| I think it could be the idle purge valve (fuel vapopur recovery system) clicking open + closed.
Early W203 cars had a service bulletin about just this sort of a noise. The fix was to put a soft rubber gasket under the valve.
__________________
2008 Mercedes-Benz B 200 
2005 smart fortwo cdi pulse cabriolet, loaded 
1966 Peugeot 404 Coupé Injection
1989 Peugeot 405 DL, 366,000 km
|