I’ve never had cause to investigate injectors on a vw tdi. I’ve removed the rocker cover, but everything is very oily and I can’t see any obvious crud.
Obviously I’ll wipe it off, and check more carefully, but should any blow-by from injectors be very obvious, or would I need to remove injectors to see it? I presume I cannot run engine with the rocker cover off.
Im a bit nervous of how hard it might to prove to remove injectors, and then replace them properly...