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Home >> Subaru >> 1992 >> SVX >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Air Induction Systems >> Turbocharger Component Testing >> Boost Pressure
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Boost Pressure

  1. Disconnect wastegate duty solenoid connector. Ensure engine is at normal operating temperature. Disconnect rubber hose from pressure switch. Using a "T" fitting, connect an air pressure gauge. Use enough hose so gauge may be moved inside passenger compartment.
  2. Boost pressure should be checked at 4600 RPM with a wide open throttle. Normal pressure is 6.2-7.3 psi (4.3-5.1 kg/cm2 ). Reconnect wastegate duty solenoid.
  3. If boost pressure is too high, check rubber hose connecting intake manifold to wastegate valve. Replace hose if defective. If wastegate valve is not operating and remains closed, replace turbocharger. If boost pressure is too low, replace turbocharger.
NOTE: When testing wastegate valve, DO NOT  apply any more pressure than specified. Excessive pressure will damage wastegate control valve diaphragm.