700th post, woohoo...

st1llet0

iTrader: (2)

yeah, well, it smells heavily like.... exhaust. It's not sweet smelling or anything. I was just wondering if the buildup in the cat could be smoking from the high exhaust temps produced at higher rpms. I also noticed that after heaving revving/driving after I turn the car off the cat literally smokes for a couple of minutes.

J-Rat

iTrader: (2)

what color is the smoke? blue?

st1llet0

iTrader: (2)

I'm going to apologize in advance if I seem a little annoyed. Yes, I know oil smoke is blue and coolant smoke is white, and a rich fuel mixture is very dark grey or black. However the color is kind of a whitish/blueish/greyish color. I mean, exuast smoke is exhaust smoke. I know it's not coolant, If anything I would say oil, but it smells gassy like I'm running a little rich. But mostly it just smells like exhaust, like you stuck you your nose up a tail pipe. However, regardless of the color, is it possible for a bad cat to produce large amounts of smoke, of any color, at high rpms?

cptpain

iTrader: (1)

just gut your cat till you can get a good replacement of an exhaust, you might diminish flow but youre better off that way if you want to harm your motor in any way

J-Rat

iTrader: (2)

Highly unlikely. Sounds more like your motor is not happy.