Diagnostic Aids

WARNING: This page is about a different car, the 2003 Pontiac Grand Prix, 2003 Chevrolet Malibu, and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

To aid in locating intermittent leaks, use the EVAP Pressure/Purge Diagnostic Station (J 41413) to pressurize the EVAP system. Move all EVAP components while testing using the Ultrasonic Leak Detector (J 41416).

To help locate intermittent leaks, use the Evaporative Emissions System Tester (EEST) (J 41413-200), or equivalent, to introduce smoke into the EVAP system. Move all EVAP components while observing smoke using the High Intensity White Light (J 41413-SPT), or equivalent.
To improve the visibility of the smoke exiting the EVAP system, observe the suspected leak area from different angles using the high intensity White light.
For intermittent conditions, go to INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 3.1L CENTURY, GRAND PRIX & MALIBU article.