This sound occurs, from somewhere on top, on the "drivers side" of the engine. It occurs after the car has warmed up. It sounds like an exhaust leak, lifter noise, or possibly an injector(I hope). It's very loud once the engine is warmed, even with the engine hood closed. I searched this out, with many different ideas, and no explanations. My car is an SVT with 102K miles on the original motor. A close friend of mine says be careful of a cam going flat, is this also possible?