GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2003 🢒 GMC MD Steel Tilt (W Model) 🢒 Engine 🢒 Engine Controls - 5.0L and 5.7L 🢒 Upper Engine Noise, Regardless of Engine Speed

Cause

Correction

Low oil pressure
    • Verify oil pressure. Refer to Oil Pressure Diagnosis and Testing .
    • Repair or replace damaged components as required.

Improper lubrication of the valve train components
    • Verify oil pressure. Refer to Oil Pressure Diagnosis and Testing .
    • Inspect the valve rocker arms.
    • Inspect the valve push rods.
    • Inspect the valve lifters.
    • Inspect the oil filter bypass valve.
    • Inspect the oil pump and pump screen.
    • Inspect the engine block oil galleries.
    • Repair or replace damaged components as required.

Worn, damaged or improperly installed valve rocker arm
    • Inspect the valve rocker arms.
    • Repair or replace damaged components as required.

Worn or damaged valve rotator
    • Inspect the valve rotators.
    • Repair or replace damaged components as required.

Broken valve spring
    • Inspect the valve springs.
    • Repair or replace damaged components as required.

Worn, damaged or stuck valves (carbon on the valve stem or valve seat)
    • Inspect valves.
    • Inspect valve guides.
    • Repair or replace damaged components as required.

Worn or damaged valve guide
    • Inspect valve guides.
    • Inspect valves.
    • Repair or replace damaged components as required.

Worn, damaged or bent valve push rod
    • Inspect the valve rocker arms.
    • Inspect the valve push rods.
    • Inspect the valve lifters.
    • Repair or replace damaged components as required.

Worn, damaged or dirty valve lifter
    • Inspect the valve lifters.
    • Repair or replace damaged components as required.

Worn or damaged camshaft lobes
    • Inspect the engine camshaft lobes.
    • Repair or replace damaged components as required.

Worn, damaged, improperly installed or loose timing chain and sprockets
    • Inspect the timing chain and sprockets.
    • Repair or replace damaged components as required.

Worn, damaged or improperly installed timing chain tensioner (if equipped)
    • Inspect the timing chain tensioner.
    • Repair or replace damaged components as required.