Question
What causes EVAP system "purge valve stuck open" faults, and how to fix them?
Answer
Sticking comes from carbon buildup or electrical failures; fixes include cleaning or valve replacement.
Explain
A stuck-open purge valve causes rough idle and increased emissions. CHEPQ tools command the valve to open/close and measure current draw (normal: 0.5-1.0A)—low current indicates electrical failure, while no mechanical movement points to carbon buildup (resolved via ultrasonic cleaning).
Related Diagnostic Guide
To explore this topic in a broader system-level diagnostic context:
Related Guide: OBD-II, DTC & Live Data Analysis
Recommended Diagnostic Solutions
To apply the diagnostic concepts discussed above in real-world scenarios, explore our full range of professional automotive diagnostic tools. These solutions are designed to support battery testing, system diagnostics, and data analysis for modern vehicles and workshop environments.
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