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HOMESERVICE MANUALSISUZU2006ASCENDER S, 5.3 M, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 223 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 5.3L - INTRODUCTION (2 OF 2))REPAIR INSTRUCTIONSFUEL RAIL ASSEMBLY REPLACEMENTREMOVAL PROCEDURE
2006 Isuzu Ascender S, 5.3 M, 4WD

Removal Procedure

2006 Isuzu Ascender S, 5.3 M, 4WDSECTION Removal Procedure
WARNING: This page is about a different car, the 2007 GMC Envoy, 2007 Chevrolet TrailBlazer, and 2007 Buick Rainier. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: An 8-digit identification number is located on the fuel rail. Refer to this model identification number if servicing or part replacement is required.
  1. Remove the air cleaner outlet duct. Refer to Air Cleaner Resonator Outlet Duct Replacement .
  2. Relieve the fuel system pressure. Refer to Fuel Pressure Relief .
    3. Fig 1: Identifying Positive Crankcase Ventilation (PCV) Foul Air Hose
    GM1485981Courtesy of GENERAL MOTORS CORP.
  3. Remove the positive crankcase ventilation (PCV) foul air hose.
    4. Fig 2: View Of A/C Compressor Pressure Switch Electrical Connector & Retaining Clip
    GM898468Courtesy of GENERAL MOTORS CORP.
  4. Disconnect the air conditioning (A/C) compressor pressure switch electrical connector (2).
  5. Remove the wire harness from the clip (1) on the cylinder head.
    6. Fig 3: View Of MAF/IAT Sensor Electrical Connector
    GM1204792Courtesy of GENERAL MOTORS CORP.
  6. Disconnect the mass air flow (MAF)/intake air temperature (IAT) sensor electrical connector (1).
    7. Fig 4: View Of Generator Electrical Connector
    GM898329Courtesy of GENERAL MOTORS CORP.
  7. Disconnect the generator electrical connector.
    8. Fig 5: Locating Electrical Components At Top Of Engine
    GM898331Courtesy of GENERAL MOTORS CORP.
  8. Disconnect the following electrical connectors on the right hand side of the engine:
    • Coil main electrical harness (1)
    • Electronic throttle control (ETC) (2)
    • Fuel injectors (3)
    9. Fig 6: View Of CPA Retainer & Tab
    GM1209783Courtesy of GENERAL MOTORS CORP.
  9. Perform the following steps in order to disconnect the fuel injector electrical connectors.
    1. Mark the connectors to their corresponding injectors to ensure correct reassembly.
    2. Pull the connector position assurance (CPA) retainer (2) on the connector up 1 click.
    3. Push the tab (1) on the connector in.
    4. Disconnect the fuel injector electrical connector.
    5. Repeat the steps for each injector electrical connector.
  10. Remove the electrical harness from the clips on ignition coil bracket.
    11. Fig 7: Top Of Engine Wiring Harness View
    GM898326Courtesy of GENERAL MOTORS CORP.
  11. Disconnect the following electrical connectors on the left hand side of the engine:
    • The evaporative emission (EVAP) purge solenoid (1)
    • The knock sensor (2)
    • The manifold absolute pressure (MAP) sensor (3)
    • The main coil (5)
    • The fuel injectors (4)
  12. Remove the electrical harness from the clips on ignition coil bracket.
    13. Fig 8: View Of Upper Engine Wire Harness Retainer Nut
    GM899740Courtesy of GENERAL MOTORS CORP.
  13. Remove the upper engine wire harness retainer nut (1).
  14. Reposition the upper engine wire harness aside.
    15. Fig 9: Identifying Fuel Feed Pipe
    GM1485984Courtesy of GENERAL MOTORS CORP.
  15. Disconnect the fuel feed pipe (1) from the fuel rail. Refer to Metal Collar Quick Connect Fitting Service .
  16. Remove the EVAP canister purge solenoid from the fuel rail. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement .
    17. Fig 10: View Of Fuel Rails
    GM1485986Courtesy of GENERAL MOTORS CORP.
  17. Remove the fuel rail bolts (2 and 3).
  18. Loosen but do not remove the fuel rail crossover pipe retainer clip screws.
    19. NOTE:
    • Remove the fuel rail assembly carefully in order to prevent damage to the injector electrical connector terminals and the injector spray tips. Support the fuel rail after the fuel rail is removed in order to avoid damaging the fuel rail components.
    • Cap the fittings and plug the holes when servicing the fuel system in order to prevent dirt and other contaminants from entering open pipes and passages.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.