The 1.1-liter, three-cylinder Mitsubishi 3A91 engine was assembled by the company between 2004 and 2012, but it was only installed on the sixth generation Colt model and its equivalent Smart hatchback. Such a power unit is referred to as the Mercedes M134 in the Daimler-Chrysler company’s nomenclature.
The 3A90 and 3A92 engines are also part of the 3A9 family.
The engine was mounted on:
- Mitsubishi Colt 6 (Z30) in 2004 – 2012;
- Smart Forfour 1 (W454) in 2004 – 2006.
Specifications
| Production years | 2004-2012 |
| Displacement, cc | 1124 |
| Fuel system | distributed injection |
| Power output, hp | 75 |
| Torque output, Nm | 100 |
| Cylinder block | aluminum R3 |
| Block head | aluminum 12v |
| Cylinder bore, mm | 75 |
| Piston stroke, mm | 84.8 |
| Compression ratio | 10.5 |
| Features | DOHC |
| Hydraulic lifters | no |
| Timing drive | chain |
| Phase regulator | MIVEC |
| Turbocharging | no |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 3.2 |
| Fuel type | petrol |
| Euro standards | EURO 4/5 |
| Fuel consumption, L/100 km (for Mitsubishi Colt 2005) — city — highway — combined |
7.0 4.6 5.5 |
| Engine lifespan, km | ~220 000 |
| Weight, kg | 92 |
Disadvantages of the Mitsubishi 3A91 engine
The primary issues with this power unit are solely related to lubricant consumption; in the early years, there were issues with floating speeds, but everyone was treated with firmware;
After 100,000 kilometers of operation, thin piston rings are already present, and an oil burner emerges;
The timing chain frequently needs to be changed after 150,000 kilometers, usually with a phase regulator;
Remember to adjust valve clearances because there are no hydraulic lifters here.