| OEM Cruise Control Acting Strangely [message #307732] |
Sat, 24 September 2016 10:12  |
Chuck and Lureen
Messages: 16
Registered: April 2013
Location: West Michigan
Karma:
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Junior Member |
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My original OEM cruise control system was working well, but recently my cruise control won't engage (or light the green dashboard tell-tale lamp), or stay engaged unless I slightly lift the brake pedal with my toe. Sounded like an out-of-adjustment vacuum release valve, right? So, I readjusted the valve to further depress the spring loaded plunger - no change in operation. I removed the vacuum release valve and bench tested it with my hand vacuum pump and found a very gradual leakdown. I pulled the rubber seat from the valve and found minute age related cracks in the seat area. I then installed a new valve (bench tested OK), thinking my problems were solved but no change, still required a toe lift on brake pedal for proper cruise control operation - even after readjustments. As a test, I plugged the vacuum hose and tested for cruise control - behaves the same, still requiring that the brake pedal be lifted slightly for cruise control engagement or operation, drops out as soon as I move my foot from under the pedal. Brake lights OK and brakes work normally with proper free play and no dragging. What am I missing?
Chuck and Lureen Mullally
West Michigan
1975 Glenbrook
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