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.
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.
To effectively diagnose the non-functioning cruise control in your 1991 Pontiac Grand Am, start with a systematic approach that emphasizes simplicity. Begin by performing a thorough cruise control system check, as this will help you identify any error codes that may indicate specific issues, such as DTC's 61/62 or DTC's 1561/1562. Next, inspect the fuses associated with the cruise control system, as a blown fuse is a frequent culprit behind such malfunctions. Additionally, evaluate the condition of the brake pedal and throttle body, since any irregularities in these components can disrupt the cruise control's functionality. By following these initial steps, you can efficiently narrow down the potential causes of the problem and take the necessary actions to restore your cruise control system.
When dealing with a malfunctioning cruise control system in a 1991 Pontiac Grand Am, it's essential to understand the common problems that may be at play. One of the first things to check is the fuse; a blown fuse can easily disrupt the entire system, so inspecting and replacing it if necessary is a straightforward first step. Next, consider the brake pedal switch, which is crucial for the cruise control's operation. If this switch is faulty, it may prevent the system from engaging, as it is designed to deactivate when the brake is pressed. Additionally, vacuum leaks can significantly impact the cruise control's functionality, so examining the vacuum lines for any signs of wear or damage is advisable. Another critical component to inspect is the speed sensor; if it is defective, the cruise control may struggle to maintain a consistent speed. Lastly, the cruise control module itself could be the source of the issue, and if it is found to be faulty, it may require repair or replacement. By systematically checking these components, DIYers can effectively diagnose and potentially resolve the cruise control issues in their Pontiac Grand Am.
When contemplating the urgency of repairing the non-functioning cruise control in a 1991 Pontiac Grand Am, it's essential to weigh the implications of neglecting this feature. While cruise control is primarily a convenience, its absence can lead to increased driver fatigue, especially on long journeys, which may compromise safety. Additionally, if you plan to sell the vehicle, having all features operational can enhance its resale value, making it a worthwhile investment. Furthermore, issues with the cruise control system might signal deeper electrical problems within the vehicle, which could escalate if left unaddressed. Therefore, while it may not be an immediate priority, addressing the cruise control issue can contribute to a safer driving experience, maintain the vehicle's value, and prevent potential complications down the line.
Read about related problems experienced by other Pontiac Grand Am drivers like you.
See what others are asking about their Pontiac Grand Am. Get answers from RepairPal's community of auto experts and enthusiasts.
