Isn't fuel pressure supposed to be up around 5 bar - at least to the accumulator? On the K-jetronic, the fuel injectors are supposed to close completely at 3.3 bar (depending on which bosch book you read).

Correct me if I'm wrong (which I very well may be), but duty cycle on the K-jetronic system is measure in time off, not time on (of your injectors), which means your system is only not delivering fuel 6-7% of the time, which would make sense if your fuel pressure is overly low (and cause a very rich reading) or you have "extra" fuel making it's way into your system. Too low of a duty cycle, and the injectors don't have time to seat; they basically are in an on or partial-on state all of the time.

You could also check your cold start valve - it could be leaking or the time switch may have it constantly operating; that would definately cause an overly rich condition, however I think your duty cycle would be higher.

Oh, and vacuum advance not working will affect smog tests and driveability.

If you go to pdfdatabase.com, you can find plenty of bosch e-books on all of the different injection systems.

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A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608

Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.