Use cruise servo as idle control/hand throttle?
Is it possible to override the cruise control servo for idle control/hand throttle instead of using a manual cable? I know the tan/red wire is the vacuum and the lt green/red wire is the vent control, but I don't know how these cruise controls and servos work. I don't want to mount a cable and I think it'd be pretty custom to mount a switch just like they have in big trucks for the cruise and PTO throttle control.
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not sure you need to be able to apply power to one to make it work i would check it with it on if you have a dynometer avalible
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Yes.
I made a circuit to simulate the VSS on a chevy and wired it to the electric cruise box. I can put my idle wherever I want on my gmc using a variable dial :jump::jump: I have cruise on my first gen.. i'll look into it but i'm pretty sure it runs off vacuum? that would be a bit harder to do. |
The servo is electric over vacuum. There are four wires from PCM: 12V positive, ground, vent & vacuum. I was assuming applying 12V to the vacuum wire with cruise on would apply vacuum & pull the throttle just like bumping the cruise up - except wiring in a separate switch. Apparently the PCM won't let me do this cuz it's not getting a signal from the VSS that the truck is moving. Wiring a dummy VSS circuit with a pot to control the throttle sounds like an idea, maybe I'll give it a try. It would probably be easier to just throw a cable in for a hand throttle, but definitely not as original. Thanks alot for your help guys. I'm still always open for more ideas though...
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my 90 has a hand throttle in it. dodge brackets an all, never use it since i once forgot it didn't come off with the brakes and dam near smashed the back of a car. :w2:but it does work nice for warming the truck up
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Your truck had a factory hand throttle?
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