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.
When the vehicle speed sensor fails or the wiring harness prevents signal transmission, the speedometer is the first thing that will stop functioning properly. This can be an intermittent issue where the speedometer only works occasionally, the speedometer may cease all function, or the speedometer may read erratically or incorrectly. Also, the traction control and anti lock brake warning lights specific to each vehicle may be illuminated, depending on the design of those systems. You may notice the vehicle hesitate to accelerate, cruise control will not function properly, and the vehicle may not shift properly through all of the gears.
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.
A faulty cruise control module will simply result in deactivation of cruise control settings. This is because a detected error in the cruise control system could lead to hazardous driving conditions, so the module will be disabled, and the cruise control system warning light will be displayed. This will be a different message depending on make and model, and a warning light or message may be displayed on the driver instrument cluster.
When troubleshooting the cruise control issue in a 1998 BMW 328i, it's essential to adopt a systematic diagnostic approach. Begin by checking the brake light switch, as a malfunctioning switch can prevent the cruise control from engaging. Utilize a scanner to assess the switch's status within the vehicle's computer system. Next, inspect the fuses and relays associated with the cruise control; blown fuses or faulty relays can disrupt functionality. Following this, test the cruise control switch located on the steering column, ensuring it registers correctly when activated. If issues persist, examine the wiring and connections for any faults or loose ends that could hinder performance. Finally, connect a diagnostic scanner to the OBD port to retrieve error codes and live data, which can pinpoint specific problems within the system. By following this structured approach, you can effectively diagnose and address the cruise control issues in your BMW, potentially saving time and repair costs.
When dealing with cruise control issues in a 1998 BMW 328i, it's essential to understand the common problems that may arise. Start by inspecting the fuse associated with the cruise control system, as a blown fuse can completely disable its functionality. Next, examine the cruise control buttons and switches located on the steering wheel or dashboard; any wear or damage here can hinder operation. The brake light switch is another critical component, as it ensures that the cruise control disengages when the brake pedal is pressed. If this switch malfunctions, it can prevent the cruise control from engaging altogether. Additionally, check the throttle and cruise control cables for signs of wear or misalignment, as these can impede the system's performance. Electrical issues, such as bad solder joints or loose wiring connections, can also disrupt the cruise control functionality. Lastly, consider the impact of the Mass Airflow Sensor (MAF) on the cruise control system, as its failure can indirectly affect performance. By systematically addressing these areas, you can effectively diagnose and resolve the cruise control issues in your BMW, ensuring a smoother driving experience.
When it comes to the non-functioning cruise control in a 1998 BMW 328i, the urgency to address the issue largely hinges on the context of your driving habits. While the malfunction does not pose an immediate safety risk—since the system is designed to disengage when the brake is applied—it can lead to increased driver fatigue during long trips. This inconvenience can detract from the overall driving experience, especially for those who frequently embark on extended journeys. Although the lack of cruise control may not necessitate immediate action, it is advisable to diagnose and repair the system at your earliest convenience. Ignoring the issue could lead to further complications, particularly if the underlying cause is related to critical components like the brake light switch or wiring. Therefore, while the urgency may not be high, addressing the malfunction can significantly enhance comfort and prevent potential future repairs, making it a worthwhile endeavor for any DIY enthusiast.
See what others are asking about their BMW 328i. Get answers from RepairPal's community of auto experts and enthusiasts.
Read about related problems experienced by other BMW 328i drivers like you.