2005 GMC Jimmy Automatic, StandardFACTORY OEM SERVICE PROCEDURE

Fuel Injector Cleaning Procedure

Tools Required 

  • J 44466-12  CSFI Fuel Metering Body Jumper Block. See Special Tools .
  • J 44466-13  Screws. See Special Tools .
  • J 44466-11 IAFM Fuel Transfer Tube Recycling Block
  • J 41413  EVAP Pressure and Purge Station. See Special Tools .
  • J 44466-10  Regulator and Hose Assembly. See Special Tools .
  • J 39021  Fuel Injector Coil and Balance Tester. See Special Tools .
  • J 39021-210  Injector Tester Adapter Box. See Special Tools .
  • J 39021-301  V6 Fuel Injector Test Adapter. See Special Tools .
  • J 38500-A  Fuel Injector Cleaner. See Special Tools .
    Fig 1: Fuel Pipes & Components
    GM334517Courtesy of GENERAL MOTORS CORP.
  1. Loosen the fuel fill cap to relieve vapor pressure in the fuel tank.
  2. Remove the positive crankcase ventilation (PCV) clean air tube from air inlet duct and set aside.
  3. Remove the resonator and air inlet duct from throttle body.
  4. Remove the brake booster vacuum hose and connector from intake manifold.
  5. Remove the electrical connector from the central sequential fuel injection (CSFI) fuel metering body.
  6. Remove the spark plug wires from 1, 3 and 5 from the distributor cap.
  7. Remove the fuel line bolt (4) at the rear of intake manifold.
    8. Fig 2: View Of Fuel Pipe Nuts & Clamps
    GM648217Courtesy of GENERAL MOTORS CORP.
  8. Relieve the fuel system pressure.
  9. Remove the nuts (1) and clamp (2) from the fuel pipe.
  10. Remove fuel pipes from the metering body.
    11. IMPORTANT: Make sure that the fuel pipe O-rings, washers, and spacers are present and in their proper position.
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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.