Since I’ve been given the best tips for years, I try, even if I (unfortunately) don’t have an omi at the moment. my 2.2 deci X-Trail (Bj 2006; 60 000km) got new injection nozzles 5 months ago. (All 4) Reason: Bosch has measured too high injection quantities. Since a few weeks “knock, nail” in cold operation. Now motor disassembled: Piston OK, bushing OK, but: Some valves are, so to speak, slightly bent, have impact marks at the edges (4 out of 16). One particularly strong i m 3. Cylinder. The workshop denies a connection between the replaced injection nozzles and the current damage. (It would be a guarantee for the first repair) But since not ALL valves on one side have the damage, it can only be at the appropriate times. I therefore exclude a mechanical damage, except the tipping levers have got something, but why then only from few valves? The decisive question is: Can wrong injection (Men) Injectors cause the piston to reach the valves at a time when they are not completely closed? I would be more than grateful for tips and hints.