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BASE ENGINE MISFIRE WITH ABNORMAL INTERNAL LOWER ENGINE NOISES sprockets Repair or replace damaged components Worn, damaged or improperly installed Inspect the spark plugs. Refer to Spark Verify engine compression. Refer to Inspect the cylinder bores. Inspect the pistons. Inspect the piston pins. Inspect the connecting rods. Repair or replace damaged components Cause Correction Worn, damaged, or improperly installed Inspect the accessory drive system Repair or replace damaged components Worn, damaged, or improperly installed Inspect the accessory drive system Repair or replace damaged components Worn, damaged, improperly installed or Inspect the crankshaft balancer. Repair or replace damaged components Worn, damaged, improperly installed or Inspect the engine flywheel. Repair or replace damaged components Worn, damaged or improperly installed Inspect the spark plugs. Refer to Spark
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
BASE ENGINE MISFIRE WITH ABNORMAL VALVE TRAIN NOISE Pistons must be installed with the mark, or Verify engine compression. Refer to Inspect the cylinder bores. Inspect the pistons. Inspect the piston pins. Inspect the connecting rods. Repair or replace damaged components Worn, damaged or improperly installed Inspect the crankshaft. Inspect the crankshaft thrust bearing. Repair or replace damaged components Cause Correction Worn, damaged or loose rocker arm Inspect the valve rocker arms. Repair or replace damaged components Worn, damaged, loose or bent valve push rod Inspect the valve push rods. Repair or replace damaged components Worn, damaged or stuck valve, carbon on the Inspect the valves. Inspect the valve guides. Repair or replace damaged components Worn, damaged or dirty valve lifter Inspect the valve lifters. Inspect the camshaft. Repair or replace damaged components Worn or damaged camshaft lobe Inspect the camshaft. Inspect the valve lifters. Repair or replace damaged components
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
BASE ENGINE MISFIRE WITH COOLANT CONSUMPTION BASE ENGINE MISFIRE WITH EXCESSIVE OIL CONSUMPTION ENGINE NOISE ON START-UP, BUT ONLY LASTING A FEW SECONDS Worn, damaged or loose timing chain and Inspect the timing chain and sprockets. Repair or replace damaged components Cause Correction Damaged or improperly installed cylinder Inspect the spark plugs. Refer to Spark Verify engine compression. Refer to Inspect the cylinder heads. Inspect the engine block. Repair or replace damaged components Cause Correction Worn or damaged valve Inspect the valves. Inspect the valve guides. Repair or replace damaged components Worn, damaged or improperly installed Inspect the spark plugs. Refer to Spark Verify engine compression. Refer to Inspect the cylinder bores. Inspect the pistons. Inspect the piston pins. Inspect the connecting rods. Repair or replace damaged components
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
UPPER ENGINE NOISE, REGARDLESS OF ENGINE SPEED Cause Correction Incorrect engine oil, viscosity Install the correct engine oil and oil filter. Incorrect oil filter, without anti-drainback Install the correct engine oil and oil filter. Worn, damaged, or improperly installed oil 1. Inspect the oil filter by-pass valve. 2. Repair or replace damaged components as required. High valve lifter leak down rate 1. Inspect the valve lifters. 2. Repair or replace damaged components as required. Worn, damaged, or improperly installed 1. Inspect the crankshaft. 2. Inspect the crankshaft thrust bearing. 3. Repair or replace damaged components as required. Cause Correction Low oil pressure Verify oil pressure. Refer to Oil Repair or replace damaged components Improper lubrication of the valve train Verify oil pressure. Refer to Oil Inspect the valve rocker arms. Inspect the valve push rods. Inspect the valve lifters. Inspect the oil filter bypass valve. Inspect the oil pump and pump screen. Inspect the engine block oil galleries. Repair or replace damaged components
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
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