Spark Control Computer Spark Test
- Warm engine to normal operating temperature. Set basic timing. Disconnect carburetor switch or unground it. Ensure coolant temperature sensor is connected and working properly.
- Remove and plug vacuum hose at vacuum transducer. Connect a vacuum pump to the vacuum transducer and apply 16 in. Hg vacuum. Increase engine speed to 2000 RPM. Timing should be within 4° of specifications. See SPARK ADVANCE TEST SPECIFICATIONS table. If computer fails to obtain settings, replace computer.
SPARK ADVANCE TEST SPECIFICATIONS
| Application |
Computer Part No. |
Advance |
| Shelby |
| Fed. |
5226449 |
38° |
| Calif. |
5226645 |
36° |
| All Other Fed. & High Alt. Models |
| Man. Trans. |
5226439 |
40° |
| Auto. Trans. |
5226433 |
40° |
| All Other Calif. Models |
| Man. Trans. |
5226455 |
40° |
| Auto. Trans. |
5226451 |
36° |