Spark Timing Control System

On Maxima and 280ZX, disconnect Gray harness connector from distributor. On all others, ensure all vacuum hoses are in good condition and properly connected.

Fig 1: Spark Timing Control System (Pulsar & Sentra)
Place transmission in Neutral or Park. With engine cold, connect timing light. Start engine and note timing.

Fig 2: Spark Timing Control System (200SX) System shown is in warm-up condition.
As needle of temperature gauge reaches middle position, timing should advance from former position. If timing does not perform as described, replace thermal vacuum valve.