2004 Chevrolet Impala LSFACTORY OEM SERVICE PROCEDURE

Relief Procedure

    CAUTION: Refer to Battery Disconnect Caution in Cautions and Notices.
  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
  2. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical - 3.8L.
  3. Loosen the fuel filler cap to relieve tank vapor pressure.
  4. Connect theJ 34730-1A  to the fuel pressure connection. Wrap a shop towel around the fuel pressure connection while connecting the fuel pressure gage in order to avoid spillage.
  5. Install the bleed hose into an approved container and open the valve to bleed the system pressure. The fuel connections are now safe for servicing.
  6. Drain any fuel remaining in the fuel pressure gage into an approved container.
    7. Fig 1: Connecting J 34730-1A
    GM180378Courtesy of GENERAL MOTORS CORP.
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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.

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