I drive a 2005 Vauxhall Corsa 1.8 sri, it's belt driven and has 109,000 miles on it.
I'm getting a rattling noise between 2500-3000rpm, it sounds like lots of bits of metal rattling around inside something.
Key things to note:
- It only happens when the ENGINE IS COLD. It also lessens as the engine warms up more and increases as the engine cools.
- Sounds like its coming from the belt are
I'm thinking metal expands when it gets hotter, so a lose bolt could effectively become tight again when hot?
Any ideas of where to start/what to check. I think a key thing here is the noise goes away when engine is hot and it only happens between certain revs. Could be a lose bolt/screw resonating between certain revs?
Thanks guys for any feedback.