Poor fuel economy and sluggish throttle response are common complaints for C6 owners. Many have found success in addressing these issues using VCDS to perform a throttle body adaptation. This post explores the process and results of using VCDS for fuel-related adjustments on a C6 experiencing low gas mileage (12.5 mpg) compared to the expected 15-18 mpg. The goal was to improve fuel efficiency and responsiveness.
Understanding the Problem and Solution
The owner calculated fuel economy manually (miles driven/gallons used) rather than relying on the car’s computer. The sluggish response, a common issue in C6s, was noticeable particularly in city driving conditions with short trips. Highway driving previously masked this problem. Throttle body adaptation using VCDS is a known solution to address this sluggishness and potentially improve fuel consumption.
Initial Fuel Pump Checks with VCDS
Before the adaptation, VCDS was used to monitor fuel pump operation. Readings showed a fuel pressure of 5 BAR and a duty cycle of approximately 22%. These values changed appropriately with variations in gas pedal position, indicating a properly functioning fuel pump. However, the absence of the “ADP OK” message, typically displayed after a successful adaptation, raised concerns about procedure or whether the instructions applied only to new fuel pump installations.
Throttle Body Adaptation Procedure and Results
While the original intent was solely throttle adaptation, further diagnostics were performed. The lack of “ADP OK” prompted investigation. (Specific steps within VCDS to initiate and complete the throttle body adaptation would be beneficial here. Screenshots from VCDS could further illustrate the process). Did the adaptation ultimately complete successfully despite the lack of “ADP OK?”
Post-Adaptation Fuel Economy and Performance
After the VCDS adjustments, what were the observed changes? Did fuel economy improve? Was the throttle response noticeably more responsive? Quantifiable results (e.g., MPG before and after, 0-60 times) will add significant value. Any unexpected outcomes or challenges encountered during the process should also be documented.
Conclusion
Using VCDS to perform a throttle body adaptation is a potential solution for improving fuel economy and throttle response in C6 vehicles. While the initial results seemed promising with a functioning fuel pump, the missing “ADP OK” message requires further investigation. Sharing specific VCDS procedures and quantifiable results will help others facing similar issues. Further exploration into the root cause of the missing “ADP OK” and long-term effects of the adaptation on fuel consumption is recommended.
