REMOVAL & INSTALLATION
See Figures 1 and 2
- Disconnect the negative battery cable.
- Relieve the fuel system pressure.
- Remove the fuel rail assembly (refer to the procedure outlined later in this section).
- Carefully pull the injectors from the intake manifold.
- Discard the seal rings, cushion rings and O-rings.
- Slide new cushion rings onto the injectors.
- Coat new O-rings with clean engine oil and put them on the injectors.
- Insert the injectors into the fuel rail. Be sure to align the center line on the injector with the mark on the fuel rail.
- Coat new seal rings with clean engine oil and insert them into the intake manifold.
- Install the fuel rail assembly.
The simplest way to test the injectors is to listen to them with the engine running. Use a stethoscope-type tool to touch each injector while the engine is idling. You should hear a distinct clicking as each injector opens and closes.
Additionally, the resistance of the injector can be easily checked. Disconnect the negative battery cable and unplug the electrical connector from the injector to be tested. Use an ohmmeter to check the resistance across the terminals of the injector. Correct resistance is approximately 1.5-2.5 ohms at 68°F (20°C); slight variations are acceptable due to temperature conditions.
Bench testing of the injectors can only be done using expensive special equipment. Generally this equipment can be found at a dealership and sometimes at a well-equipped machine or performance shop. There is no provision for field testing the injectors by the owner/mechanic. DO NOT attempt to test the injector by removing it from the engine and making it spray into a jar.
Never attempt to check a removed injector by hooking it directly to the battery. The injector runs on a lower voltage and the 12 volts from the battery will destroy it internally.