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Home >> Chevrolet >> 2005 >> Chevy Express H1500, Van Passenger >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Engine Mechanical - 4.3L) >> Diagnostic Information and Procedures >> Engine Noise on Start-Up, but Only Lasting a Few Seconds

Engine Noise on Start-Up, but Only Lasting a Few Seconds

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Engine Noise on Start-Up, but Only Lasting a Few Seconds

Cause Correction
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's secondary ignition circuit is grounded out during diagnosis.
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 engine oil, viscosity Install the correct engine oil and oil filter. Refer to Engine Oil and Oil Filter Replacement .
Incorrect oil filter, without anti-drainback feature Install the correct engine oil and oil filter. Refer to Engine Oil and Oil Filter Replacement .
Worn, damaged or improperly installed oil filter by-pass valve
  • Inspect the oil filter by-pass valve.
  • Repair or replace damaged components as required.
High valve lifter leak down rate
  • Inspect the valve lifters.
  • Repair or replace damaged components as required.
Worn, damaged or improperly installed crankshaft thrust bearing
  • Inspect the crankshaft.
  • Inspect the crankshaft thrust bearing.
  • Repair or replace damaged components as required.