injector noise

[Ruan]

There is a certain noise that happens with these injectors and after listening to a few of them, I'm now wondering if infact isn't the injector itself, it's actually the preinjection duration being too long - that's what causes that "marbling" noise or "tacking" noise which I *think* is an overly large pre-injection, I can only assume this is due to either weak solenoids not able to pull the valve back fast enough, causing an oversized pre-injection.

This would explain why it immediately shuts up at ~3000rpm since it suddenly turns off.