Basic Ignition System Checks: C(3)I: Spark
WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 1997 Pontiac Grand Prix, 1997 Pontiac Firebird, 1997 Pontiac Bonneville, 1997 Oldsmobile Regency, and 1997 Oldsmobile LSS. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect tachometer wire (if equipped). A shorted tachometer will prevent vehicle from starting. Disconnect Camshaft Position (CMP) sensor. Attempt to start engine. If engine starts, see appropriate CMP sensor DTC in the TESTS W/CODES article. Using Spark Tester (J-26792), check for adequate spark. Check for spark on plug wires No. 1, 3 and 5 (one at a time). Leave matching plug wire connected while checking for spark. When removing spark plug wire from spark plug, twist and pull on boot. DO NOT pull on wire.