Spark Control Computer Spark Test
- Warm engine to normal operating temperature. Disconnect carburetor switch or unground it by placing a thin piece of cardboard between curb idle adjusting screw and switch. Be sure coolant temperature sensor/switch is connected and working properly.
- Remove and plug vacuum hose at vacuum transducer. Connect an auxiliary vacuum supply to vacuum transducer and apply 16 in. Hg. Increase engine speed to 2000 RPM and wait 1 minute before checking specifications. Advance specifications are in addition to basic advance. See SPARK ADVANCE TEST SPECIFICATIONS
table.
- If computer fails to obtain settings, replace computer.
1984 SPARK ADVANCE TEST SPECIFICATIONS
| Application |
Computer No. |
Spark Advance |
| 2-Bbl. |
| Federal |
4289340 |
31-39 |
| California |
4289344 |
31-39 |
| 4-Bbl. |
| All Models |
4289348/4289354 |
21-29 |