Upper Engine Noise, Regardless of Engine Speed. Saturn L300/LW300 2005

For 1990-2009 cars only

Makes 🢒 Saturn 🢒 2005 🢒 L300/LW300 🢒 Engine 🢒 Engine Mechanical - 3.0L (L81) 🢒 Upper Engine Noise, Regardless of Engine Speed

Cause

Correction

Low oil pressure

•	Perform an oil pressure test. Refer to Oil Pressure Diagnosis and Testing .

•	Repair or replace as required.

Improper lubrication to the valve lifters

Inspect the following components, and repair or replace as required:

•	The SHLA - valve lifter

•	The oil filter bypass valve

•	The oil pump and pump screen

•	The cylinder head oil galleries

•	The engine block oil galleries

Worn or dirty SHLAs, valve lifters

Replace the SHLAs - valve lifters.

Stretched or broken timing belt and/or damaged sprocket teeth

Replace the timing belt and sprockets.

Worn timing belt tensioner or tensioners

Replace the timing belt tensioner or tensioners as required.

Worn engine camshaft lobes

•	Inspect the engine camshaft lobes.

•	Replace the camshaft or camshafts and SHLAs, valve lifters, as required.

Worn valve guides or valve stems

Inspect the following components, and repair as required:

•	The valves

•	The valve guides

Stuck Valves

Carbon on the valve stem or valve seat may cause the valve to stay open

Inspect the following components, and repair as required:

•	The valves

•	The valve guides