Many GM truck owners have encountered a peculiar issue: vibrations at certain speeds, particularly during acceleration and deceleration. One experienced truck owner traced a similar problem in their older GMC to the Active Fuel Management (AFM) system. This system, designed to switch between 4 and 8 cylinders to improve fuel economy, can sometimes cause engine issues and vibrations, as the engine was not originally engineered for such variable operation.
The owner’s experience highlights a common frustration with AFM. After ruling out typical culprits like rear-end and driveshaft problems, the AFM system and injectors were identified as the source of a significant vibration issue, potentially leading to costly repairs. To circumvent this, the owner opted for an aftermarket solution: a Range Technologies device. This unit effectively disables AFM, forcing the engine to run in 8-cylinder mode continuously. Interestingly, this resulted in improved fuel mileage for the owner. However, a minor inconvenience was noted: the device would occasionally need to be unplugged and replugged to maintain AFM deactivation after periods of inactivity.
This personal anecdote underscores the potential downsides of AFM and the appeal of AFM delete solutions. For those seeking to eliminate AFM-related problems, including vibrations and potential engine wear, an Obd2 Afm Delete device presents a viable option. These devices plug directly into your truck’s OBD2 port and prevent the AFM system from engaging, ensuring your engine operates consistently in 8-cylinder mode.
While the original story mentions a specific brand, numerous OBD2 AFM delete devices are available on the market. These aftermarket solutions offer a straightforward way to manage or eliminate AFM. By maintaining consistent 8-cylinder operation, drivers may experience smoother performance, potentially resolve vibration issues, and in some cases, even see a surprising improvement in fuel economy, as reported in the original account.
If you are experiencing vibrations or suspect AFM issues in your GM truck, exploring OBD2 AFM delete options could be a worthwhile step to regain optimal performance and driving comfort.
