Lower Engine Noise, Regardless Of Engine Speed - Chevrolet 5.7L Corvette 2004 Shop Manual

Broken valve spring
Loose or broken valve lifter guide
Worn or dirty valve lifters
Stretched or broken timing chain
and/or damaged sprocket teeth
Worn engine camshaft lobes
Worn valve guides or valve stems
Stuck valves
Carbon on the valve stem or valve seat
may cause the valve to stay open.

LOWER ENGINE NOISE, REGARDLESS OF ENGINE SPEED

Lower Engine Noise, Regardless of Engine Speed
Cause
Low oil pressure
Worn accessory drive components
Abnormalities, such as severe cracking, bumps or
missing areas in the accessory drive belt and/or
misalignment of system components.
Loose or damaged crankshaft balancer
Detonation or spark knock
Loose torque converter bolts
The valve rocker arm
The valve push rod
The valve lifter
The oil filter bypass valve
The oil pump and pump screen
The engine block oil galleries
Replace the valve spring.
Repair or replace as required.
Replace the valve lifters.
Replace the timing chain and sprockets.
Inspect the engine camshaft lobes.
Replace the camshaft and valve lifters as required.
Inspect the following components, and repair as required:
The valves
The valve guides
Inspect the following components, and repair as required:
The valves
The valve guides
Perform an oil pressure test. Refer to Oil
Pressure Diagnosis and Testing .
Repair or replace damaged components as
required.
Inspect the accessory drive system.
Repair or replace as required.
Inspect the crankshaft balancer.
Repair or replace as required.
Verify the correct operation of the ignition controls
system. Refer to Detonation/Spark Knock in
Engine Controls - 5.7L.
Inspect the torque converter bolts and
Correction