I have been having an issue with my Peugeot 207 (2008 model) 1.6L VTI petrol engine.
The cam cover was replaced by the garage but hasn't fixed the problem. I have lost faith in them. I have managed to record and upload an example of the noise it makes, but I now realise that when you (the reader) listen to this you can't tell the noises apart because there's just too much noise - you might be able to pick something out though:
Anyway, a good revving of the accelerator cleared it to a more normal sound this time. But something is not right.
When it's idling the engine becomes hesitant and it behaves like it's about to stall. The garage thought it was because a break in the cam cover was letting too much air in, which is what the OBD was suggesting (O2 sensor stuck lean, both before and after the Cat).
Also, now first gear is making a louder noise than usual. I'd describe as a bit like what I imagine it sounds like when a cat is being strangled. 2nd gear behaves like first, 3rd like second and so on.
Since the new cam cover has been put on the behaviour has gotten worse, but at least the oil has stopped dripping.
My thoughts are:
Throttle body: Give it a good clean and fit back again.
Full oil change and filter change (overdue anyway).
Maybe the gear box?
Maybe the cat converter?
I'm clutching at straws now.