Have some troubles with the idle of my 1985 MB 280se (M110)
Some one told me to replace the idle by-pass I removed the part and there seems to be something loose inside.
The MB part n°=000 049 17 65
He told me it could be the auxiliary air valve too! N° 000 141 15 25
How can the parts be tested, they are very expensive +/- 230$ each!
Thanks for any help