I have a 2006 cobalt ss/sc and I have a corsa performance exhaust on it. When i first start my car up after it sets for a while and its cool, when I first take off, there is a bunch of greyish blackish smoke comes out. Just wondering if this is normal or if there is something wrong like a bad converter or something. Thanks in advance..

 

ext brand new? how many miles on ext?

 

22,000 km on the exhaust

 

heard of that before no pwr loss? oil looks fine? not overflowing the oil any extly 6 qts?

 

Yup just changed the oil yesturday, oil was fine, 6.5 liters as its called for. Its not oil, it doesnt smell like oil, and its not blue smoke, its greyish blackish, the gf noticed it the other day when she was behind me and i noticed it as well.

 

Our cars run pretty rich to begin with. I wouldnt worry about it. My old 2.4 SS did that sometimes.

 

hard launch or accelerating fast? big cloud or just alittle puff? small clouds are normal under wot or close to wot

your not throwing codes i did with my cai before stage 2 it was fuel management sys stage2 fixes that problem

 

I was just taking off, not really wot, it was a big cloud, but only does it when the car is cold, after it warms up, it doesnt seem to do it until you accelerate fast... I just ordered stage 2 so that might fix it.

 

yesh it sounds like your running pretty rich

 

while its at the dealer ask some quest. small clouds are normal sorry i cant be any help maybe it will fix itself i had small clouds still do they are mad to run rich but a big cloud raises some quest. good luck the stage2 kit may fix it because of the injector swap and reflash

 

It probably nothing serious, i guess that these cars run really rich to begin with and it only does it when it cold after you let it warm up for a min or two then take off. I checked when I first start the car in the morning, and its just steam that come out not smoke. If it was burning oil, it would smoke when you first start it up. When it does have that puff of greyish black smoke, it doesn't smell like oil, it smells like sulfur or something like when you have a bad converter, but there is no codes at all...