Mazda MX-5 NA silhouetteMX-5 NA

FUEL SYSTEM

F-113prose procedure
Continued from F-112

Injector removal

  1. 1
    Disconnect the negative battery terminal.
    Photo of the engine intake manifold area showing the injector area with vacuum hoses, PCV hose, air valve and injector connectors visible — relevant to removal steps.
    05U0FX-172
  2. 2
    Remove the air valve. (Refer to page F-98.)
  3. 3
    Remove the PCV hose.
  4. 4
    Disconnect the vacuum hose.
  5. 5
    Disconnect the injector connectors.
  6. 6
    Remove the delivery pipe and the pressure regulator.
    Exploded view of the delivery pipe with four injectors below it. Callouts identify the GROMMET (upper sealing ring on each injector) and the INSULATOR (lower seat under each injector).
    05U0FX-173
  7. 7
    Remove the grommets, injectors, and insulators.

Inspection

Fuel leakage test

  1. 1
    Remove the air valve.
  2. 2
    Firmly affix the injectors to the delivery pipe with wire.
    Photo of the delivery pipe with injectors removed from the head, affixed to the delivery pipe with wire and with fuel hoses still connected, prepared for the fuel leakage test.
    05U0FX-174
  3. 3
    Disconnect the injector connectors.
  4. 4
    Remove the delivery pipe and injectors together with the fuel hoses connected.
  5. 5
    Connect diagnosis connector terminals (F/P) and (GND) with a jumper wire.
    Photo of the diagnosis connector with inset showing connector pin layout, terminals labeled GND and F/P for jumper-wire connection during the fuel leakage test.
    05U0FX-175
  6. 6
    Turn the ignition switch ON.
  7. 7
    Tilt the injectors approx. 60 degrees and verify that no fuel leaks from the injector nozzles.
    After 1 minute a drop of fuel from the injector is acceptable.
    Photo of an injector tilted approximately 60 degrees to verify that no fuel leaks from the nozzle during the leakage test. A 60° angle indication is shown at the bottom of the figure.
    05U0FX-176
  8. 8
    If fuel leaks from an injector, replace it.
  9. 9
    Turn the ignition switch OFF and remove the jumper wire.
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See also

F-98IDLE SPEED CONTROL (ISC) SYSTEM

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