The defect
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 remedy
A NEW PRODUCTION SECONDARY THROTTLE RETURN SYSTEM CONFIGURATION WILL BE INSTALLED.
NHTSA's own wording · initiated by ODI
Vehicles covered
| Model | Model years |
|---|---|
| Mack CF | 1987, 1988, 1989, 1990, 1991, 1992 |
| Mack CH | 1987, 1988, 1989, 1990, 1991, 1992 |
| Mack CHR | 1987, 1988, 1989, 1990, 1991, 1992 |
| Mack CL | 1987, 1988, 1989, 1990, 1991, 1992 |
| Mack DM | 1987, 1988, 1989, 1990, 1991, 1992 |
| Mack DMM | 1987, 1988, 1989, 1990, 1991, 1992 |
| Mack FDM | 1987, 1988, 1989, 1990, 1991, 1992 |
| Mack MC | 1987, 1988, 1989, 1990, 1991, 1992 |
| Mack MH | 1987, 1988, 1989, 1990, 1991, 1992 |
| Mack MHR | 1987, 1988, 1989, 1990, 1991, 1992 |
| Mack MR | 1987, 1988, 1989, 1990, 1991, 1992 |
| Mack R | 1987, 1988, 1989, 1990, 1991, 1992 |
| Mack RB | 1987, 1988, 1989, 1990, 1991, 1992 |
| Mack RD | 1987, 1988, 1989, 1990, 1991, 1992 |
| Mack RM | 1987, 1988, 1989, 1990, 1991, 1992 |
| Mack RW | 1987, 1988, 1989, 1990, 1991, 1992 |
| Mack U | 1987, 1988, 1989, 1990, 1991, 1992 |
Components: VEHICLE SPEED CONTROL
Model years in this recall
NHTSA complaints and the number of recall campaigns for each model year this recall covers.
| Model | Year | Complaints | Recalls |
|---|---|---|---|
| Mack CF | 1987 | 0 | 5 |
| Mack CF | 1988 | 0 | 5 |
| Mack CF | 1989 | 0 | 4 |
| Mack CF | 1990 | 0 | 2 |
| Mack CF | 1991 | 0 | 1 |
| Mack CF | 1992 | 0 | 1 |
| Mack CH | 1987 | 0 | 1 |
| Mack CH | 1988 | 0 | 6 |
| Mack CH | 1989 | 0 | 7 |
| Mack CH | 1990 | 0 | 5 |
| Mack CH | 1991 | 0 | 5 |
| Mack CH | 1992 | 1 | 5 |
| Mack CHR | 1987 | 0 | 1 |
| Mack CHR | 1988 | 0 | 1 |
| Mack CHR | 1989 | 0 | 1 |
| Mack CHR | 1990 | 0 | 1 |
| Mack CHR | 1991 | 0 | 1 |
| Mack CHR | 1992 | 0 | 1 |
| Mack CL | 1987 | 0 | 1 |
| Mack CL | 1988 | 0 | 2 |
| Mack CL | 1989 | 0 | 2 |
| Mack CL | 1990 | 0 | 2 |
| Mack CL | 1991 | 0 | 2 |
| Mack CL | 1992 | 0 | 2 |
| Mack DM | 1987 | 0 | 1 |
| Mack DM | 1988 | 0 | 1 |
| Mack DM | 1989 | 0 | 2 |
| Mack DM | 1990 | 0 | 1 |
| Mack DM | 1991 | 0 | 1 |
| Mack DM | 1992 | 0 | 2 |
Other vehicle speed control recalls in 1994
14 of the 244 recall campaigns reported to NHTSA in 1994 concerned the vehicle speed control; MACK TRUCKS, INCORPORATED filed 245 campaigns in all.
| 94V201000 18 Oct 1994 | WHEELED COACH INDUSTRIES |
| 94V196000 7 Oct 1994 | INTERNATIONAL TRUCK AND ENGINE |
| 94V193000 4 Oct 1994 | BLUE BIRD BODY COMPANY |
| 94V173000 13 Sept 1994 | VOLVO CARS OF NA, INC. |
| 94V136000 19 Jul 1994 | BLUE BIRD BODY COMPANY |
| 94V133000 19 Jul 1994 | INTERNATIONAL TRUCK AND ENGINE |
| 94V104000 8 Jun 1994 | OSHKOSH TRUCK CORPORATION |
| 94V091000 13 May 1994 | MERCEDES-BENZ USA, INC. |
NHTSA recalls (public domain) · all recalls of 1994