Background: My LGZ V6 has the injection "tick" but it is very load and never goes away. I pulled my stethoscope out of retirement and listened to the engine, noise is from the back of the engine. Didn't feel like pulling the cover and looking further. It is so load I can hear it with the windows up, at low rpm it sounds like a flat cam lobe. I got tried of the local dealer telling me it's a 'feature' and shinning my on. I called Chevrolet CS and filed a complaint. I should get a call from my dealer in the next 24hrs.