EGR (Exhaust Gas Recirculation)
EGR (Exhaust Gas Recirculation) is a system found in modern vehicles that helps reduce harmful emissions. It works by redirecting a small portion of exhaust gases back into the engine, which lowers engine temperature and reduces pollutants. Think of it like a recycling system for engine exhaust. When automotive technicians talk about EGR, they're usually referring to maintaining, diagnosing, or replacing parts of this emissions control system. This is an important system that needs regular inspection and maintenance to keep vehicles running cleanly and efficiently.
Examples in Resumes
Diagnosed and repaired EGR system failures on diesel and gasoline engines
Performed preventive maintenance on EGR valves and related components
Led training sessions for junior technicians on EGR system troubleshooting
Typical job title: "Automotive Technicians"
Also try searching for:
Where to Find Automotive Technicians
Professional Organizations
Online Forums
Job Resources
Example Interview Questions
Senior Level Questions
Q: How would you diagnose an intermittent EGR system failure?
Expected Answer: A senior technician should explain the step-by-step diagnostic process, including checking error codes, inspecting the EGR valve for carbon buildup, testing sensors, and verifying proper vacuum operation. They should also mention the importance of road testing to replicate the issue.
Q: What are the most common EGR system problems you've encountered and how did you resolve them?
Expected Answer: Should discuss various issues like clogged EGR valves, failed sensors, vacuum leaks, and explain proper repair procedures, including when to clean versus replace components.
Mid Level Questions
Q: What are the symptoms of a faulty EGR system?
Expected Answer: Should mention rough idling, increased fuel consumption, failed emissions tests, check engine light, and knocking sounds, along with how these symptoms relate to EGR problems.
Q: How do you properly clean an EGR valve?
Expected Answer: Should describe safety precautions, proper cleaning solutions, removal process, cleaning techniques, and testing procedures after reinstallation.
Junior Level Questions
Q: What is the purpose of an EGR system?
Expected Answer: Should explain that it reduces emissions by recirculating exhaust gases back into the engine, lowering combustion temperatures and reducing nitrogen oxide emissions.
Q: What basic tools do you need to service an EGR system?
Expected Answer: Should list basic hand tools, diagnostic scanner, vacuum gauge, and cleaning materials needed for basic EGR maintenance.
Experience Level Indicators
Junior (0-2 years)
- Basic EGR system understanding
- Simple diagnostic scanning
- Basic maintenance and cleaning
- Safety procedures knowledge
Mid (2-5 years)
- Advanced diagnostic procedures
- EGR component replacement
- Emissions testing expertise
- Multiple vehicle brand experience
Senior (5+ years)
- Complex system diagnostics
- Advanced emissions knowledge
- Training and supervision skills
- Multiple system integration expertise
Red Flags to Watch For
- No experience with diagnostic equipment
- Lack of emissions testing knowledge
- Unable to explain basic EGR operation
- No experience with different vehicle types
- Poor understanding of safety procedures
Related Terms
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