LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Chevrolet >> 2004 >> Optra Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 1.8L (L79) - Repair Instructions >> Repair Instructions >> Fuel Injection Fuel Rail Assembly Replacement >> Installation Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Installation Procedure

    Fig 1: View Of Fuel Injector
    GM1256143Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Different injectors are calibrated for different flow rates. When ordering new fuel injectors, be certain to order the identical part number that is inscribed on the old injector.
  1. Lubricate the new fuel injector O-rings with engine oil. Install the new O-rings on the fuel injectors.
  2. Install the fuel injectors into the fuel rail sockets with the fuel injector terminals facing outward.
  3. Install the fuel injector retaining clips onto the fuel injector and the fuel rail ledge.
  4. Make sure that the clips are parallel to the fuel injector harness connector.
    5. Fig 2: View Of Fuel Rail And Injectors
    GM1289509Courtesy of GENERAL MOTORS CORP.
  5. Install the fuel rail assembly into the cylinder head.
    6. NOTE: Refer to Fastener Notice .
  6. Install the fuel rail retaining bolts.

    Tighten:  Tighten the fuel rail retaining bolts to 25 N.m (18 lb ft)  .

  7. Connect the fuel feed line to the fuel rail.
  8. Connect the fuel injector connectors. Rotate each fuel injector as required.
    9. Fig 3: Identifying Sensors, Connectors And Covers
    GM1289506Courtesy of GENERAL MOTORS CORP.
  9. Connect the PCV hose to the valve cover.
  10. Connect the breather hose to the valve cover.
  11. Connect the IAT sensor connector.
  12. Connect the negative battery cable.
  13. Perform a leak check of the fuel rail and fuel injectors.
scientia non olet · About LEMON Manuals