Diagnostic Aids

WARNING: This page is about a different car, the 2003 GMC Savana and 2003 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.

To help locate intermittent leaks, see INTERMITTENT CONDITIONS under SELF DIAGNOSTIC SYSTEM.
To improve the visibility of the smoke exiting the EVAP system, observe the suspected leak area from different angles with J 41413-SPT.