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What is the reason for insufficient exhaust gas recirculation flow in the Buick GL8?

1 Answers
StIris
07/30/25 10:44am
This is generally caused by a stuck EGR valve. Try cleaning it first; if that doesn't work, replacement may be necessary. The main function of exhaust gas recirculation is to reduce nitrogen oxides in the exhaust gases and improve fuel economy under partial load conditions. The exhaust gas recirculation (EGR) system comes in various forms and control methods. Based on the actuator's (EGR valve) control mechanism, it can be divided into mechanically controlled EGR systems and electronically controlled EGR systems. According to the control object of the EGR valve, it can be categorized into directly controlled EGR systems and indirectly controlled EGR systems. Below is an introduction to exhaust gas recirculation: 1. Overview of exhaust gas recirculation: Exhaust gas recirculation is a technique (or method) used in small automotive internal combustion engines where a portion of the exhaust gases is recirculated and reintroduced into the intake side for re-combustion. The primary goals are to reduce nitrogen oxides (NOx) in the exhaust gases 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.
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