Spark Control Computer Spark Test
- Warm engine to normal operating temperature. Disconnect carburetor switch or unground it. Be sure coolant temperature switch/sensor 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.Spark Advance Test Specifications
Computer Part No. Spark Advance (1) 5213437 51-59° 5213438 46-54° 5213480 41-49° 5213481 43-51° 5213482 41-49° 5213483 41-49° 5213486 40-48° 5213542 51-59° 5213544 46-54° 5213546 39-47° 5213546 (2) 27-35° 5213594 33-41° (1) With engine speed at 2000 RPM and 16 in. Hg vacuum applied. (2) High Altitude.