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Content .. 1875 1876 1877 1878 ..
BASE ENGINE MISFIRE WITH COOLANT CONSUMPTION BASE ENGINE MISFIRE WITH EXCESSIVE OIL CONSUMPTION ENGINE NOISE ON START-UP, BUT ONLY LASTING A FEW SECONDS Cause Correction Faulty cylinder head gaskets and/or cracking 1. Inspect for spark plugs saturated by coolant. Refer to Spark Plug 2. Perform a cylinder leak down test. Refer to Cylinder Leakage Test. 3. Inspect the cylinder heads and engine block for damage to the coolant 4. Repair or replace, as required. Cause Correction Worn valves, valve guides and/or valve stem 1. Inspect the spark plugs for oil deposits. Refer to Spark Plug Inspection . 2. Repair or replace, as required. Worn piston rings 1. Inspect the spark plugs for oil deposits. Refer to Spark Plug Inspection . 2. Inspect the cylinders for a loss of compression. Refer to Engine 3. Perform cylinder leak down and compression testing to determine the 4. Repair or replace, as required. Cause Correction Incorrect oil filter without anti-drainback Install the correct oil filter.
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
UPPER ENGINE NOISE, REGARDLESS OF ENGINE SPEED Incorrect oil viscosity 1. Drain the oil. 2. Install the correct viscosity oil. High valve lifter leak down rate Replace the lifters, as required. Worn crankshaft thrust bearing 1. Inspect the crankshaft end play. 2. Inspect the thrust bearing and crankshaft. 3. Repair or replace, as required. Damaged or faulty oil filter bypass valve 1. Inspect the oil filter bypass valve for proper operation. 2. Repair or replace, as required. Cause Correction Low oil pressure 1. Perform an oil pressure test. Refer to Oil Pressure Diagnosis and Testing. 2. Repair or replace, as required. Loose and/or worn valve rocker arm 1. Inspect the valve rocker arm, bolt, and pedestal. 2. Repair or replace, as required. Worn or damaged valve rocker arm 1. Inspect the rocker arm for wear or missing needle bearings 2. Replace the valve rocker arms, as required. Bent or damaged push rod Inspect the following components and The valve rocker arm The valve push rod The valve lifter The valve lifter guide The piston
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
contact. If the top of the piston shows valve Improper lubrication to the valve rocker arms Inspect the following components and repair or replace, as required: The valve rocker arm The valve push rod The valve lifter The oil filter bypass valve The oil pump and pump screen Improper operation of the active fuel The engine block oil galleries Broken valve spring Replace the valve spring and spring shim. Worn or dirty valve lifters Replace the valve lifters, as required. Active fuel management valve lifter with a Replace the valve lifters, as required. Improper operation of the active fuel Repair, as required. Refer to Cylinder Improper operation of the camshaft position Repair, as required. Refer to Camshaft Stretched or broken timing chain and/or Replace the timing chain and sprockets. Worn engine camshaft lobes 1. Inspect the engine camshaft lobes. 2. Replace the camshaft and valve lifters, as required. Worn valve guides or valve stems Inspect the following components and repair, The valves The valve guides Stuck valves Inspect the following components and repair,
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
LOWER ENGINE NOISE, REGARDLESS OF ENGINE SPEED Carbon on the valve stem or valve seat may The valves The valve guides Cut or damaged oil pump screen O-ring seal Repair, as required. Refer to Oil Pressure Cause Correction Low oil pressure 1. Perform an oil pressure test. Refer to Oil Pressure Diagnosis and Testing. 2. Repair or replace damaged components, as required. Worn accessory drive components 1. Inspect the accessory drive system. 2. Repair or replace, as required. Loose or damaged crankshaft balancer 1. Inspect the crankshaft balancer. 2. Repair or replace, as required. Detonation or spark knock Verify the correct operation of the ignition Loose torque converter bolts 1. Inspect the torque converter bolts and flex plate. 2. Repair or replace, as required. Loose or damaged flywheel or flex plate Repair or replace the flywheel or flex plate. Oil pump screen loose, damaged, or 1. Inspect the oil pump screen. 2. Repair or replace, as required. Excessive piston-to-cylinder bore clearance 1. Inspect the piston and cylinder bore. 2. Repair, as required. Excessive piston pin-to-bore clearance 1. Inspect the piston, pin, and connecting rod. 2. Replace the piston and pin as an assembly, as required. Excessive connecting rod bearing clearance Inspect the following components and repair,
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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