- 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.
Vehicle safety record
1991 Mack MR Problems, complaints & recalls
No owner complaints about the 1991 Mack MR have been filed with NHTSA. It is covered by 2 recalls, the latest in February 1994 for the vehicle speed control.
NHTSA data checked
CAbout as many problems as a typical MR year, for its age
- Complaints
- 0
- Recalls
- 2
- Crashes
- 0
- Fires
- 0
- Injuries
- 0
- Deaths
- 0
1991 Mack MR recalls 2
Recall repairs are free. Your dealer fixes them whether or not you bought the car there - check your VIN at nhtsa.gov/recalls to see if yours is done. What to do
- The problem
- The stone bennett shifters do not indicate the relative position of the shift lever to the driver.
- The risk
- The shift lever does not meet the requirements of fmvss102.
- The fix
- Install a decal displaying the relative shift positions.
What owners say
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No complaints about the 1991 Mack MR yet
No owner has filed a complaint about this vehicle with NHTSA. If yours has a problem, share it here and report it to NHTSA.
Mack MR: every year compared
All MR years1991 Mack MR vs rivals
| Vehicle | Complaints | Recalls | Grade | |
|---|---|---|---|---|
| 1991 Mack MR | 0 | 2 | C | |
| 1991 Mack Mack | 1 | 0 | A | Compare |
More sales usually means more complaints, so compare similar vehicles of the same year. The grade compares each vehicle with its own model's other years.
Questions about the 1991 Mack MR
Does the 1991 Mack MR have any recalls?
Yes - NHTSA lists 2 recalls for the 1991 Mack MR: vehicle speed control (February 1994); shift pattern indicator (October 1991). Recall repairs are free at any authorized dealer. Enter your VIN at nhtsa.gov/recalls to see whether yours has been fixed.
How many complaints has the 1991 Mack MR had?
None have been filed with NHTSA so far.
Is the 1991 Mack MR a reliable vehicle?
Its Safety Index is 58 out of 100 (grade C: about as many problems as a typical Mack MR year, for its age). The index weighs complaints, crashes, fires, injuries, deaths and recalls against how long the vehicle has been on the road, compared with the same model's other years. It is not a measure of every repair - read the complaints and owner experiences, and have any used vehicle inspected before you buy.
What should I do if my 1991 Mack MR has a problem?
If it is a safety problem, stop driving it if it is unsafe and contact your dealer. Report it to NHTSA at nhtsa.gov/report-a-safety-problem - enough reports start investigations and recalls - and share your experience here so other owners know what to look for.
Source: 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