Showing specs for all NA & NB Miatas

Fuel injector leakage limit (NB2, non-turbo)

Less than 1 drop in 2 minLess than 1 drop in 2 min

Factory manualTaken from a Mazda factory workshop manual, with page citation.
Procedure

Engine stopped. Complete factory fuel-pressure release and test setup (PDF pp. 688, 701–702). Secure injectors to distributor, run pump using only the specified DLC F/P and body-ground connections, and tilt injectors approximately 60 degrees. Replace injector if leakage exceeds specification.

Applies to
  • NB 2001–2005 (BP-Z3) — Other years inferred from 2003 factory evidence.
  • Verified in: 2003 Mazda MX-5 Miata Workshop Manual (electronic manual capture)

Sources (1)

View 1 source citations
  • 2003 Mazda MX-5 Miata Workshop Manual (electronic manual capture)Tier 1
    Page Fuel Injector Inspection — Fuel Leakage and Volume Test (PDF p. 702) · Printed value & notes
    Page Fuel Injector Inspection — Fuel Leakage and Volume Test (PDF p. 702)
    Printed: “Fuel leakage Less than 1 drop/2 min”