Energy Gas Recirculation or EGR valve systems were initially added to vehicles to address the persistence of nitrogen oxide gas emissions. This system basically works by releasing a small amount of exhaust into the intake manifold to help cool the combustion. This cooling effect then minimizes the reaction between nitrogen and oxygen, preventing them from forming harmful nitrogen oxide. If the valve of your vehicle remains open or is stuck shut, you're definitely going to experience a lot of hassles on the road. Prevent this from happening to you by addressing your car's faulty valve right away. To find out how, read this basic guide below.
Signs and Symptoms
Having a continuously open EGR valve in your system is just as bad as one that is completely stuck shut. Find out if your vehicle's valve is faulty by watching out for the following symptoms:
- Rough idling - If you notice that your vehicle is vibrating vigorously at a full stop, you need to check the valve ASAP. Chances are the valve is open and it cannot close. You see, the valve only opens when the temperature in your engine begins to rise. If it remains open even when the car is idling, the engine will become cold and will start to shake.
- Engine pinging - If you hear a knocking sound coming from your engine, chances are the valve is stuck shut. You see, if it's not able to open when the temperature rises, carbon will start to form at the exhaust port and ping or knock when the engine begins to work.
- Ignition problems - A stuck open EGR valve can also cause you to have a hard time when starting your vehicle. This is because the open valve will create a vacuum leak in the intake manifold, which would naturally affect the ignition components.
- Failed emissions test - A faulty valve can also make you fail an emission tests because your car will emit more nitrogen oxide than it normally would.
Removal and Installation
Replacing your vehicle's faulty EGR valve can be complicated, but it's doable with the right tools and a lot of patience.
Step 1: Locate the valve in your vehicle and disconnect its vacuum hose (if it's vacuum-operated) or unplug the electrical connector attached to it (if it's electronic).
Step 2: After that, see if your valve has a retaining nut that connects it to a pipe tube that runs to the exhaust manifold. If it does, loosen the nut using a tube wrench.
Step 3: Next, use a ratchet and socket to loosen the mounting bolts of the valve to be able to remove it completely from the pipe.
Step 4: Before installing the new valve, use a plastic scraper to gently clean the mounting surface. Once it's clean, position the new EGR valve together with its gasket.
Step 5: Bolt the component in place and connect it to the pipe by reattaching the retaining nut. Tighten the mounting bolts and nuts using the proper tools and attach the vacuum hose or electrical connector to the new valve.