The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.
When the throttle position sensor fails, the engine's computer tends to overcompensate with fuel, leading black exhaust coming from the tailpipe. There is a strong possibility of engine misfires, and the check engine light will come on.
Throttle position sensors can also develop "dead spots," or certain places along the throttle curve where it doesn't get a reading. When this happens, the above symptoms can occur but then stop when you further press or let off the gas pedal.
In the event that a wheel speed sensor fails, the ABS, traction control system (TCS) and manufacturer specific stability control system lights will illuminate, informing the driver that the systems are disabled. The vehicle will be more prone to tire slip, and normal driving patterns may need to be adjusted to correct for the loss of computer control. On older vehicle's, the speedometer can be affected, causing illumination of the check engine light as well.
If the cruise control refuses to turn on at all, the actuator could be at fault. Likewise, if the cruise control stays on but does not maintain a consistent speed, the problem could be a bad actuator. In extreme cases, a malfunctioning actuator could cause the throttle to stick and prevent the vehicle from slowing down. These symptoms may point to a bad actuator. They may also point to other problems with the cruise control and related systems.
The cruise control switch can cause complete failure of the cruise control feature, but in a lucky scenario only partial functionality will be lost. This means that the cruise control may come on, but that it will not increase in speed automatically, or the cancel button does not work leading the driver to cancel cruise control with the foot brake. In some vehicles, the cruise control light may illuminate, or a warning message may be displayed due to lack of functionality.
When troubleshooting a non-functional cruise control system in a 1991 Land Rover Range Rover, it's essential to adopt a systematic diagnostic approach. Start by checking the basics, such as ensuring the cruise control light illuminates on the dashboard when activated, as this indicates power to the system. Next, inspect the vacuum system, focusing on all connected lines for leaks or blockages, particularly around the vacuum pump located near the left headlight. Following this, verify the integrity of electrical connections and fuses related to the cruise control system, ensuring that the CC ECU, typically found behind the glove box, has secure and undamaged wiring. The brake pedal switch is another critical component; test it using a voltmeter to confirm it disengages the cruise control appropriately. Additionally, assess the vehicle speed sensor for proper functionality by checking voltage variations while spinning a rear tire. Finally, examine the throttle actuator and vacuum pump for any signs of damage and test their operation. By following this structured approach, you can effectively identify and address the issues affecting your cruise control system, making the troubleshooting process more manageable and efficient.
When troubleshooting cruise control issues in a 1991 Land Rover Range Rover, it's essential to consider several common problems that could be at play. One of the primary culprits is the Cruise Control ECU (Electronic Control Unit), which can fail and disrupt the entire system. To test the ECU, check if it controls other functions, such as the sunroof delay and window operation after the ignition is off; if these features are non-functional, the ECU may need replacement. Additionally, the vacuum system plays a critical role in cruise control operation. Inspect the vacuum pump, typically located near the left headlight, and ensure it is working correctly. Look for any leaks or damage in the vacuum lines and verify that the actuator is holding a vacuum without cracks. Electrical issues can also hinder cruise control functionality, so check the wiring and connections to the vacuum pump and ECU for signs of wear or corrosion. A faulty cruise control relay can prevent the system from engaging, so ensure it is present and operational. Furthermore, the speed transducer, located near the gearbox, must be intact and connected, as it provides essential speed data to the cruise control system. Lastly, the brake cut-off switch should be functioning correctly to disengage cruise control when the brake pedal is pressed. By systematically examining these components, you can effectively diagnose and resolve cruise control issues in your Range Rover.
While the cruise control system in your 1991 Land Rover Range Rover is not a critical safety feature, neglecting its repair can lead to increased driver fatigue during long trips, making your driving experience less enjoyable. The convenience of cruise control is particularly valuable on extended journeys, as it allows for a more relaxed driving posture and can help maintain consistent speeds, reducing the strain on your foot and leg. However, if you notice symptoms such as erratic behavior or complete failure of the system, it’s advisable to investigate the issue sooner rather than later. Ignoring these signs could lead to more complex problems down the line, potentially involving costly repairs to the cruise control module or other components. Therefore, while immediate action may not be necessary for safety reasons, addressing the malfunction promptly can enhance your driving comfort and prevent further complications, making it a worthwhile DIY project for any Land Rover enthusiast.
Read about related problems experienced by other Land Rover Range Rover drivers like you.
See what others are asking about their Land Rover Range Rover. Get answers from RepairPal's community of auto experts and enthusiasts.
