Express 2500 V8-6.6L DSL Turbo (2010)
Important:
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The Cylinder Power Balance Test must be performed under the conditions for which the customer concern occurred.
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Do not operate the cruise control during this test. Cruise control may cause a brief surge of engine speed after the completion of the
test.
4. Perform the Cylinder Power Balance Test with a scan tool. During cylinder cancellation a noticeable power difference will feel like a misfiring
cylinder or vibration.
Circuit/System Testing
Important:
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You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
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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.
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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 (See: Computers and Control Systems/Testing and Inspection/Component Tests and General
Diagnostics/Contaminants-in-Fuel Diagnosis).
Perform the engine compression test. Refer to Engine Compression Test (See: Tune-up and Engine Performance Checks/Compression Check/Testing
and Inspection).
If the compression indicated any of the cylinders had low compression, refer to Symptoms - Engine Mechanical (See: Engine, Cooling and
Exhaust/Engine/Testing and Inspection/Symptom Related Diagnostic Procedures/Symptoms - Engine Mechanical).
Important:
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Failure to correctly identify the cylinder positions may result in the replacement of the wrong injector.
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During replacement of the injectors, inspect the inlet and outlet fittings for corrosion or contamination. Refer to Contaminants-in-Fuel
Diagnosis (See: Computers and Control Systems/Testing and Inspection/Component Tests and General Diagnostics/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.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and
Associated Procedures/Verification Tests and Procedures) after completing the diagnostic procedure.
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Fuel Injector Replacement (Left) (See: Service and Repair/Removal and Replacement/Fuel Injector Replacement (Left Side)) Fuel Injector
Replacement (Right) (See: Service and Repair/Removal and Replacement/Fuel Injector Replacement (Right Side))
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Fuel Pressure Regulator Replacement (See: Fuel Pressure Regulator/Service and Repair)
