Georgia Fiero Club Forum
All Things Fiero => Tech Tips, Tech Questions => Topic started by: GTRS Fiero on October 15, 2020, 07:00:38 pm
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It has happened, before, but my Fiero is falling off cruise control. The frequency that this occurs is increasing. It had happened, but maybe once in 500 miles. Now, it can happen 8 times in 20 miles.
I am guessing a short, but no idea where to look.
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My cruise problems were rust holes in the vacuum canister on one and a failing dump solenoid on another. Once after working under the dash I had to readjust the cruise switch on one of the pedals. I had done something that made it too sensitive.
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Well, mine has a digital cruise control, so no canister or dump solenoid. It could be the brake switch at the pedal. No clutch on mine.
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Push it to the floor and leave it there...... shouldn't fall off then
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Well, guys with guns....you test that for me. I'm sure you'll do fine.
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Could my cruise issue be related to the vacuum leak? I know my cruise is digital, but maybe somehow it feels that things aren't right, and kills the cruise.
Twice, I heard a sound when the cruise disengaged.
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Do you want me to send you my base? You can try it and see if it solves the problem. If it does, you could have a machine shop do a very light flycut on yours to resurface it. Then send mine back to me.
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No idea what a flycut is. I have 2 other bases. It did the same thing with them. The issue is the surface of the crossover pipe.
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I would try that Permatex only like we discussed and if not try the groove and ring it. But might be best to get the crossover pipe off. Have it resurfaced and reassemble it off the car. Maybe even ditch the studs for bolts. If it wasn’t for cleaning and two dissimilar metals I’d say weld the base on or have a good machine shop make one out of steel and weld it on.
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Flycut is a tool used on a milling machine to impart a very smooth cut surface on a metal. The smoothness of the finish depends upon the speed of travel of the bed as it passes underneath the flycut tool. It's a disk with carbide cutting bits attached.
https://www.wisegeek.com/what-is-a-fly-cutter.htm
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The Permatex was the red stuff that melted and glopped all over everywhere.
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Did you use the correct one? Red will not withstand that kind of temperature.
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I purchased a tube. We'll see if it works, or not, once it arrives.
There is a construction tent over by the hospital that I plan to appropriate to do this without the Gestapo bothering me.
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Fingers crossed for you.
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Now, my cruise isn't working, at all. I'm going to try a new stalk.
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New stalk, no change.
Tested every pin on the connector. Each pin works as expected, other than the VSS. For the VSS pin, there is no voltage. Even while the vehicle is moving, nothing. I suspect a scope is required, but I don't have one. Certainly, nothing shows on a digital multi-meter. Any way to test the VSS signal?
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I had a cruise problem on one of my 85's. The cruise would set, but then it would gradually fall off. Sometimes it would recover and accelerate wildly. I found that the vacuum canister had rusted through on the bottom surface where it wasn't readily available. I know yours is a digital cruise, but does it use a vacuum in any way?
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Nope. No vacuum.
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Well, it has totally fallen. Fallen cruise. I suspect that either the bridge failed, or the wiring between the ECU and the cruise module is electrically distancing.