The Mitsubishi Triton has long been a favourite in the Australian ute market, offering a compelling mix of value, toughness, and practicality. While generally regarded as a reliable workhorse, every generation—from the MN to the more recent MQ and MR—has its own set of common issues that owners should be aware of.
EGR Soot Build-Up (4N15 2.4L Engine)
A prevalent issue in the MQ and MR Triton models equipped with the 2.4L MIVEC turbo-diesel engine (4N15) is the build-up of carbon and soot in the Exhaust Gas Recirculation (EGR) system and intake manifold.
Symptoms
- Gradual loss of power and throttle response.
- Increased fuel consumption.
- A "Check Engine" light, sometimes with fault codes related to airflow.
The Cause
The EGR system redirects exhaust gas back into the intake to reduce emissions. However, when this gas mixes with oil vapour from the crankcase ventilation system, it forms a thick, tar-like soot that clogs the intake manifold and EGR valve over time. Many owners recommend installing an oil catch can to reduce the amount of oil vapour entering the intake and performing a manual intake clean every 80,000-100,000 kilometres.
Rear Suspension Sag
The Triton is known for having a softer rear suspension setup compared to rivals like the Toyota Hilux. This provides a more comfortable ride when unladen but can lead to significant sag when carrying heavy loads or towing.
Symptoms
- The rear of the ute sits noticeably lower than the front, especially when loaded.
- A "bouncy" or less controlled feeling from the rear end when driving over bumps.
- Headlights pointing upwards at night.
The Fix
This is less a "problem" and more a characteristic of the factory suspension. For owners who frequently carry heavy tools or tow a trailer, the most effective solution is to upgrade the rear leaf springs to a heavy-duty aftermarket set. Adding airbags can also help to level the ride when towing.
MN Triton (2009-2015) Suction Control Valve (SCV) Issues
The previous generation MN Triton, with the 2.5L 4D56T engine, was known for issues with the Suction Control Valve in its common-rail diesel fuel system.
Symptoms
- Engine surging or running rough, particularly under light load.
- Stalling at idle or when coming to a stop.
- A "limp mode" or check engine light.
The Cause
The SCV regulates the amount of fuel entering the high-pressure fuel pump. When it becomes worn or contaminated with dirty fuel, it can fail to operate smoothly, causing erratic fuel pressure. Replacing the SCV is a common fix and is often done as a preventative measure by owners.
Automatic Transmission Shifting Concerns
Some owners of MQ and MR Tritons have reported occasional issues with the automatic transmission, such as harsh shifting or a delay when selecting Drive or Reverse.
What to do
Often, these concerns can be addressed with a transmission fluid flush and replacement, as the factory fluid can degrade over time. In some cases, a software update from a Mitsubishi dealer can also improve the transmission's shift logic. It's crucial to use the correct specification of automatic transmission fluid (ATF), such as Mitsubishi's own DiaQueen ATF-PA.
Keeping on top of servicing is the best way to ensure your Triton remains a dependable ute. If you're experiencing any issues, TorqueBot can help you narrow down the cause based on your specific model and symptoms.
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