Spark Timing Control System

Ignition timing is retarded when the following conditions are present:

1. Temperature inside the passenger compartment is above 50° F.
2. The carburetor throttle valve is opened below 35° (all with Auto. Trans, exc. 610 models), 40° (all with Man. Trans, exc. 610 models) or 45° (all 610 models).
3. On models with Man. Trans, in all gear positions other than fourth.
   Fig 1: EXHAUST EMISSION CONTROL SYSTEM (MANUAL TRANS.)

   Courtesy of NISSAN NORTH AMERICA, INC.
   Fig 2: EXHAUST EMISSION CONTROL SYSTEM (AUTOMATIC TRANS.)

   Courtesy of NISSAN NORTH AMERICA, INC.