Adjust Ignition Timing for Improved Performance
Ignition Timing: Adjustments
IGNITION TIMING PROCEDURE
To obtain optimum engine performance, the distributor must be correctly positioned on the engine to give proper ignition timing.
Test procedures are as follows:
(1) Connect a suitable Power Timing Light to number one cylinder.
Note: Do not puncture cables, boots or nipples with test probes. Always use proper adapters. Puncturing the spark plug cables with a probe will
damage the cables. The probe can separate the conductor and cause high resistance. In addition breaking th. rubber insulation may permit
secondary current to arc to ground.
(2) Connect red lead of the test tachometer unit to the negative primary terminal of the coil and the black lead to a good ground.
(3) Turn selector switch to the appropriate cylinder position.
(4) Start engine and run until operating temperature is obtained.
(5) With engine at normal operating temperature (off fast idle), momentarily open the throttle and release to make sure there is no bind in the linkage
and that idle speed screw is against its stop.
(6) (Only vehicles equipped with a carburetor switch), connect a jumper wire between the carburetor switch and ground. Disconnect and plug the
vacuum line at the Spark Control Computer.
