fuel questions

[Phil@sievers.com (Phil Payne)]

In message <199704091621.JAA06685@netcom21.netcom.com> orin@netcom.com (Orin Eman) writes:

> On the MC, the frequency (lambda) valve is used for more than just fine
> tuning the mixture - as soon as you get on boost or at WOT, the system
> goes open loop and ignores the O2 sensor, providing fuel enrichment.
> It actually runs at a fixed frequency, it is the duty cycle that matters.
> A greater duty cycle enrichens the mixture and I set mine around 40%
> at idle.
>
> It sounds to me like your (Phil's) car is using a K-Lambda system that
> runs open loop all the time - no O2 sensor, hence I'll bet a 50%
> duty cycle at idle.

I think we're (I'm) getting somewhere.  I managed to find a (less old)
control pressure regulator and freqency valve out of another MB today,
and put it in the car.

Excuse me - WWHHHHHEEEEEEE!!!

Sorry.  But it fixed the bulk of the problem.  Now I would like to
establish a definitive metric for my "old" and "new" valves - so that I
can recognise the condition again.

How can the duty cycle be adjusted?

--
 Phil Payne
 Phone: +44 385302803  Fax: +44 1536723021  CIS: 100012,1660