What are the symptoms of a faulty diesel EGR valve?
2 Answers
The symptoms of a faulty diesel EGR valve are: 1. Difficulty starting the engine and poor acceleration; 2. Emission standards not being met; 3. Black smoke from the vehicle's exhaust pipe; 4. Unstable idle or stalling at idle; 5. Malfunction indicator light flashing; 6. Engine oil burning. The reasons for a faulty diesel EGR valve are: 1. Quality issues with the exhaust gas recirculation system itself; 2. Improper maintenance; 3. Fuel quality issues; 4. Aging of the EGR valve. The diesel EGR valve is a mechatronic product installed on diesel engines to control the amount of exhaust gas recirculated back to the intake system. It is located on the right side of the intake manifold, near the throttle body.
I've been driving a diesel car for many years, and the symptoms of a faulty EGR valve are quite obvious. The car's power weakens, especially struggling when going uphill, with a delayed response when pressing the accelerator. Fuel consumption soars; a full tank that used to last 500 kilometers now might only cover 400 kilometers. The engine shakes at idle, sometimes stalling for no reason, particularly with slow starts at traffic lights. In terms of emissions, black smoke comes out of the exhaust pipe with a pungent smell, which also affects the pass rate of environmental tests. The fault light stays on constantly, which is annoying. Over time, not repairing it may lead to more severe carbon buildup, shortening the engine's lifespan, so it's advisable to go to a professional repair shop for inspection and replacement as soon as possible.
