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Home >> Saturn >> 2002 >> SC2 Automatic, MP6 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Testing & Engine Component Testing >> Fuel Systems (Gasoline) >> Fuel Injector Balance Test (SATURN)
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Fuel Injector Balance Test (SATURN)

NOTE: If engine is at operating temperature, allow a 10 minute cool down period.
  1. On the SOHC engine, remove air intake tube.
  2. Before the Fuel Injector Balance Test is started, the electrical connector should be tested using a Noid Light (J34730). Disconnect electrical connectors at fuel injectors. Connect a noid light to the female connector. Crank the engine. If the noid light does not blink, the electrical problem must be corrected before continuing.
    3. CAUTION: Whenever fuel line fittings are loosened or removed, wrap a shop cloth around the fitting and have an approved container available to collect any fuel.
  3. Connect Gauge Bar Set (SA9127E) to fuel test port.
  4. Connect the Electronic Fuel Injection Tester (SA9182E). Connect the plug to a fuel injector. Connect the red clip to the positive battery post. Connect the black clip to a clean ground. Check the power light. If it is not on, check the battery connection again.
  5. Set the switch on the fuel injector tester to the 50 Pulse-10 MS setting.
    6. NOTE: It may be necessary to cycle the key On/Off a minimum of three times (the key must be off thirty seconds) to bleed all air from the system and achieve maximum system pressure.
  6. Cycle the ignition key On/Off several times (do not start engine) and bleed off all air in the system using the pressure gauge shut-off valve.
  7. Turn the ignition to the Off position for ten seconds. After ten seconds, turn ignition key to the On position (do not start engine) and record gauge pressure (1st reading).
  8. Using the injector tester, pulse injector No. 1.
  9. Record pressure at the instant the gauge needle stops moving (2nd reading).
    10. NOTE: The engine must be started after all cylinders have been tested to prevent flooding or internal damage.
  10. Repeat steps  6 through  9 for the remaining injectors.
  11. Add all the 2nd Readings together and divide by 4 (this is the 2nd reading Average).
  12. Subtract Average of 2nd Readings from each 2nd Reading to obtain the Difference.
  13. An injector is faulty if the Difference is greater than plus or minus 1.5 psi.
  14. Check that all fuel injector connectors are connected. Pull back to ensure a positive engagement.
  15. Remove fuel gauge bar adapter from fuel pressure test port and recap it.
  16. Install air intake tube.
  17. Start engine and check for leaks.
FUEL PRESSURE SPECIFICATIONS (SATURN)

Application (1) psi (kg/cm2 )
1.9L 40-55 (2.8-3.9)
2.2L 50-59 (3.5-4.2)
3.0L 39-49 (2.7-3.4)
(1) Specification listed is with ignition on and engine off.
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