Curing Your C4’s Cruise Control
Another way to check the servo is to push in the diaphragm and put your finger against the dump servo. It should hold the diaphragm until you remove your finger.
At this point, Chris says you should have found the problem, and that he’s never replaced the instrument cluster due to a cruise control problem. If you feel your cruise control may be the problem, Chris suggests you purchase a shop manual for your Corvette before progressing any further. We got our ’85 shop manual through Mid America Designs. You’ll be dealing with electrical systems directly, and the potential for doing damage increases greatly once you remove the instrument cluster. If you don’t have a shop manual and aren’t comfortable working on sensitive electronics, seek out professional help. View Related Article
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