Start Timer Advance Timing Test

Connect adjustable timing light to engine so total timing advance can be checked at crankshaft. On 1979 models, connect a jumper wire between carburetor switch and a known good ground. Start engine. 2) On 1976-78 models, set parking brake and apply service brakes. Have an assistant start engine, snap open and close throttle, and immediately place transmission in Drive. Look at timing mark on damper immediately after shifting transmission into Drive.
On all models, continue to observe timing for one minute while adjusting timing light to maintain initial timing. Advance should slowly decrease to initial timing in about one minute.

If timing did not increase and/or decrease to initial timing, replace Spark Control Computer. If timing performed satisfactorily, go to SPEED ADVANCE SCHEDULE TEST . Do not remove timing light or jumper wire (if used).

1976 SPARK ADVANCE SCHEDULE SPECIFICATIONS

Test Name

⁽¹⁾ Additional Advance (Degrees BTDC or Inches Hg)

Start Timer Advance (All Models)

5-9

Throttle Advance (Transducer Out 1 Inch)

At 75°

7-12

At 104°

4-7

Transducer Core Moved Rapidly In And Out

7-12 (1 Second)

Vacuum Advance (Operating Vacuum Range)

⁽²⁾ 32-35"

Thermal Ignition Control Advance

⁽³⁾ 18-35"

⁽¹⁾	Additional advance does not include initial ignition timing.

⁽²⁾	After 6 to 9 minutes, 16 in. Hg minimum.

⁽³⁾	Within 2 seconds, 14 in. Hg minimum. With Thermal Ignition Control disconnected on some models after march 1, 1976.