Just had some quick questions as I am not too familiar with the way these engines work. I have a 03 Legacy and just had the head gaskets replaced by subaru, they said after they replaced it they road tested the car and it was fine. I came to pickup the car, start it up and the first thing is the car starts shaking violently and the check engine light came on.
They pulled it back in and pulled the code and said cylinder 1 was misfiring, they said the compression/leak down test came back fine, they call me back today saying the car is all fixed and that the cam gear broke and bent an intake valve which they replaced.
Now I am wondering for when I go back tomorrow what questions I should ask, and if you guys have any comments on what might have caused this to happen and if I should worry about piston or any other damage that might have happened?