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Q:Why does it disengauge for no reason ? This is a 1983 Mustang. It does not have a computer.
A:In order to best answer your question, we will need more information from you regarding your project. You can call us directly at 1-877-ADVANCE (238-2623) and our technicians would be more than happy to assist you further.
Q:What would cause it to disengauge for no reason ?
A:It seems the VSS should be the possible cause of the problem as VSS sends its signal to the PCM. The PCM then has a speed ouput which is used by the cruise control module, speedometer, and passive restraint control module. If the VSS was acting up your speedometer probably would be misbehaving, and the airbag dummy light would proably be lit up on the dash.However, I would suggest taking your vehicle to a certified mechanic for a proper diagnosis for sorting the issue to avoid intermittence.
Q:I have a 1989 F250 7.3l diesel. How do you check the existing unit to determine if it has failed.
A:Open the fuse panel under the steering wheel by pulling up on the fuse panel release lever and pulling the fuse panel down. Check the fuses for the brake lights and the cruise control. Use the diagram on the underside of the fuse panel lid to locate both of these fuses. If the brake lights don't work or the fuse for them (or the cruise control module) is burnt or damaged, the system will not work. Start the vehicle and check the vacuum lines on the intake and brake booster. A vacuum leak will prevent the cruise control system from functioning properly. Check the throttle cable. Damaged or frayed throttle cable will prevent the cruise control from being able to precisely control the throttle. Shut off the vehicle and disconnect the negative battery cable. Loosen the retaining nut on the negative battery cable and slide the cable off the cable clamp. Check the cruise control module and combination stalk. These units rarely, if ever, fail. However, if the unit is bad, you'll want to know. Remove the screws holding the steering wheel column cover in place and pull the cover off the steering column with your fingers. Unplug the electrical plug from the cruise control switch and remove the screws holding the cruise control stalk to the steering column. Replace the unit with a new stalk to confirm or deny switch failure.