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Date registered: Oct 2002
Vehicle: 1967 250 SL, 1963 220Sb
Location: Los Angeles / Altadena
Mentioned: 3 Post(s)
Quoted: 130 Post(s)
the car starts fine, but it just simply won't hold the idle and keeps on shutting off. With revs up it runs just fine, but at idle it shuts down.
I could be wrong, but I think that the zenith carbs have an electronic shutoff for the idle jet. Basically if the car is off, it closes the idle jet. See if there is a place on the carb(s) where there are wires connected and see if the wires are either hot or not hot based on the ignition being on or off. It is quite possible that those wires are disconnected or not functioning which would cause the problem you are describing.
Currently: 1967 250 SL, 1963 220Sb, 1965 300SE Lang, 1971 280SE parts car, 1972 Alfa GTV, 1965 Alfa Duetto, 1993 BMW R100R
Past: 1971 250 C, 1985 300 TD, 1967 250 S, 1968 280 S,1981 300 D, 1982 280CE, 3 Facel Vegas, Borgward Isabella Coupe, Alfa 2600 Sprint, Volvo P1900 (yes), numerous less interesting Volvos, ...