Speed Control Surges
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Joined: Sep 2009
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Speed Control Surges
I just finished installing the factory cruise setup on my 78 f150 wiht a 460 with edelbrock carb. Put the rearend up on jackstands and turned the cruise on. The servo will not hold its position, it surges from wide open throttle down to idle then picks back up and does the same thing over and over. Any ideas what could be the problem? I have the vacuum hooked up to the back of the carb.
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I'll drive it tomorrow after work it, can't drive it in heavy traffic cause it doesn't stop very good for some reason.
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MSEE
Joined: Apr 2004
Posts: 10,386
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From: Austin, TX
Are you saying you were "simulating" a driving condition while the rear end of the truck was on jackstands? That is NOT safe. I'm sure someone will fight me on that, but "I do it all the time" is not a logical argument.
Anyway, one of the inputs to the cruise control box is the speed sensor. The cruise control won't work under 35 mph or so (give or take). If you were just idling the engine, the cruise won't work, which would explain what you saw.
Anyway, one of the inputs to the cruise control box is the speed sensor. The cruise control won't work under 35 mph or so (give or take). If you were just idling the engine, the cruise won't work, which would explain what you saw.
