Well I pulled into work yesterday (after a 40 mile drive) and the car lost power. Poped the hood and hear what sounded like a really bad lifter.

Got the car home, pulled the plugs and did a compression test. Everything was 170psi except #4 which was 0psi. Pull the valve cover and found that the exhaust spring broken. Why? Stuck hydrolic lifter?

Anyone have a good procedure on how to change the spring?

I'll probably change the spring, the cup, and the hydralic lifter.

Anything else I should change.

Anyone recommend a valve spring compressor that works on the M103 engine?

Thanks.