Fuel Injector Test
- Turn ignition off. Unplug each injector connector. Measure resistance across both terminals. The resistance should be 2-4 ohms when measured at 68°F (20°C).
- To check injector spray pattern and volume, relieve fuel system pressure and remove injectors from engine. Disconnect fuel hose from fuel filter outlet. Use Fuel Injection Kit (09268-41080) to tee fuel injector between fuel filter and fuel pressure regulator.
- Place injector into a graduated container. Place vinyl tube on end of injector to prevent fuel from splashing out.
- Hook up Fuel Injector Tester (09842-30070) or trigger box with appropriate resistor to fuel injector. Turn ignition on, with engine off.
- Connect jumper wire to engine check connector terminals "FP" and "+B" to pressurize fuel system. For engine check connector locations, see Fig 1. Connector terminals are marked on inside of check connector cover. Fuel pump check connector is 2-wire connector near airflow meter in left rear corner of engine compartment (White/Black and Green wires).
- Trigger injector for 15 seconds. Measure volume and check spray pattern. Test each injector 2-3 times. Replace injector if volume is not as specified. See FUEL INJECTOR VOLUME SPECIFICATIONS table.FUEL INJECTOR VOLUME SPECIFICATIONS
Model Volume: Cu. In. (cc) 3S-FE 2.7-3.4 (45-55) 3S-GE 4.0-5.0 (66-82) 3S-GTE 6.3-6.7 (104-110) Difference Between Each Injector .3 (5) - Disconnect injector trigger. Fuel leakage from end of injector should be one drop or less in one minute. Replace injector if leakage is more than specified.