Reference to your previous post, the screw under the air cleaner is NOT
the idle speed adjustment. It is the mixture adjustment. This can be
set either with an O2 sensor or with the carb cleaner method from
"Briefly squirt a bit of carb cleaner into the air intake and listen to
1. If the engine seem to stumble a bit, then it is too rich.
2. If the engine seem to revs up a bit, then it is too lean.
3. If the engine show no change, then it is perfect!
It is the sublety you are listening to... so pay close attention of
what your engine is saying to you. Viola!"
Yes, this really works. Clockwise richens it, ccw leans it. If the
engine stalls, you squirted too much. Watch for fire hazards while
working on fuel systems. You really want to get onto e-bay and get a
service manual for this beast. Its also a good place to find tools.
Find a cheap online source of parts (lots of suggestions on this ng).
The idle speed problem is probably the control unit. Welcome to the
wonderful world of MB.
Mike '82 380 Sl 163K, '81 380 SL 125K