The 2.0-liter Mitsubishi 4G94 engine was produced from 1999 to 2007 and was installed in various models of the company’s cars. In 2008, the rights to this engine were sold to Chinese automakers. The engine was offered in two main versions: with injector (SOHC) and with direct fuel injection (DOHC GDi), each of which had its own features and advantages.
Mitsubishi was one of the first manufacturers to actively introduce direct fuel injection (GDI) technology into mass production. The 4G94 GDI was one of the key models that utilized this system. Unlike traditional multi-point injection, the GDI system injected fuel directly into the combustion chamber under high pressure. This increased fuel efficiency, improved power and reduced emissions.
Mitsubishi 4G94 engine specifications
| Parameter | 4G94 MPI SOHC | 4G94 GDI DOHC |
|---|---|---|
| Determined displacement | 1999 cm³ | 1999 cm³ |
| Power System | Injector | Direct injection |
| Power | 125 hp | 145 hp |
| Torque | 176 Nm | 191 Nm |
| Cylinder block | Cast iron R4 | Cast iron R4 |
| Cylinder head | Aluminum 16v | Aluminum 16v |
| Cylinder diameter | 81.5 mm | 81.5 mm |
| Piston stroke | 95.8 mm | 95.8 mm |
| Compression ratio | 9.5 | 11 |
| Hydrocompensators | Yes | Yes |
| Transmission timing | Belt | Belt |
| Fasoregulator | No | No |
| Turbocharger | No | No |
| Oil | 3.8 liters 5W-30 | 3.8 liter 5W-30 |
| Ecological class | EURO 3 | EBRO 4 |
| Example service life | 300,000 km | 250,000 km |
| Engine weight | 150 kg | 150 kg |
Difference between GDI and MPI versions
It’s worth noting that the 4G94 was available in both a traditional multi-point fuel injection (MPI) version and a GDI system. The GDI version was more advanced and had better fuel economy and emissions, but the MPI version was easier to maintain and less prone to valve fouling problems.
Models of vehicles with the engine
- Mitsubishi Galant 8 (EA): 2000 – 2006
- Mitsubishi Lancer 9 (CS): 2000 – 2007
- Mitsubishi Pajero Pinin 1 (H67): 1999 – 2007
- Hawtai Santa Fe 1: 2009 – 2015
Main problems and defects of the 4G94 engine
- Fuel Sensitivity (GDI version): GDi models are very demanding on fuel quality, which can cause engine performance problems.
- Hydrocompensator failure: All versions of the engine often suffer from hydrocompensator failure, which requires regular repairs.
- E idle speed regulator (ESC) problems: The engine may stall when hot due to a faulty idle control valve.
- Oil and ring galling: After 100-150 thousand kilometers, piston rings often gall, which leads to increased oil consumption.
- Risk of liner rotation: A drop in oil pressure increases the likelihood of liner rotation, which can cause serious engine damage.
Maintenance of the 4G94 GDI engine: experience and opinions of Mitsubishi owners
Many owners of Mitsubishi cars with 4G94 GDI engine encounter various problems and share their experience of solving them. This engine often causes controversy among motorists, especially those who have been operating it for a long time in Russian conditions. Let’s consider a few key opinions and solutions that will help to better understand how to ensure reliable engine operation and extend its life.
Oil degradation and its solution
Many Mitsubishi owners, such as those who have the 4G94 GDI engine installed, face the problem of increased oil consumption. One example is the case when the car consumed up to a liter of oil for every 1000 kilometers. The solution to the problem was quite simple: piston rings and oil caps were replaced. After that, the engine stopped consuming oil, and further consumption stabilized. The owner started using KIXX 5W30 engine oil, which allowed him not to worry about checking the oil level between oil changes.
Peculiarities of GDI operation
Not all owners realize the importance of timely and quality maintenance, which also leads to deterioration of the engine.
However, despite this, many owners note that with proper care and adherence to the regulations, a GDI engine can last a long time without any problems. The key is to use quality fuel and regular maintenance. Also important is the correct choice of oil and its regular replacement, which helps to extend the life of the engine.
Conclusion
4G94 GDI engines can be reliable if you keep an eye on them, use quality fuel and oil, and perform the necessary work in a timely manner. However, as with any complex unit, lack of proper care leads to problems. Experience shows that for successful operation of such engines it is important to pay attention to even small things, such as regular replacement of filters, plugs and thorough diagnostics of the injection system.