1991 Mack FDM Problems: 0 Complaints, 3 Recalls

The worst 1991 Mack FDM problems

Ranked by number of owner complaints. Mileage and cost come from what owners wrote.

Tap a problem to see which part fails, at what mileage and in which other years.

Vehicle speed controlReported February 15, 1994 · 39,777 vehicles affected

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

Power train: drivelineReported November 1, 1993 · 130 vehicles affected

What is wrong: The driveshaft to the front driving axle is secured to a bracket using two pillow blocks. These blocks are of insufficient strength to support the driveshaft and could fail.
Risk: Pillow block failure allows the driveline (jackshaft)to drop down onto the roadway and create a safety hazard to other vehicles.
Remedy: Mack will install thicker pillow blocks and support u-bolts.

Recall number 93V176000 · Recall details

Engine and engine cooling: cooling system: fanReported August 20, 1993 · 11,000 vehicles affected

What is wrong: The engine cooling fan blades may break due to inadequate blade strength around the rivets that attach the blades to the fan spider.
Risk: If complete fracture of the fan blade occurs, it couldbe propelled outside the fan shroud, injuring person(s) in the vicinity ofthe truck.
Remedy: An improved fan will be installed on these vehicles.

Recall number 93V137000 · Recall details

Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.

Used buying checklistWhat to check on a 1991 Mack FDM before you buy

Is the 1991 Mack FDM reliable?

Owners have filed 0 complaints about the 1991 Mack FDM.

What is the most common problem with the 1991 Mack FDM?

There are not enough complaints to tell.

How many recalls does the 1991 Mack FDM have?

3 recalls, covering vehicle speed control, power train and engine and engine cooling.

See the problems and recalls for an exact car

Check the exact car before you pay: accidents, salvage or flood titles, odometer readings and previous owners.