Ignition Timing

With engine at normal operating temperature, disconnect hoses at distributor advance unit. Stop engine and connect timing light to No. 1 cylinder and tachometer to connection stud near ignition control unit in engine compartment.
CAUTION: Ignition must be off when attaching test equipment, as extremely high voltage can cause severe shock when ignition is on.
Start engine and increase speed to 3000 RPM. Timing should be as specified. Adjust if necessary by turning distributor. Return engine to idle and connect vacuum hoses. Timing should now read TDC to 7° BTDC. If not, distributor should be removed and tested.

Ignition Timing Specifications

Application

RPM

Timing

All Models

3000

⁽¹⁾23° BTDC

⁽¹⁾	With distributor vacuum hoses disconnected.

Fig 1: Timing Marks on Crankshaft Pulley

Courtesy of PORSCHE CARS NORTH AMERICA, INC.