New answers tagged timing-belt
There is a chance that your belt had some offset (1 tooth for example) and your exhaust valve was opening earlier/later. Now your belt is ok and sounds different.
If the belt was off a tooth it could give that response. My MR2 idled fine, but would barely get over 25mph after the timing belt jumped a tooth (and it sounded like a lawnmower). Could also be something else disconnected during the process though like Paulster2 mentions.
BMW's plan was for it to never be changed. Looking at some of the forums, I think advice given from this BMW site seems about spot-on: Well-l-l, I hate to say "never" but the point being, one often needs/wants to crack open & rebuild an engine for other reasons (ring/valve wear, main seals, etc.) by a quarter-million miles or so--at which time, check ...
I had a very similar problem on a Volvo a few years ago, in that case it turned out that the belt had stripped a couple of inches of teeth - so peering in the cover it looked intact, but didn't turn with the crank. This will become obvious if you remove the cover completely. You might be lucky though - a quick bit of googling reveals this quote: The ...
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