Updated specs are available.
Ignition timing at normal idle (NB2 and Mazdaspeed)
This spec doesn't apply to the car you selected.
Not yet checked against the factory manual for your car's year. It's verified in the 2003 Mazda MX-5 Miata Workshop Manual (electronic manual capture); 2005 Mazda MX-5 Miata Workshop Manual (electronic manual capture); later manuals may differ.
6–18° BTDC at 750–850 rpm6–18° BTDC at 750–850 rpm
Factory manualTaken from a Mazda factory workshop manual, with page citation.
Procedure
Warm engine to normal operating temperature; fully charged battery. Start with MT in Neutral or AT in P, electrical loads off, and cooling fan stopped. Read engine-speed RPM PID with factory-compatible diagnostic equipment. Measure using timing light on No.1-cylinder ignition lead. This is the normal-mode reading after disconnecting the test-mode jumper/system selector and selecting CANCEL. It is separate from the 9–11° test-mode reading. Engine Technical Data confirms reference idle750–850rpm.
Applies to
- NB 2001–2005 (BP-Z3) — Other years inferred within NB2 non-turbo family from actual 2003/2005 factory evidence.
- NB 2004–2005 (BP-Z3-TURBO) — Actual2005 factory evidence; 2004 inferred within MSM family.
- Verified in: 2003 Mazda MX-5 Miata Workshop Manual (electronic manual capture); 2005 Mazda MX-5 Miata Workshop Manual (electronic manual capture)
Sources (2)
View 2 source citations
- 2003 Mazda MX-5 Miata Workshop Manual (electronic manual capture)Tier 1
Page Engine Tune-Up, Ignition Timing Inspection (PDF p. 568) · Printed value & notes
Page Engine Tune-Up, Ignition Timing Inspection (PDF p. 568)Printed: “Specification BTDC 6°—18°” - 2005 Mazda MX-5 Miata Workshop Manual (electronic manual capture)Tier 1
Page Engine Tune-Up, Ignition Timing Inspection (PDF p. 650) · Printed value & notes
Page Engine Tune-Up, Ignition Timing Inspection (PDF p. 650)Printed: “Specification BTDC 6°—18°”