1. Vacuum System: Cruise control in many cars, including the Intrique, relies on a vacuum system to control the throttle.
* Check Vacuum Lines: Inspect all vacuum lines connected to the cruise control servo (the actuator that moves the throttle). Look for cracks, leaks, or disconnections. These lines are often small and brittle with age.
* Vacuum Pump/Manifold: Ensure the engine's vacuum pump (or the manifold's vacuum source) is producing sufficient vacuum. A low vacuum reading will prevent proper cruise control operation. You'll likely need a vacuum gauge to check this.
2. Cruise Control Servo (Actuator): This is the component that mechanically controls the throttle.
* Visual Inspection: Look for any obvious damage to the servo itself.
* Functionality Test (Requires Caution): With the engine running, carefully try to manually move the servo arm (disconnect it from the throttle linkage first!). It should move freely and easily. If it's stiff or doesn't move, it might be faulty. Caution: Improperly manipulating the throttle linkage can damage your engine.
3. Cruise Control Switch/Module: The switch on the steering wheel might be faulty or have an internal connection problem. The cruise control module (often under the dash) could also be malfunctioning.
* Switch Testing: This usually requires a multimeter to check continuity and voltage at the switch terminals. A faulty switch will have interrupted circuits or incorrect voltage readings.
* Module Inspection: Accessing the module (which may require removing parts of the dash) and visually inspecting it for damage is a good start, but you usually need diagnostic equipment to fully test it.
4. Speed Sensor: The cruise control needs input from the vehicle speed sensor to maintain speed. A faulty sensor will prevent the system from working correctly.
* Check the Sensor: This usually involves checking the sensor's wiring and connection, and possibly using a scan tool to read the sensor's output speed. The sensor location varies by model year, so consult your repair manual.
5. Wiring and Connections: Over time, wiring can become damaged or corroded.
* Inspect Wiring Harnesses: Check all wiring related to the cruise control system for breaks, chafing, or corrosion, paying close attention to the connectors.
6. Brake Switch and Clutch Switch (Manual Transmission): These safety switches prevent cruise control from activating when the brakes are applied or the clutch is depressed.
* Check Functionality: Ensure these switches are working correctly and making proper connections.
7. Fuse: Check the fuse associated with the cruise control system in your car's fuse box.
What to do:
1. Consult a Repair Manual: Obtain a repair manual specific to your 2002 Oldsmobile Intrique. This will provide diagrams and detailed information on the cruise control system and its components.
2. Visual Inspection: Begin with a thorough visual inspection of all the components mentioned above.
3. OBD-II Scan Tool: Use an OBD-II scan tool to check for any diagnostic trouble codes (DTCs) related to the cruise control system. This can help pinpoint the problem.
4. Professional Help: If you're not comfortable working on your car's electrical system, take it to a qualified mechanic. Diagnosing cruise control issues can be challenging, and improper repair attempts could cause further damage.
Remember safety first when working on your car. Disconnect the battery's negative terminal before starting any electrical work.
