What does a EGR Valve do?

The valve controlling your EGR (exhaust gas recirculation) is an important part of your car's engine. It controls the amount of nitrogen oxide emitted into the atmosphere by petrol and diesel engines by recycling part of the exhaust gas back into the engine cylinders.

Mitsubishi

Mitsubishi Motors Corporation is a Japanese multinational automotive manufacturer.

It is part of the Renault–Nissan–Mitsubishi Alliance but has had connections with many other vehicle manufacturers throughout its history—as shareholders, part owners, and suppliers of parts and components.

How popular is Mitsubishi in the United Kingdom?

Mitsubishi celebrated 100 years of automotive manufacturing in 2017 and has created a solid position for itself in the UK market with around 350k vehicles on the roads today.

Making a mark in an SUV orientated market

The selection of Mitsubishi models does feature the Mirage hatchback and the L200 pickup, but the rest of the range is predominantly SUVs. Even the Mirage has strong SUV overtones.

And why not? They’re sturdy, versatile and roomy enough for families of all sizes, and the Outlander PHEV is perfect for company car drivers with its low fuel bills and plenty of interior space.

Outlander PHEV: The world’s first plug-in hybrid SUV

In 2013 Mitsubishi introduced the world’s first plug-in hybrid SUV. As a company that continues to make significant breakthroughs in driving technology, their work with renewable fuel types is establishing them as a leader in ecological systems.

The Mitsubishi Shogun: the beginnings of the SUV generation

The roots of the Shogun can be traced as far back as 1934 with a prototype for the Japanese Government, but it wasn’t until the Tokyo Motor Show in 1973 that Mitsubishi presented their first commercial prototype.

The Shogun was launched in 1982, and along with other 4x4 originals: predominantly by Land Rover, Jeep and the Toyota Land Cruiser, it helped boost the popularity of rugged go-anywhere motoring into the mainstream.

How common is an EGR valve replacement?

With exhaust gases flowing through the component, it will eventually succumb to the deposits of carbon and hydrocarbons and it will ultimately seize. Replacing an EGR valve is an all too common repair.

How does an EGR valve work and what are the components?

The EGR valve is connected to the exhaust system by a metal tube. When the engine is running, the valve will be opened by the engine management system to allow the exhaust gases to travel up the tube from the exhaust system and back through into the inlet manifold, and afterwards back into the engine. The control of this valve is either driven directly by a solenoid on the EGR unit itself or via a hose to a solenoid on the vacuum circuit that is also opened by the engine management system. Some EGR units have a cooler as part of them, that is plumbed into the engine’s cooling system, literally to cool the exhaust gasses before they go back through. By the exhaust gasses going back into the engine, it reduces NOx (Nitrogen Oxide) content. This is because the exhaust gas reduces the actual oxygen proportion and increases the vapour content, which in return reduces the combustion temperature peak. As more NOx is produced as the temperature rises, this method actively reduces the amount created.

What are the symptoms of a malfunctioning EGR Valve motor?

A rough idle when starting your vehicle or during brief stops (i.e. low engine speeds with a warmed-up engine) can be caused when the EGR is constantly open and a continuous flow of exhaust gases goes into the intake manifold. Poor performance can be caused when the valve is open or closed. The incorrect function of the EGR valve can cause the erratic performance of your vehicle.