Upper Engine Noise, Regardless of Engine Speed. GMC Truck Envoy XUV 2005

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2005 🢒 Envoy XUV 🢒 Engine 🢒 Engine Mechanical - 4.2L 🢒 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.

Worn or damaged valve rocker arm

•	Inspect the rocker arm for wear or missing needle bearings

•	Replace the valve rocker arms as required.

Improper lubrication to the valve rocker arms

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

•	The valve rocker arm

•	The valve lash adjusters

•	The oil filter bypass valve

•	The oil transfer tube

•	The oil pump and pump screen

•	The engine block oil galleries

Broken valve spring

Replace the valve spring.

Worn or dirty valve lash adjusters

Replace the valve lash adjusters.

Stretched or broken timing chain and/or damaged sprocket teeth

Replace the timing chain and sprockets.

Worn engine camshaft lobes

•	Inspect the engine camshaft lobes.

•	Replace the camshaft, valve lash adjusters, and rocker arms 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