The real cause of injector rattle?

[cully]

the temp gauge reads a different sensor than the ecu temp sensor even though its in the same package

the temp gauge could read zero without affecting the engine running, as the ecu calculates off its own sensor, the only way to read this is via diag software, i watch mine via a scan gauge, with that you can see the temp rise to 84 then drop back to 80 as the stat opens