ST400

[big_riv67]

I have a 1967 Buick Riviera. The engine is a 1974 455 with a turbo 400 behind it. There is a little switch mounted on the part of the throttle arm that comes out of the firewall. The switch never actuates no matter how you move the throttle arm. There is a wire harness that comes out of the mystery switch and plugs into the kickdown switch. I thought the switch may have(at one time) been part of some sort of idle compensator for when the AC was on. Can anyone tell me what this switch was or is supposed to do?

 

[Dale]

That switch is for the switch pitch torque converter your car had when new (was the tranny replaced when the '74 455 was installed?) That may explain why it does nothing. The switch pitch converter had adjustable vanes inside that when activated by the switch on the throttle linkage changed the stall speed of the converter.

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1970 Riviera
1996 LeSabre
And many Buicks in the past.