The worst 1991 Mack RW problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
Problems by type
Tap a problem to see which part fails, at what mileage and in which other years.
Recalls 2
Vehicle speed control
- What is wrong
- The hand throttle cable passes through the accelerator rod assembly at an angle that wears a groove in the rod, which is located under the accelerator pedal. The cable can become wedged in the groove worn into the rod and cause the accelerator to stick in an open position.
- Risk
- This can result in loss of control of the bus, and could result in an accident.
- Remedy
- Dealers will install a positioning bracket for routing the hand throttle cable through the accelerator rod assembly.
Recall number 94V136000 · Recall details
Vehicle speed control
- What is wrong
- 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.
- 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.
- Remedy
- A new production secondary throttle return system configuration will be installed.
Recall number 94V032000 · Recall details
Technical service bulletins for the 1991 Mack RW 22
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- US10 Emission Engines
- Automated Manual Transmission ( AMT ) I-Shift / mDRIVE
- (Back Office)
- Programming Failure
- NOx Sensor Troubleshooting Guide
- Use for new vehicles (US21+OBD22
- Selective Catalytic Reduction (SCR) Muffler Troubleshooting Guide
- DEF Pump Troubleshooting Guide
- Temperature Sensor Troubleshooting Guide
- Mack Chassis
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Questions about the 1991 Mack RW
Is the 1991 Mack RW reliable?
Owners have filed 0 complaints about the 1991 Mack RW.
What is the most common problem with the 1991 Mack RW?
There are not enough complaints to tell.
How many recalls does the 1991 Mack RW have?
2 recalls, covering vehicle speed control.
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