The real cause of injector rattle?

[JTaylor2005]

There you go then. I am under the impression there is no way that the ECU would know whether they are working correctly or not really as they are an open loop system which is a shame.

And yeah I don't have one of those unfortunately as mine is a very early model it only has a normal pipe with no cooler on it so my car would probably be more reliant on the glow plugs keeping the engine temp nice and warm on low load conditions