Anyone else? '07 sierra, 52k. Dealer installed oil deflector and new valve cover previously, now going to replace pistons and rings.
This is an active fuel management problem. (shuts off 4 cylinders to save fuel)... which incidentally does not save fuel.
Just curious if anyone else has had the problem or had a solution. Replacing pistons at 52k miles without machining the cylinders seems crazy to me...or could it be ok?