How Do You Troubleshoot A Car Engine EGR System?
You might have noticed lately that your car engine is idling by itself before it gets warm or starts detonating when it gets warm. The engine is experiencing the symptoms of a bad Exhaust Gas Recirculation or EGR system. It is this system’s job to recirculate certain amount of exhaust gases back into the intake manifold, at the appropriate time, to reduce nitrogen oxide emissions (NOx). If you are suspecting trouble with the EGR system in your car and have discarded other possibilities let’s test the EGR system in your vehicle. You do not need special knowledge to run these tests. Open the hood of your vehicle and locate the EGR valve. Trace every vacuum hose connected to the EGR valve and EGR system component. Make sure the hoses are not hardened, loose or broken. Damaged hoses leak vacuum or pressure and cause the EGR to fail. Use your fingers. If the openings on the valve allow it-to push the stem up or down against the spring pressure to make sure it is not stuck. If the stem does
