Section 4 (Engine Controls - Basic Testing): Summary
WARNING: This page does not describe the selected car, but rather 35 other vehicles, including the 1990 Pontiac Sunbird, 1990 Pontiac Grand Prix, 1990 Pontiac Grand Am, 1990 Pontiac Firebird, and 1990 Pontiac Bonneville. However, it is still accessible from the selected car via links, so may be relevant.
If no problems were found while performing BASIC TESTING , no trouble codes (or only intermittent ones) were found while performing DIAGNOSTIC CIRCUIT CHECK and driveability problems exist, proceed to TESTS W/O CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO-START, etc.) or intermittent diagnosis procedures.