1997 Infiniti J30 BaseFACTORY OEM SERVICE PROCEDURE

Fuel Injector

  1. With engine idling, individually disconnect injector harness connectors. Each injector should produce an equal RPM drop.
  2. With engine cranking or while manually rotating crankshaft position sensor (harness connected with ignition on), listen for clicking or feel for vibration, indicating injectors are triggering. If injectors are not triggering, check power and ground circuits and crankshaft position sensor signal to ECM.
  3. Disconnect fuel injector connector. Using ohmmeter, check across injector terminals for 10-14 ohms resistance. If 10-14 ohms is not indicated, replace fuel injector.
  4. Check for injector leaks by removing injector fuel rail. Keep fuel hose and all injectors connected to rail. Turn ignition on. DO NOT start engine. Observe injector tips for leakage. If injectors drip, replace faulty injectors.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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