Today, I’ll be walking you through the process of finding an EVAP leak in a 2008 Chevy Equinox. The customer reported a check engine light and an EVAP code, so I’ll be using a scanner and a smoke leak detector for the diagnostic process.
First, I hooked up my scanner to verify the complaint and found EVAP system large leak detected (PO455), as well as other codes related to a random misfire and mass airflow sensor.
Next, I used the smoke leak detector to identify the source of the EVAP leak. I explained how the EVAP system works and demonstrated how to apply smoke to the purge solenoid to detect any leaks.
After testing the equipment, I proceeded to jack the vehicle up and checked all the EVAP lines leading back to the fuel tank. Using the scanner, I closed the system for testing purposes to ensure accurate results.
Eventually, I found that the smoke was coming from the fuel cap area, indicating a large leak. I replaced the new gas cap with the original one from the customer, which resolved the issue, highlighting the importance of using genuine parts for EVAP system components.
Before concluding, I discovered a puncture in the EVAP charcoal canister, emphasizing the significance of thorough inspection and the impact of using aftermarket parts on vehicle systems.
In summary, this diagnostic process serves as a comprehensive guide for addressing EVAP leaks in various vehicles, emphasizing the necessity of a smoke machine and a reliable scanner for accurate diagnostics and the importance of using genuine parts for effective solutions.
If you found this diagnostic process helpful, give it a thumbs up. Stay tuned for more informative content from Alex Car Doctor. See you in the next video!
What tools are required for diagnosing an evap leak?
The tools required for diagnosing an evap leak include a scanner and a smoke leak detector.
What are the common codes associated with an evap leak?
Common codes associated with an evap leak include P0455 (evap system large leak detected), P0300 (random misfire), and P0101 (mass airflow sensor).
How can the evap system be tested for leaks?
The evap system can be tested for leaks by using a smoke machine to detect the source of the leak. It’s also important to check the evap lines leading back to the fuel tank and ensure that the gas cap is functioning properly.
What should be done if the smoke is found to be coming from the gas cap area?
If the smoke is found to be coming from the gas cap area, it may indicate a faulty gas cap. In such a case, it’s recommended to get a new gas cap from a dealership to properly fix the evap problem.
What other component may contribute to an evap leak?
In some cases, the evap charcoal canister may have a puncture, which can lead to an evap leak. It’s essential to thoroughly inspect this component as well.
What are the key diagnostic tools for identifying an evap leak?
Key diagnostic tools for identifying an evap leak include a good scanner and a smoke machine. The scanner can be used to run onboard evap diagnostics and ensure accurate test results.