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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 455 (ENGINE MECHANICAL)REPAIR INSTRUCTIONSOFF-VEHICLE REPAIR INSTRUCTIONSAIR INJECTION CHECK VALVE INSTALLATION
1999 GMC Forward Control 5.7 R, Automatic

Air Injection Check Valve Installation

1999 GMC Forward Control 5.7 R, AutomaticSECTION Air Injection Check Valve Installation
WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install air injection check valve pipe adapters, rear.

    Tighten 

    Tighten the air injection check valve pipe adapters to 30 N.m (22 lb ft).

    Fig 1: Installing Rear Air Injection Check Valve Pipe Adapters
    G01500864Courtesy of GENERAL MOTORS CORP.
  2. Install air injection check valve pipe adapters, front.

    Tighten 

    Tighten the air injection check valve pipe adapters to 30 N.m (22 lb ft).

    Fig 2: Installing Front Air Injection Check Valve Pipe Adapters
    G01500865Courtesy of GENERAL MOTORS CORP.
  3. Install air injection check valve rear bracket and nuts.

    Tighten 

    Tighten the air injection check valve rear bracket nuts to 25 N.m (18 lb ft).

    Fig 3: Installing Air Injection Check Valve Rear Bracket
    G01500866Courtesy of GENERAL MOTORS CORP.
  4. Install air injection check valve front bracket, bolt and nut.

    Tighten 

    Tighten the air injection check valve front bracket bolt and nut to 25 N.m (18 lb ft).

    Fig 4: Installing Air Injection Check Valve Front Bracket
    G01500867Courtesy of GENERAL MOTORS CORP.
  5. Install air injection check valve rear.

    Tighten 

    Tighten the air injection check valve to 20 N.m (15 lb ft).

  6. Install air injection check valve nut, rear.

    Tighten 

    Tighten the air injection check valve nut rear to 10 N.m (89 lb in).

    Fig 5: Installing Rear Air Injection Check Valve
    G01500868Courtesy of GENERAL MOTORS CORP.
  7. Install air injection check valve front.

    Tighten 

    Tighten the air injection check valve front to 20 N.m (15 lb ft).

  8. Install air injection check valve nut front.

    Tighten 

    Tighten the air injection check valve nut to 10 N.m (89 lb in).

    Fig 6: Installing Front Air Injection Check Valve
    G01500869Courtesy of GENERAL MOTORS CORP.
  9. Install air injection solenoid switch and bolt.

    Tighten 

    Tighten the air injection solenoid switch bolt to 10 N.m (89 lb in).

    Fig 7: Installing Air Injection Solenoid Switch
    G01500870Courtesy of GENERAL MOTORS CORP.
  10. Install air injection check valve pipe, clamps, and bolt.

    Tighten 

    Tighten the air injection check valve pipe bolt to 10 N.m (89 lb in).

    Fig 8: Installing Air Injection Check Valve Pipe
    G01500871Courtesy of GENERAL MOTORS CORP.
  11. Install air injection vacuum hose.
    Fig 9: Installing Air Injection Vacuum Hose
    G01500872Courtesy 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.