Ignition Timing

With engine at normal operating temperature, disconnect and plug hoses at distributor advance unit. Stop engine and connect timing light to No. 1 cylinder. Connect tachometer to connection stud above ignition control unit in engine compartment.
CAUTION: Dangerously high voltage exists in ignition system. Ignition must be off when attaching or removing testing equipment, or severe shock may occur.

Start engine and accelerate. Adjust timing as necessary by turning distributor. Return engine to idle, and connect vacuum hoses. Recheck timing. Timing should read TDC to 7° BTDC. If not to specification, distributor should be removed and tested.

Fig 1: Ignition Timing Mark Location

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

IGNITION TIMING (Degrees BTDC@RPM)

Application

Timing

All Models

⁽¹⁾ 23@3000

⁽¹⁾	With distributor vacuum advance hoses disconnected and plugged.