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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1660 (Engine Control System & Fuel System - 6.6L (LMM) - Troubleshooting And 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 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Refer to Charge Air Cooler Warning .
  1. Attach the gauge/regulator assembly from the J 46091:  Tester to the quick disconnect fitting on the J-46091-2.
  2. Connect the air supply to the air valve on the gauge/regulator assembly.
  3. Open the air supply valve slowly, increasing the air pressure to a maximum of 206 kPa (30 psi) while listening for abnormal air leaks.
    4. NOTE:
    • 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 gauge valve is turned OFF.
    • If an excessive air leak hissing sound at turbocharger outlet is present, rotate the crankshaft 90 degrees.
  4. Leave the valve ON for the duration of the test.
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