The real cause of injector rattle?

[JTaylor2005]

So then. Update on this thread. My car has always often run around 80ish degrees maximum really. Unless I really give it some and then it gets up a little higher to nearly 90.

I have also noticed that at 90c the injector rattle is significantly reduced. To the point of being pretty much un-noticeable. So I have done some more research. I have slid a large piece of cardboard down the rad. It covers the right half of the rad totally leaving the left half to do the job of cooling the car.

Now within about 10 minutes of driving its sat comfortably at just very slightly under the 90 mark on the gauge. Probably roughly 89ish degrees. Caning it to the top of a stupidly steep hill near mine just tips it over the other side of the 90 so around 93ish.

However once at 89+ there is no injector noise at all thats noticeable in the car. Its brilliant haha. It used to do my head in. Now I know that once I have got it warm it will totally go away. So it seems to be related to engine temperature some how still. Either way 90c makes it much quieter and much nicer to drive around without the annoying rattle noise.