Basic Ignition System Checks: Dis: Spark
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 factory tachometer is connected to ignition coil tachometer terminal, disconnect it before performing tests. When removing spark plug wire from spark plug, twist and pull on boot, NOT on wire.
- Using Spark Tester (ST-125), check for spark at each spark plug wire using spark tester. Leave opposed firing plug connected while checking for spark. Check spark plug wire resistance on suspect wires. Resistance should be no greater than 30,000 ohms.