Q: What Are the Components and Troubleshooting Steps for an Exhaust Gas Recirculation (EGR) System and EGR Valve?
A: The EGA system recirculates exhaust gases to reduce NOx emissions. Symptoms of problems include rough idling, stalling, and poor performance. To check the system, inspect hoses and test the EGA valve. For turbocharged engines, check the EGR valve, solenoid, and backpressure solenoid. If any components are faulty, replace them.