D-Jet pretty much vanished after 1972 in the US since it's difficult
to meet CO and unburned hydrocarbon limits using only manifold
pressure as an air metering system without an O2 sensor. Everyone
switched to K-Jet, and then later to LH-Jet when reliable electronic
airflow meters became available.
I would guess the 928 had K-Jet after 1972. Don't know for sure,
though.
Peter
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