I know this sounds a bit vague, but I'm stumped by a metallic vibrating rattle from my 1996 Megane. It seems to be engine-speed related, occurring mainly at around 2000rpm. It sounds like a heatshield rattling, but all the heatshields I can find are all firmly attached, including the one under the floorpan on top of the exhaust. I can't find anything else loose, although as with most cars it's difficult to see down the back of the engine.
Any bright ideas anyone?
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It might be the cat breaking up.
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Yes, the same thought had struck me - either that or a loose baffle in the silencer, although the exhaust system is new-ish from the cat back (less than a year old). It's not losing any power, and it was MOT'ed about six weeks ago so the emissions (and therefore the cat) must have been OK then.
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