Fuel Injector: Service and Repair
Injector Replacement1. Relieve fuel pressure.
2. Remove the fuel rail cover (A), then disconnect the connectors from the fuel injectors (B).
3. Disconnect the vacuum hose and fuel return hose from the fuel pressure regulator (C). Place a rag or shop towel over the hoses before disconnecting them.
4. Remove the retainer nuts (D).
5. Disconnect the PCV valve (E).
6. Disconnect the fuel rail.
7. Remove the fuel injectors from the cylinder head (F).
8. Slide new cushion rings (A) onto the fuel injectors (B).
9. Coat new O-rings (C) with clean engine oil, and put them on the fuel injectors
10. Insert the fuel injectors into the fuel rail (D) first.
11. Coat new seal rings (E) with clean engine oil, and press them into the cylinder head.
12. To prevent damage to the O-rings, install the fuel injectors in the fuel rail first, then install them in the cylinder head.
13. Install and tighten the retainer nuts.
14. Connect the fuel hose to the fuel rail with new washers.
15. Connect the vacuum hoses and fuel return hose to the fuel pressure regulator.
16. Connect the PCV valve.
17. Turn the ignition switch ON (II), but do not operate the starter. After the fuel pump runs for approximately two seconds, the fuel pressure in the fuel line rises. Repeat this two or three times, then check whether there is any fuel leakage.