This "knocking" sound probably means the pipe is hitting against something (like a wall). Possibly a clamp that holds tight the pipe is loose and the pressure is moving the pipe against something. It is possible to place a wooden wedge in the problem area so the pipe does not "bang" or "knock", or get a clamp.
Transmission mount
bad coil springs
its amazing
back struts are bad or exhaust is loose
you did not pay bill
It might mean that there is air in the line. Maybe install a water hammer.
If the 1999 Suburban noise is a sort of loud banging noise, the problem could be that the engine have jumped time. Jumping time would cause the noise and jerking in the engine.
It can.
With out hearing it, It is hard to say whats wrong. But the most common noise like that would probley be a ROD knocking. Time for engine overhaul.
The word "banging" can function as both a verb and an onomatopoeia. As a verb, it describes the action of making a loud noise by striking something. As an onomatopoeia, it imitates the sound of something hitting or striking against a surface.
Check your sway bar rubbers in the front, there are 4 of them and they will cause a bumping and banging noise around corners and over bumps.
CV Joints