Diagnostic Aids

WARNING: This page is about a different car, the 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, 2003 Chevrolet Monte Carlo, and 2003 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.

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 - 3.4L ALERO, GRAND AM, IMPALA & MONTE CARLO article.