Action to be taken if leak detected
WARNING: This page is about a different car, the 2003 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.
- The cut-off valve shall remain activated.
- Detach the line from the EVAP canister purge valve at the intake manifold.
- Raise the pressure again, following the instructions in the Kent-Moore manual.
- Use ultrasonic leak detector J41416 to trace the leak. Start with the line that has been disconnected from the intake manifold and then follow the system lines and components. Make a visual check of the system at the same time.NOTE: In order to check for leaks in components on the top of the fuel tank, it may be necessary to lower the tank a bit.NOTE: Leak detection listening equipment is sensitive to ambient noise, such as exhaust outlet, air-driven machines, use of blower nozzles, leaking pressurized air connections, etc.
Airflow from the ventilation equipment in the workshop can also affect the equipment.
All of the items mentioned can cause a similar, but incorrect indication/detection of a leak in the EVAP system.
- Therefore, always adjust the sensitivity of the ultrasonic leak detector, so that the ambient noise, which often causes interference, is filtered out.NOTE: A larger leak, such as a faulty cut-off valve or a loose line, is difficult to detect as it does not give off the "right noise" to be detected by the ultrasonic leak detector.
For this reason, it is essential that you make a thorough visual inspection of the system components, to check for leaks not detected by the equipment.
- Rectify any leaks detected and test the system again.
- Restore the car to its normal condition.