Fuel injection system reconfiguration to comply with engine emission standards cause higher engine vibration levels which lead to early wear and complete failure of the secondary throttle return mechanism.
Acceleration & cruise control
Mack MHR Acceleration problems by year
0 complaints filed with NHTSA about the Mack MHR's acceleration & cruise control. Unintended acceleration, surging, throttle problems and cruise or adaptive cruise faults.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) complaints and recalls, checked daily. Complaints are owners' own reports and are not verified. How we use the data