- The problem
- 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.
- The risk
- In the event the primary throttle return fails, failure of the secondary throttle return system would not provide protection against loss of throttle control.
- The fix
- A new production secondary throttle return system configuration will be installed.
Acceleration & cruise control
1990 Mack MR Acceleration problems
No owner has filed a complaint about the 1990 Mack MR's acceleration & cruise control with NHTSA. Unintended acceleration, surging, throttle problems and cruise or adaptive cruise faults.
- Complaints
- 0
- Recalls
- 1
- Crashes
- 0
- Fires
- 0
- Injuries
- 0
- Deaths
- 0
Acceleration recalls for the 1990 Mack MR
Acceleration complaints
No complaints about this area yet.
Mack MR acceleration complaints by year
MR acceleration problems, every yearSource: U.S. National Highway Traffic Safety Administration (NHTSA) complaints and recalls, checked . Complaints are owners' own reports and are not verified. How we use the data