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CYLINDER DEACTIVATION (ACTIVE FUEL MANAGEMENT) SYSTEM DIAGNOSIS 1. Measure the engine oil level. Fill, as required. 2. Using the scan tool, inspect for diagnostic codes within the engine control module (ECM). Refer to Diagnostic System Check - Vehicle . Repair, as required. 3. Verify proper engine oil pressure and operation of the active fuel management oil pressure relief valve. Refer to Oil Pressure Diagnosis and Testing. 4. Verify proper operation of the active fuel management system components. Refer to Cylinder Deactivation (Active Fuel Management) System Compression Test. faulty thermostat may lead to an overtemperature condition which may cause engine 1. Inspect the oil for excessive foaming or an overfill condition. Oil diluted by coolant may not properly lubricate the crankshaft bearings and may lead to component 2. Inspect by performing a cylinder leak-down test. During this test, excessive air bubbles within the cooling system may indicate a faulty gasket or damaged 3. Inspect by performing a cylinder compression test. 2 cylinders side-by-side on the engine block with low compression may indicate a failed cylinder head gasket. Refer Faulty external engine oil cooler Replace the components, as required. Faulty cylinder head gasket Replace the head gasket and components, as Warped cylinder head Machine the cylinder head to proper flatness, Cracked cylinder head Replace the cylinder head and gasket. Cracked cylinder liner or engine block Replace the components, as required. Cylinder head, block, or manifold porosity Replace the components, as required. IMPORTANT: Cylinder Deactivation (Active Fuel Management) System Diagnosis is applicable for RPO LH6/LMG/LY5/LC9/L76.
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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