white smoke?

**bluedude22** · 06-15-2013

I would of searched this but cant find the search bar. I have 05 GT cat was pluged so bolted new one on and good to go right...well for a few trips all was good..keep getting P0420 and desided to change rear O2 cause it was switching just like front one. started to un thread it and got stuck so just left it in and now when sitting idling for very short time and give er a shot of gas i could smoke out the whole parking lot

anyone got any ideas what is going on? Oh ya this car is new to me so dont know any of the history

**dsmuts** · 06-16-2013

Almost all aftermarket cats set a p0420 the white smoke is likely gas from your car running a car diagnostic. If your o2 is partially unscrewed it'll throw it off

**jlgp2007nc** · 06-16-2013

Large cloud of white smoke is blown head gasket. The white smoke is steam from burning the coolant.

Blue please is burning oil.

Black smoke is unburned fuel.

**Scottydoggs** · 06-16-2013

the upper intake could be leaking as well, what happens in the N/a engine is the upper intake can leak into the engine, and cause the white smoke if bad enough, it can also leak coolant into the engine oil, and kill the engine.

so make sure you have only oil in the crank case, pull the dip stick if its all foamy and milk shake looking and over filled, the intake is leaking.

**jlgp2007nc** · 06-16-2013

X2...I forgot about those intake gaskets.

**bluedude22** · 06-16-2013

i checked all the plugs and nothing looks out of the norm.i would think atleast one of them would look all jacked up but all are clean. pluged in the scanner and the short term fuel trim b1-s2 is stuck at 99.2% weather it is ideling or under load

**bluedude22** · 06-16-2013

oh ya i smelled the smoke and smells like something is burnt or burning not sweet like coolant .weired eh.

**jlgp2007nc** · 06-16-2013

Sensor 2 will always be close to 100%. Rear sensors measure catalyst efficiency.

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**dsmuts** · 06-16-2013

Intake gasket is not likely to cause white smoke. 04+ have aluminum uim so no cracking issues

**BillBoost37** · 06-17-2013

Originally Posted by jlgp2007nc

X2...I forgot about those intake gaskets.

Clearly.. because the head gasket is very uncommon on these cars. More likely he's seeing unburned fuel.

Originally Posted by dsmuts

Intake gasket is not likely to cause white smoke. 04+ have aluminum uim so no cracking issues

04 still had plastic lower intakes.

**bluedude22** · 06-17-2013

thats what i think it is. what or where du you think i should start looking. build date is 10-2004

**Scottydoggs** · 06-17-2013

you want to look where the lower intake meets the heads, under the valve cover lip, or side. you looking to see the gasket. if its plastic, it will be black, if upgraded, it would be silver. silver ones are metal.

**bluedude22** · 06-17-2013

well i cought a really good wiff just now and smells like burnt oil. could the lower intake leak oil into the cylinder. looked and its black plastic. dose GM have an updated set that anyone knows of?

**jlgp2007nc** · 06-17-2013

Yup they upgraded to aluminum.

**bluedude22** · 06-17-2013

are these engines just like the grand am 3.4 where u have to pull the push rods out to get the manifold gasket out/in ?

**Scottydoggs** · 06-17-2013

no push rod removal needed to do the lim, take the upper intake off, then the lower off. you'll want to drain the coolant first.

what the metal gaskets look like, these are acdelco i got from rockauto.

lim and upper intake off.

you dont even have to take the valve covers off, but its a good time to change them while its all apart.

**bluedude22** · 06-17-2013

are these engines just like the grand am 3.4 where u have to pull the push rods out to get the manifold gasket out/in ?

**BillBoost37** · 06-18-2013

Originally Posted by bluedude22

are these engines just like the grand am 3.4 where u have to pull the push rods out to get the manifold gasket out/in ?

dude.. dude said no. There's a few how to's if you search. And it's unlikely that oil leaks into the cylinders at the LIM.

**bluedude22** · 06-19-2013

calm down a s s h o l e just asking a Q

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