Quote:
Originally Posted by MerkeyTerkey
Stop adding stuff to my list, geeze guys.
Change fluids
Replace all vacuum hoses
Replace all fuel line hoses
Check the flex disk from tranny to the drive shaft (looking for leaks/tears?)
Grease front/rear suspension.
Fresh gas ✓
It also sounds like it has an exhaust leak, but the muffler/tail pipe/exhaust piping under the car looks fine. And what looks to be the coolant reservoir has a hole in the cap, and now that I think about it I think there's supposed to be a hose going up there...
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I was thinking same thing! But do check fuel line hoses that connect to injectors. They do leak and can cause fires. And flex disk failure can make a big mess. The engine injection system uses vacuum for control, so if it doesn't run well, finding the leaks will become important. A bad Auxilliary Air Valve (AAV) will sometimes make you think you have a vacuum leak - something we have all found out!
By the way, what you have is a D-Jetronic (Early Bosch electronic fuel in jection, D-Jet for short)). If you search here and on Benzworld (mainly in SL forum), you will find a ton of stuff on D-Jets. same system was used on all MB V-8s of that era as well as on Porsche, VW, Jaguar and a number of other Euro cars.
Re the knob on the ECU - You can't do any harm adjusting that. It only affects the IDLE mixture (foot off pedal). Try setting the knob at middle of it's range (11clicks from either extreme) then adjust slowly a click at a time each way until it idles better (do it with car warm).
You might also adjust the idle speed so it is at about 700rpm with engine well warmed up. You can find the idle screw
in the first post here a few pics down. (BTW, that link has most of what you will need to get car running smooth!)