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Home >> Mazda >> 2004 >> MX-5 Miata Base, Automatic >> Repair and Diagnosis >> Engine Performance >> Fuel Delivery >> Fuel System >> Fuel Injector Inspection >> Fuel Leakage & Volume Test

Fuel Leakage & Volume Test

WARNING:
  • Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Always carry out the following procedure with the engine stopped.
  1. Complete the "BEFORE SERVICE PRECAUTION". See BEFORE SERVICE PRECAUTION .
  2. Disconnect the negative battery cable.
  3. Remove the dynamic chamber. See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [BP] or INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [BP WITH TC] .
  4. Remove the fuel injectors together with the fuel distributor. See FUEL INJECTOR REMOVAL/INSTALLATION .
  5. Fasten the fuel injectors firmly to the fuel distributor with wire and connect the fuel pipe connector.
    Fig 1: Identifying Fuel Injector Assembly
    G00990108Courtesy of MAZDA MOTORS CORP.
  6. Connect the negative battery cable.
    CAUTION:
    • Connecting to the wrong DLC terminals may cause a malfunction. Carefully connect only to the specified terminals.
  7. Connect DLC terminal F/P and body GND using a jumper wire.
    Fig 2: Connecting DLC Terminal F/P & Body GND Using Jumper Wire
    G00990109Courtesy of MAZDA MOTORS CORP.
  8. Turn the ignition switch to the ON position to operate the FP.
  9. Tilt the fuel injectors approx. 60 deg.  and verify that fuel leaking from the fuel injector nozzles is within the specification.
    • If not as specified, replace the fuel injector.
    1. Fuel leakage Less than 1 drop/2 min 
    Fig 3: Tilt The Fuel Injectors Approx. 60 Degrees
    G00990110Courtesy of MAZDA MOTORS CORP.
  10. Turn the ignition switch to the LOCK position.
  11. Connect the SST  as shown in the figure.
    Fig 4: Connect The SST With Injector Unit
    G00990111Courtesy of MAZDA MOTORS CORP.
  12. Turn the ignition switch to the ON position to operate the FP.
  13. Measure the injection volume of each fuel injector using a graduated container.
    • If not as specified, replace the fuel injector.
    1. Injection volume 66-82 ml {66-82 cc, 2.3-2.7 fl oz}/15 s 
  14. Turn the ignition switch to the LOCK position and disconnect the jumper wire.
  15. Install the dynamic chamber. See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [BP] or INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [BP WITH TC] .)
  16. Complete the "AFTER SERVICE PRECAUTION". See AFTER SERVICE PRECAUTION .
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