Smoke!!!!! Valve seals or Pistons Rings???, Help!! Options

[elastikman]

Hello!

My 7afe just smoke a little when u first start it up from being cold, and doesn´t smoke under accell, but when you let the engine brake the car and then give it gas is when it will puff out grayish smoke that smells like oil!! And the longer i let it decell the bigger the cloud of smoke when i accell.....


Does this symptoms is valve stem seals?
or can be Pistons rings?

thanks

This post has been edited by elastikman: Nov 26, 2010 - 3:36 AM

[Hanyo]

If your getting smoke under deceleration its the piston rings.

If your getting smoke under acceleration its the valve seals.

The reason: When your accelerating the vacuum in the intake manifold will be under a stronger vacuum drawing in oil through the valve seals. On the other hand, when your decelerating your car is engine braking and a vacuum in created in the pistons sucking oil up past the rings.

How do you test this out? You actually have to have a friend follow you while you drive. Down shift and let the engine brake, if he sees smoke then you know its the piston rings.

Another way is to do a compression test and pour oil into the piston and see if the compression increases with oil added.