Upper Engine Noise, Regardless of Engine Speed

WARNING: This page is about a different variant/trim than selected.

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 hydraulic valve lash adjuster arm 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: Hydraulic Valve Lash Adjuster Arm Hydraulic Valve Lash Adjuster 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 timing chain	Replace the timing chain.
Worn, damaged or faulty timing chain tensioners	Replace the timing chain tensioner.
Worn engine camshaft lobes	Inspect the engine camshaft lobes. Replace the camshaft and hydraulic valve lash adjuster 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