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 ignition timing is not within specification, loosen distributor or crankshaft position sensor lock bolt. Rotate distributor or crankshaft position sensor until timing marks are aligned. Tighten lock bolt.

NOTE: Use Blue 1-pin connector located in right front corner of engine compartment 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 data link connector. Set SYSTEM SELECT to position 1 and TEST SWITCH to SELF-TEST, or connect jumper wire between data link connector terminals TEN and GND. See Fig 1 .
Connect timing light to engine. Set timing to specification. See IGNITION TIMING SPECIFICATIONS table.

Fig 1: Identifying Data Link Connector Terminals

Courtesy of MAZDA MOTORS CORP.

Fig 2: Locating Ignition Timing Marks (Typical)

Courtesy of MAZDA MOTORS CORP.

IGNITION TIMING SPECIFICATIONS (Degrees BTDC @ RPM)

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 GRD of data link connector.