What are the symptoms of a faulty EGR valve?
2 Answers
egr valve failure symptoms include: 1. The exhaust gas recirculation valve gets stuck in the fully open position and cannot close completely, causing the vehicle to emit black smoke along with symptoms like poor acceleration, unstable idle, increased fuel consumption, and insufficient power; 2. The exhaust gas recirculation valve gets stuck in the closed position and cannot open fully, which affects the vehicle's emissions. The EGR valve, or exhaust gas recirculation valve, is typically located on the right side of the intake manifold, near the throttle body, and is connected to the exhaust manifold via a short metal pipe. Exhaust gas recirculation is a technology (or method) used in small automotive internal combustion engines where a portion of the exhaust gases is recirculated back into the intake side for re-combustion. Its primary purpose is to reduce nitrogen oxide (NOx) emissions in the exhaust gases and improve fuel economy under partial load conditions.
Having run this auto repair shop for so many years, I've seen countless EGR valve failures. The most common symptom is rough idling that shakes like dancing, sometimes causing sudden stalling at red lights that catches drivers completely off guard. The throttle response becomes sluggish - trying to climb a hill can drive you crazy. That yellow check engine light on the dashboard will definitely light up to protest. The most annoying part is the skyrocketing fuel consumption - last month an SUV owner reported burning nearly 2 extra liters per 100km. The exhaust smell becomes particularly pungent too, guaranteed to fail emissions testing. These issues occur because the valve gets stuck and can't seal properly, allowing exhaust gas to constantly leak into the cylinders while blocking fresh air intake. I recommend trying specialized cleaner immediately, and replacing the valve if that doesn't work - otherwise engine damage will cost you way more.
