What are the symptoms of an EGR valve failure?

[MiguelLee]

EGR valve failure symptoms include unstable idle, poor acceleration, increased fuel consumption, and insufficient power. Below is relevant information about exhaust gas recirculation: 1. Introduction to EGR: Exhaust Gas Recirculation is a technology (technique or method) where a portion of the exhaust gases from small automotive internal combustion engines is redirected back to the intake side for re-combustion. Its primary purposes are to reduce nitrogen oxides (NOx) in the exhaust emissions and improve fuel economy under partial load conditions. It is commonly referred to by the acronym "EGR" from the initial letters of each English word. 2. Types of EGR systems: Mechanically controlled EGR system, Electronically controlled EGR system, Directly controlled EGR system, Indirectly controlled EGR system, Single-valve controlled EGR system, Multi-valve controlled EGR system, Open-loop controlled EGR system, Closed-loop controlled EGR system.