Wow, it sounds like you are pretty on top of your rubber which is a good thing. It also sounds like you know all the suspect hoses and have replaced them....

A vacuum leak really should make your motor run rough. I'm beginning to think that you have taken good care of your rubber and that this isn't the issue. What is the issue then....... Looking at your previous posts, it appears that your lambda adjustment is correct. If you're not seeing soot build up inside the tailpipe, it's hard to imagine it running too rich at all.....

This is truly puzzling me. If lambda is correct, then in theory, you should be running at optimum mixture. Yet your mileage would indicate otherwise. I am wondering if perhaps idle mixture is perfect but your driving mixture is off. This is quickly departing my libretto of CIS knowledge.




Hmmmmm.........

__________________
-tp


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition