Bought a mega cheap e53 X5 sport as I've fancied one for years. Working my way through various issues. I've resolved a few of them but I have developed a rattle which I suspect is the timing chain. I only hear it when I come off the throttle and the engine is slowing down. Its absolutely fine on start up which seems to be most peoples issues. Can anyone confirm? Thanks in advance
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Assuming from your title that you have a diesel, it is the V8 petrol engines that show the rattle at idle. That doesn’t mean that it isn’t a chain issue just that it is very unusual on a 3.0 diesel. It was an issue on the 2.0L diesels (N47) engine used on various cars but not the E53 (M57).
Never anthropomorphise computers. They hate that.