Ignition Timing

NOTE: Before adjusting ignition timing, warm engine to normal operating temperature. Turn off all accessories. Place transmission in Neutral (M/T) or Park (A/T). Ensure idle speed is correct. See IDLE SPEED under IDLE SPEED & MIXTURE. If timing is not within specification, loosen distributor or Crank Angle Sensor (CAS) lock bolt. Rotate distributor or CAS until timing marks are aligned. Tighten lock bolt.

Fig 1: Locating Ignition Timing Marks

Courtesy of MAZDA MOTORS CORP.

NOTE: On Miata, use Blue 1-pin connector near airflow meter as a source of battery power for positive lead of tachometer or timing light (battery is in trunk). DO NOT ground this connector, or 20-amp WIPER fuse will blow.

Connect Diagnostic Tester (49 B019 9A0) to diagnostic connector and select SELF-TEST mode (position 1), or connect jumper wire between diagnostic connector terminals TEN and GND. See Fig 2.
Connect timing light. Set timing to specification. See IGNITION TIMING SPECIFICATIONS table. See Fig 1. Disconnect diagnostic tester or jumper wire from diagnostic connector.

Fig 2: Diagnostic Connector Terminal ID (Miata)

Courtesy of MAZDA MOTORS CORP.

IGNITION TIMING SPECIFICATIONS

Application

M/T

⁽¹⁾ A/T

Miata ⁽²⁾

10 @ 850

10 @ 800

⁽¹⁾	Place automatic transmission in Park.

⁽²⁾	Connect jumper wire between terminals TEN and GND of diagnostic connector.