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Date registered: Oct 2002
Vehicle: 1967 250 SL, 1963 220Sb
Location: Los Angeles / Altadena
Mentioned: 3 Post(s)
Quoted: 102 Post(s)
108 auto trans clunk - 3 position solonoid - weber carbs
Hi have a 1968 280 S and I'm trying to get the transmission to shift better. I have read up on things and understand that if I take off the inspection cover in the passenger footwell, I can see and feel the modulator solonoid. It has 3 positions - up when the accelerator is not being pressed, down when the accelerator is floored, and in between when you have the pedal down partway. The kickdown part works correctly. The idle part does not work correctly. The result is the car clunks when it downshifts coming to a stop.
As I understand it, two wires go to a switch on the carb or on the linkage that closes the circuit when the gas pedal is not pushed, and opens it when the pedal is pushed. The problem is that I can't find where these wires connect to the car. I have the wires and have proved to myself that by connecting the two wires together the transmission does not clunk when coming to a stop. The problem is that I have weber carbs on my car and I'm wondering if the switch that is supposed to close this circuit simply doesn't exist...
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, ...