Note: Before you begin, see. Chapter 2. When installing the injector, use new O-rings. To check the idle mixture, you will need a tachometer and an exhaust gas analyzer.
Single overhead camshaft models
Removal
1. Disconnect the negative cable from the battery.
2. Unscrew the nut, disconnect the brake booster vacuum hose from the intake manifold.
3. Remove the idle speed control valve together with the hoses, if necessary, follow the instructions Chapter 22.
4. Disconnect the vacuum line from the fuel pressure regulator.
5. Disconnect the wiring harness cover from the fuel injectors and move it to the side; be careful not to deform the wiring. Pull the housing, squeeze the fastening brackets of the wiring connector to release the housing from the injectors.
6. Remove the four bolts from the brackets that secure the fuel rail to the intake manifold, then lift the fuel rail and injectors up enough to allow the injectors to be removed (see illustrations). Be careful not to deform the fuel supply hoses.
7. To remove the injector from the fuel line, remove the metal retaining clip with a screwdriver, then pull the injector out of the fuel line (see illustrations).
Installation
8. Fuel injectors cannot be repaired because spare parts are not available. If faulty, replace the injector.
9. Begin installation by positioning the new seals on both ends of the injector (see illustration). Even if only one injector was removed, install new seals on all four.
10. Perform installation in reverse order, making sure that all hoses, pipes and wires are connected correctly.
11. Finally, where applicable, check and adjust the idle mixture as described in Chapter 20.
Models with two overhead camshafts
Removal
12. Disconnect the negative cable from the battery.
13. Loosen the screw securing the main air duct to the left end of the air flow meter.
14. Using a socket wrench, remove the four bolts securing the heater assembly to the throttle body. Lift the assembly off the throttle body, disconnect the hose from the base of the heater assembly, then remove the assembly.
15. Place a cloth under the fuel supply hose connector on the fuel line.
16. Slowly loosen the fuel supply hose coupling to relieve pressure in the fuel line, then disconnect the hose from the fuel line. Plug the end of the hose to prevent dirt from entering and causing further fuel leakage.
17. Repeat steps 15 and 16 with the remaining coupling connecting the fuel supply hose to the fuel line.
18. Disconnect the two breather hoses from the camshaft cover. Disconnect the larger rod from the throttle body and remove it.
19. Disconnect the vacuum line from the top of the fuel pressure regulator.
20. Disconnect the electrical wiring from the air flow meter. Remove the O-ring.
21. Disconnect the wiring from the throttle position sensor.
22. Pull the end of the throttle cable away from the throttle lever on the throttle body, then unscrew the cable bracket from the intake manifold and move it to the side (see illustration).
23. Disconnect the wiring harness cover from the fuel injectors and move it to the side; be careful not to deform the wiring harness. Pull the wiring harness cover, squeeze the wiring connector retaining clips to release the cover from the injectors.
24. Loosen and remove the two fuel line mounting nuts, remove the fuel line together with the fuel injectors from the intake manifold. Note the position of the ground loops on the fuel line mounting stand (see illustration).
25. To remove the injector from the fuel line, remove the metal retaining clip with a screwdriver, then pull the injector out of the fuel line.
Installation
26. Installation is carried out as described in paragraphs 8-11 inclusive.
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