my car blows white smoke but the head gasket was juss replaced u think its a cracked head? or something else?

 

they probably put the headgasket on backwards,head is warped or didn't torque the head bolts to spec...!!!

 

or u need a valve job....

 

yea for got to say car has like 300k miles on it.. but it runs strong as **** besides the smoke of course lol

 

heh figured out the problem :/..... the CEL came on it was a 02 sensor guy musta reset ecu b4 he sold it

 

Usually the o2 sensor wont cause the car to smoke, the car will smoke and cause the o2 sensor to trip. Basically the sensor is telling you there is a problem.

You can try replacing it though, and that might mask it for a while or until it gets fouled again.

 

All of the above, and try using oil treatment that might help.(cost $2.99)

 

Did the guy you buy if from tell you it was just replaced or did you do it or a shop do it.