can anybody tell me what this is.....i think its the cat but im not sure the car rus fine but when i get on the gas all u see is white smoke and there is a clinking noise inside the exhaust after the glasspack....not alot but a lil cloud with it still coming out the pipe...all i have is the gm stage 2...with the zzp 2.9 pulley....i need help

 

white clouds = coolant leaking into a piston chamber. maybe intake or head gasket.

 

P0420 is Cataylst Low Efficieny. Just looked it up in HPT. Time for a replacement.

Usually that's the last thing that happens. o2 sensor doesn't know what to tell the car when it's not able to convert the gas vapor and in the end it just plumbs it out like a smoke stack.

 

so the cat blew then.....is the stock one able to handle my mod s..i let my friend drive who is stock and he was in...lol...then al of a sudden white smoke.....where can u get a replacement??????

 

99% of the time GM just replaces them. I had like 6 before I finally straight piped. I'm going to tell you though that the GM Stage tune is stupid rich for fuel and it will continue to plug until you do something about it whether you tune it better for leaner conditions or you replace with a highflow. Even a high flow won't really fix it.

Suggestion: Straight pipe the bitch and call it a day. I will also suggest gapping your plugs to .35 or .32 if you can. If you have a .40 gap right now, get rid of it. It's not helping you. I would also replace your plugs if you haven't done it yet. The stock NGK's GM give you are utter crap.

 

the car still runs normally....its jus that code and the small clouds of white smoke

you think that they would do it i jus past my 36000 mile mark.....im sitting at 36638

 

Just a hint, GM warranties the Cataylst Converter 8 years, 80,000 miles. They might charge for install but usually they will cover it. Do you have an extended warranty?

They covered mine and I'm in 60,000 mile land right now.

 

nope no extended warranty....is there any hard copy of this infomation cuz my dealer is known to give problems with the warrenties....lol

 

http://gmcanada.com/gm/english/servi...ranty/gm-total

I know it says Canada but same conditions apply for US as well. Just trying to find the US version.

 

oooohhhh thanks that would be most appreciated....and thanks for all the info man

 

I cannot find what your looking for besides the GM Canada website. I know my dealership covers the Cataylst Converter per GM for 8 yr/80,000 Miles. If you need proof of this you can contact my dealership @ 586-939-7300. Ask for Jason Craiger in service. He can get this in writing for you. Tell him Mr. Cobalt sent you.

 

thans for the refference.....this way if the dealer gives me any b.s i atleast have some proof you now....how much was your extended warr.????

 

I paid 2,000 for it when I bought it with the car. It's good to 75,000 miles. I am rethinking if I want to renew it or not. Not really had any issues with the car after 45,000 miles.

 

Make sure your roaches are put out all the way in the ashtray