I have done some measurements at pin-3 of X11 connector, as commented in other post, although repeated here for reference:

When idling, I see about 50% duty cycle, fixed there until the car warms up or, if hot, for several seconds. Then it starts fluctuating around 40-45% or so.
If I accelerate , the average duty cycle decreases to about 25% at 2000-3000 rpm, fluctuating +/-5% approx.

What does this mean? Shouldn't both readings be very similar and around 45-50%?
My car doesn't have an idle mixture adjustment, so how can I correct this, if something is not correct?

Please share your experience. Thanks in advance,

Sergio
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1992 MB 190E 2.3 (8 valves)
1995 Renault Clio 1.9D
1993 Citroen Xantia 1.8i (sold)
1980 Renault 12-TS (gave away)