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.
To effectively diagnose the non-functional cruise control in your 1990 Jaguar XJ6, start by examining the vacuum system, as it plays a crucial role in the operation of the cruise control. Begin with a thorough inspection of the rubber bellows for any signs of damage or leaks, as these can significantly impact performance. Next, check the booster hose that connects the brake booster to the intake; any issues here could also disrupt the vacuum needed for cruise control functionality. Pay close attention to the O-rings on both the booster and the purge valve plastic lines, as leaks in these areas are common culprits. Additionally, look for any vacuum leaks throughout the vehicle, as they can prevent the cruise control from engaging properly. Ensure that the cruise control bellows are sealed and that the vacuum line remains intact, as any breaches can lead to failure. Finally, inspect the sensor located behind the grill for corrosion, which can affect its performance. By following these initial steps, you can systematically identify and address the issues affecting your cruise control system, paving the way for a successful DIY repair.
While the non-functioning cruise control in a 1990 Jaguar XJ6 may not pose an immediate safety risk, it is essential to recognize the potential consequences of neglecting this issue. A malfunctioning cruise control system can lead to increased driver fatigue, especially during long drives, as it removes the convenience of maintaining a steady speed without constant manual input. Additionally, if the underlying cause of the malfunction is a simple fix, such as a blown fuse or a faulty switch, addressing it sooner rather than later can save you from more extensive repairs down the line. Ignoring the problem could lead to further complications, particularly if the issue is indicative of a larger electrical problem within the vehicle. Therefore, while it may not be urgent, taking the time to diagnose and repair the cruise control system can significantly enhance your driving comfort and prevent potential future issues, making it a worthwhile consideration for any Jaguar owner.
See what others are asking about their Jaguar XJ6. Get answers from RepairPal's community of auto experts and enthusiasts.
Read about related problems experienced by other Jaguar XJ6 drivers like you.
