The worst 1991 Mack CL problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
Problems by type
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Recalls 2
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
Seat belts: front: anchorage
- What is wrong
- Lap and shoulder seat belt arrangement for fixed (non-suspension) seats does not meet the seat belt loading requirements of fmvss 210. The inboard clinch nut in cab sill, where the buckle for the shoulder and lap belt is mounted, pulled out of the sill during the tests. Consequence of defect: if seat belt anchirage fails, the seat occupant faces an increased risk of injury in an accident or sudden stop.
- Remedy
- Relocate the inboard seat belt mounting from top of the sill to the forward flange of the sill on the cab floor, and add a 3mm fillet weld around the 2 inboard clinch nuts.
Recall number 91V112000 · Recall details
Technical service bulletins for the 1991 Mack CL 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 CL
Is the 1991 Mack CL reliable?
Owners have filed 0 complaints about the 1991 Mack CL.
What is the most common problem with the 1991 Mack CL?
There are not enough complaints to tell.
How many recalls does the 1991 Mack CL have?
2 recalls, covering vehicle speed control and seat belts.
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