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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1890 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 6.6L (LMM) - TROUBLESHOOTING AND DIAGNOSIS)FUEL INJECTOR BALANCE TEST WITH TECH 2CIRCUIT/SYSTEM TESTING
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2

Circuit/System Testing

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Circuit/System Testing
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.
IMPORTANT:
  • You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
  • A fuel injector leak into the combustion chamber may result in mechanical damage to the cylinder. If any fuel spray comes out of a glow plug hole during the compression test, replace the fuel injector of the affected cylinder.
  • If fuel vapor is emitted during the engine compression test, replace the affected fuel injector and inspect for fuel contamination. refer to Contaminants-in-Fuel Diagnosis .

Perform the engine compression test. Refer to Engine Compression Test .

  • If the compression indicated any of the cylinders had low compression, refer to Symptoms - Engine Mechanical .
    • IMPORTANT:
    • Failure to correctly identify the cylinder positions may result in the replacement of the wrong injector.
    • During replacement of the injectors, inspect the inlet and outlet fittings for corrosion or contamination. Refer to Contaminants-in-Fuel Diagnosis .
  • If the engine did not have low compression on any of the cylinders, replace the fuel injectors on the cylinders that had low cylinder power contribution, high balance rates, or a noise/smoke change during cancellation.
RENDER: 1.0x

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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.