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Home >> Chevrolet >> 2011 >> Impala LS, 3.9 M >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Engine Mechanical - 3.5L - Diagnostic Information And Procedures) >> 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

WARNING: This page is about a different variant/trim than selected.
Cause Correction
IMPORTANT: The camshaft position actuator may make a slight tapping noise upon cold startup. This is due to the viscosity of the oil that has not yet warmed to proper operating temperatures, and should be considered normal for the first 3.5 minutes of cold engine operation.
Incorrect oil filter without anti-drainback feature Install the correct oil filter.
Incorrect oil viscosity
  1. Drain the oil.
  2. Install the correct viscosity oil.
Worn crankshaft thrust bearing
  1. Inspect the thrust bearing and crankshaft.
  2. Repair or replace as required.
High valve lifter leak down rate Replace the lifters as required.
Excessive crank/rod bearing clearances
  1. Inspect the crankshaft and rod bearings.
  2. Repair or replace as required.
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