I've a Saab 9-5 2.3T from 2008, 277400km. The motor was ticking, the noise came clearly from the cylinder head. I had the cylinder head overhauled, valves were replaced, head was cleaned, the crankshaft bearings were replaced but the engine is still making the same ticking sound. There is no power loss, the strange thing is that, when driving, if the motor doesn't need the deliver power (e.g. when I don't accelerate and don't touch the pedal) I don't hear the noise. Does somebody know what could cause the noise. It seams that the noise is coming from the valves.