Lifetime Premium Member
Date registered: Oct 2002
Vehicle: 1967 250 SL, 1963 220Sb
Location: Los Angeles / Altadena
Mentioned: 3 Post(s)
Quoted: 102 Post(s)
To say what the previous poster said in a slightly different way... On my 1967 250S which _probably_ has the same transmission, there is an electronic switch on the front carb. The purpose of the switch is to tell the transmission that the accelerator is OFF. The reason the transmission wants to know that your foot is off the gas is so it will shift really softly (into first) when you are coming to a stop. If you just had the carbs rebuilt and it DIDN'T do this before the rebuild, find and reconnect the wire.
I thought the switch in the carb was ground if no accelerator, and nothing if accelerator depressed. But that may be different on your car. And I might have that backwards.
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, ...