Cause | Correction | ||||
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Important: A cold piston knock which disappears in 1.5 minutes should be considered acceptable. A cold engine knock usually disappears when the specific cylinder secondary ignition circuit is grounded out during diagnosis. DEFINITION: A light rattle/tapping noise may indicate a valve train, upper engine concern, or a low rumble/knocking may indicate a crankshaft or piston, lower engine concern. | |||||
Incorrect oil filter without anti-drainback feature | Install the correct oil filter. | ||||
Incorrect oil viscosity |
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High valve lifter leak down rate | Replace the lifters as required. | ||||
Worn crankshaft thrust bearing |
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Damaged or faulty oil filter by-pass valve |
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