cruise control is very weak

Asked by Gearup Dec 28, 2012 at 12:26 PM about the 1986 Oldsmobile Cutlass Supreme

Question type: Maintenance & Repair

Cruise control will hold at 65mph on fairly level ground but when a average incline is extended for about 2miles as on a long stretch of highway, it will slowly loose speed, about 8-10 mph untill the road flattens out again. You can feel the cruise control trying to work but is very weak. Is it the computer or maybe the vacume plunger or something else. How do I check it.

176,095

tenspeed answered 11 years ago

I would check the vacuum hose that feeds vacuum plunger. It could be the vacuum plunger itself, but the hoses are easier to check and replace. It could also be the length of the cable going to the throttle plate from the plunger. If it's too slack, it can't open the throttle enough to maintain speed.

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