The real cause of injector rattle?

[JTaylor2005]

Also confirming that having got a new thermostat fitted the car actually runs cooler than the opening point quite often (80c) stat opens at 83c so wondering if that would be possibly why people reckon the glow plugs in the coolant pulse on and off whilst cruising.

Also that my injector rattle has significantly decreased having fitted a thermostat that is working and not stuck open or leaking around the loose seal like the previous one must have been. (possible to look into when people say their injectors are really rattly might be a cheap way to quieten them down a bit)

Also I have learned a lot so thanks all haha