Engine Noise on Start-Up, but Only Lasting a Few Seconds. Oldsmobile Aurora 2003

For 1990-2009 cars only

Makes 🢒 Oldsmobile 🢒 2003 🢒 Aurora 🢒 Engine 🢒 Engine Controls - 4.0L 🢒 Engine Noise on Start-Up, but Only Lasting a Few Seconds

Cause

Correction

Incorrect oil filter without anti-drainback feature

Install the correct oil filter.

Incorrect oil viscosity

Drain the engine oil and replace with the correct viscosity oil.

High SHLA (valve lifter) leak down rate

Replace the SHLAs (valve lifters) as required.

Worn crankshaft thrust bearing

•	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.