Been around in Kidbenz since yesterday and every 20 mins or so while driving, there is a "ship's fog horn" sound coming from below the car that lasts abt 3 secs.
Sounds like a vacuum leak. But all the vacuum operated stuff is working. Apart from the sound, the hard start problem is still there, needing a prod on the accelerator with the key turn to facilitate starting.
Babybenz 1991 190e 1.8