hi I have a Meriva B 1.4 turbo A 14NET 19VH with the similer Problem except mine Makes a Knocking Noise on acceleration through the Gears! even when warm!I ve been told by the Dealer its Not a Camshaft knock! I have a Lifetime warranty still but Not happy with the noise I have had a New Headgasket &half the Engine bits Changed! after a Coolant loss