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I'm curious, again. I was messing with my old cruise control cable, the one that was damaged in the fire that I am replacing. I would grab the end (either end) and push and pull it. The cable is totally free to move about. So I'm wondering why it doesn't work anymore. Take a look at the pic below showing the wire sheathing all frayed. Correct me if I'm wrong, but is that wire sheathing meant as a containment feature for the thin inner wire cable that is actually moving thru the cable? In other words, does that wire sheathing simply keep the thin inner wire cable from bulging or kinking rendering it from doing its job? Kinda like pushing a string where the string bows out but the end stays in the same place??
Yep, pretty much. The servo pulls on the cable, but, if the cable isn't contained, if can just flop about, rather than do the job it was intended to.
Thx...so I see it right. This design would apply to pretty much all cable operated functions. I studied it wrong initially thinking there is opposite pull action at both ends and one simply overrides the other depending on the task at the moment that keeps the cable taught at all times. Not necessarily.
Yep, pretty much. The servo pulls on the cable, but, if the cable isn't contained, if can just flop about, rather than do the job it was intended to.
So does the servo communicate in any way with the speed sensor or is it more rudimentary and simply clamps down on the cable once the SET function is activated in the cab?
Servo is vacuum powered, how much/when it gets it is controlled by the PCM, by just opening/closing a vacuum valve. Apply vacuum, the servo pulls the cable, release the vacuum, spring tension on the throttle lever pulls it back. PCM can modulate the valves, to maintain the set speed regardless of conditions.... Unless you are going down a REALLY steep hill.... In which case, gravity always wins.
And the cruise control works once again. I went the onemore94dak approach and got the servo and cable as one assy (mostly because that's the only thing I could find ). It was an easy job. The used replacement cable is iiiiiiiiiiiiiiiiiidentical to the original (as confirmed by the Hewlett Packard 5710A dual column gas chromatograph with flame analazation detectors...mine was the turbo charged model). I was able to use the original vacuum hoses. Just had to remove them from the replacement part. I'll return the first cable I bought and now I have a spare servo.
So two more jobs post-fire. The AC and I need to repaint the hood to get that burn mark out. Both these jobs were semi planned anyway. The AC because it is getting weaker and it still has R12 in it and repainting the hood (and roof) because the clear coat is all but gone. No hurry for either of those jobs and I will wait for cooler weather. I'm too old for this heat.
). It was an easy job. The used replacement cable is iiiiiiiiiiiiiiiiiidentical to the original (as confirmed by the Hewlett Packard 5710A dual column gas chromatograph with flame analazation detectors...mine was the turbo charged model). I was able to use the original vacuum hoses. Just had to remove them from the replacement part. I'll return the first cable I bought and now I have a spare servo.