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ENGINE NOISE ON START-UP, BUT ONLY LASTING A FEW SECONDS Engine Noise on Start-Up, but Only Lasting a Few Seconds UPPER ENGINE NOISE, REGARDLESS OF ENGINE SPEED Upper Engine Noise, Regardless of Engine Speed Worn valves, valve guides and/or valve stem Inspect the spark plugs for oil deposits. Repair or replace as required. Worn Piston Rings Inspect the spark plugs for oil deposits. Inspect the cylinders for a loss of Perform cylinder leak down and Repair or replace as required. Cause Correction Incorrect oil filter without anti-drainback Install the correct oil filter. Incorrect oil viscosity 1. Drain the oil. 2. Install the correct viscosity oil. Worn crankshaft thrust bearing Inspect the thrust bearing and Repair or replace as required. Damaged or faulty oil filter by-pass valve Inspect the oil filter by-pass valve for Repair or replace as required. Cause Correction Low oil pressure Perform an oil pressure test. Refer to Repair or replace as required. Worn or damaged valve rocker arm Inspect the rocker arm for wear or
2006 Hummer H3 2006 ENGINE Engine Mechanical - 3.5L (L52) - H3
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