Ooh, I've got a comment on Youtube about the BX engine video!
"Dude, that's no healthy sound. First thing I would do is check that the timing belt is not slack or off-time. Then check if the pre-ignition is not off by too many degrees. Then check if the clearances on the valve rockers are to specification. If that's all ok, do a compression test on each of the four cylinders to make sure you don't have a leaking gasket. You might also have worn crank shaft rubbers, in that case a complete engine overhaul would be the best way to get this baby running again."
That's quite a list
TBH I've wondered about the cambelt. It was changed in 06/07 but they didn't renew the tensioner and upon taking the timing cover off I found I was able to move the belt back and forth across the camshaft sprocket by hand - not easily! but I could do it. I didn't think I should be able to do that.
Just recently a jangling noise has appeared at roughly 2200 rpm in all gears. Only when driving, it seems, not when I rev it in neutral. It appears to be coming from the OS of the engine. If I hold the engine at that speed in any gear, it's continuous. You can actually hear it in the BX journey video if you listen out for it. It's like a vibrating spring, or the noise a single (all-metal) key makes when you jangle it on a keyring. I was convinced it was the cage on the underneath of the bonnet rattling but I don't think that's the case. Any ideas? Throttle return spring?
Mark.