Verdict · NHTSA data
Limited data — recalls on file
NHTSA has just 0 complaints on file for the 1991 Mack RW — too few to judge reliability from owner reports alone — but 2 recall campaigns apply to this year, so any used example should have its VIN checked for completed recall work.
0
NHTSA complaints
2
Recalls
0
Investigations
0
Crash-involved
0
Fires reported
0
Injuries
0
Deaths
—
NCAP overall
2 NHTSA recall campaigns on file. Recall repairs are free at franchised dealers.
Defect
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.
Consequence
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.
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.
Consequence
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.
The record is thin — 0 NHTSA complaints — so owner-report data can't strongly confirm reliability either way, though 2 recalls should be verified as completed.
Yes — NHTSA lists 2 recall campaigns affecting the 1991 Mack RW. Recall repairs are free at franchised dealers; check the VIN at nhtsa.gov/recalls to confirm the work was done.
Based on NHTSA ODI data through June 2026. Complaints are consumer-reported and unverified. Updated July 5, 2026.
Compiled by Sharon Ben-Moshe, Founder.