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Why replace EGR Valves?

Exhaust gas recirculation helps to keep large amounts of unburned fuel from being released into the atmosphere. This unburned fuel is thought to be a huge contributor to greenhouse gas.

If the EGR system is rendered inoperative because it was disconnected or tampered with the cooling effect that is provided by the EGR system will be lost. Without Exhaust Gas Return the engine will often detonate (knock and ping) when accelerating. This can cause engine damage.

Over time, the EGR valve can become dirty and may cease to function properly. In some cases, the EGR valve can even become stuck in an open or closed position. A faulty exhaust gas recirculation EGR valve can affect the speed and performance of a vehicle, and can even cause stalling and idling troubles.


A blocked Toyota Hiace Diesel EGR valve
(Click to enlarge)

When the EGR valve goes bad it must be replaced. Newer vehicles will turn on the Check Engine Light if there is an EGR valve malfunction. Unlike some emissions control devices that can go bad without affecting the drivability of the vehicle, a faulty EGR valve can really affect the engine's performance, or even cause it to stop running altogether.

With vacuum operated EGR valves, the vacuum diaphragm can rupture and cause the valve to fail. Alternately there may be a carbon build-up under the seat causing it to stick open, or the vacuum hoses or sensors that operate them can fail. Electronic valve EGR valves can have electrical failures, or they can seize up and not function correctly.

EGR Valves can be stuck open when they should be closed or they can be closed when they should be open. If it is open at idle it will act like a giant vacuum leak and the engine will not idle, or will run really roughly. If it doesn't open when it is supposed to open you may experience detonation (knocking or pinging) since the combustion chamber temperature will be higher than normal.

Any of these malfunctions can cause an emission failure on your vehicle, so one can see the importance in the proper operation of this emission control device.

The EGR valve is an important component in the exhaust gas recirculation process as it helps to prevent exhaust valves from overheating, which can accelerate their wear and tear. The EGR valve therefore helps maintain the exhaust system at full capacity and increases the longevity of the internal combustion process.



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