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

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Cause	Correction
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.