Upper Engine Noise, Regardless of Engine Speed. Chevrolet Cruze (GME) 2010

For 1990-2009 cars

Cause | Correction
--- | ---

Low oil pressure

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

• | Repair or replace as required.

Loose and/or worn valve rocker arm attachments

• | Inspect the valve rocker arm stud, nut, or bolt.

• | Repair or replace as required.

Worn valve rocker arm | Replace the valve rocker arm.

Improper lubrication to the valve rocker arms

Inspect the following components and repair or replace as required:

• | The valve rocker arm

• | The valve lifter

• | The oil filter bypass valve

• | The oil pump and pump screen

• | The engine block oil galleries

Broken valve spring | Replace the valve spring.
Worn or dirty valve lifters | Replace the valve lifters.
Stretched or broken timing chain and/or damaged sprocket teeth | Replace the timing chain and sprockets.
Worn, damaged, or faulty timing chain tensioners | Replace tensioners

Worn engine camshaft lobes

• | Inspect the engine camshaft lobes.

• | Replace the camshaft and 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