1990 Volvo 760 GLE, AW71FACTORY OEM SERVICE PROCEDURE

Boost Pressure

  1. Connect air pressure gauge in-line between fuel limiter and intake manifold hose. Use a "T" fitting and enough hose so gauge can be carried into passenger compartment.
  2. Ensure engine is at normal operating temperature. On M/T models, drive vehicle in 3rd gear at approximately 1500 RPM. On A/T models, place selector in position "2".
    CAUTION: To prevent damage to brakes, DO NOT  apply brakes for more than 5 seconds.
  3. Press accelerator pedal to floor. On A/T models, DO NOT  engage kickdown. Increase engine speed to 3000 RPM and apply brakes while keeping accelerator pedal down to obtain full load.
  4. Observe boost pressure on gauge. Maximum boost pressure should be 6.5-7.7 psi (.46-.54 kg/cm2 ). If boost pressure is incorrect, adjust boost pressure. Go to next step.
    CAUTION: Ensure wastegate actuator rod does not turn when adjusting link rod. Damage to wastegate actuator can result.
  5. Remove seal and clip from wastegate actuator link rod. Turn actuator link rod to adjust boost pressure. See Fig 1 .
    Fig 1: Adjusting Turbo Boost Pressure
    G121547Courtesy of VOLVO CARS OF NORTH AMERICA.
  6. Turning link rod 1 turn will change boost pressure approximately 0.4 psi (.03 kg/cm2 ). Turning link rod clockwise will increase boost pressure, counterclockwise will decrease boost pressure.
Factory Service Tools

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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.