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

WARNING: This page is about a different car, the 2005 GMC Yukon XL, 2005 Chevrolet Suburban, and 2005 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

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 oil level Too high an oil level will cause aeration within the oil	Add or remove oil as required to achieve proper level.
Incorrect oil filter without anti-drainback feature	Install the correct oil filter.
Incorrect oil viscosity	Drain the oil. Install the correct viscosity oil.
High valve lifter leak down rate	Replace the valve lifters as required.
Worn crankshaft thrust bearing	Check the crankshaft endplay. Inspect the thrust bearing and crankshaft. Repair or replace as required.
Damaged or faulty oil filter by-pass valve	Inspect the oil filter by-pass valve for proper operation. Repair or replace as required.