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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1040 (Engine Controls And Fuel - 6.6L - Troubleshooting & Diagnosis) >> Charge Air Cooler Diagnosis (Full System Air Leak Test) >> Air Pressure Application

Air Pressure Application

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Refer to Charge Air Cooler Caution .
  1. Attach the gage/regulator assembly from the J 46091  to the quick disconnect fitting on the J-46091-2. See Special Tools .
  2. Rotate the crankshaft to bring the engine up to top dead center (TDC).
  3. Connect the air supply to the air valve on the gage/regulator assembly.
  4. Open the air supply valve slowly, increasing the air pressure to a maximum of 206 kPa (30 psi) while listening for air leaks.
    5. IMPORTANT:
    • An air leak hissing sound at the EGR valve vent port is normal.
    • For accurate readings you must allow approximately 30 seconds for the air pressure to stabilize.
    • The engine will not hold pressure if the gage valve is turned OFF.
  5. Leave the valve ON for the duration of the test.
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