The injectors thread into the prechambers, not directly into the head. If it’s running nicely, don’t mess with the injectors.

Doesn’t nail much? It shouldn’t nail at all! Maybe you hear the effects of a lazy glow plug after a cold start. Afterglow is wonderful.

If your consicience allows consider umm... limiting EGR flow to the intake manifold. It can’t hurt the head to limit what the combustion chambers get to clean air and clean fuel. Make sure blow by and oil leaks into the turbo are in check.

Sixto
98 E320s sedan and wagon
02 C320 wagon