I think you mean a cv joint,without grease it will cease up and will make a knocking/grinding noise. If not replaced quickly it can less to bigger problems..
CV (Constant-Velocity) joint
It's not really called a CVC, it's called a CV joint. It stands for Constant Velocity. A CV joint is a flexible joint that transmits power from the axle shaft to the wheel and allows the wheel to turn left and right and move up and down. The joint contains ball bearings held in place with a cage. The entire unit is packed with grease and protected by an accordion style rubber boot. Over time the boot deteriorates and cracks. Since the CV joint spins, a cracked boot throws out all the grease, exposing the interior parts to road grit. Once that happens, the joint is pretty much toast. The best way to repair it is to replace the entire axle with a rebuilt unit.
Defective CVC joint.
It can be a defective CVC-joint or other things. Have it inspected by a qualified mechanic and they will find the cause of the popping noise.
It is easier and cheaper to replace the entire axle. About $80.
Possibly worn CVC joint. Have the CVC joints inspected. It might be that your motor mounts are broked and the motor is lifting up and slaming back on the chasey
CVC joint needs replacing. This can be dangerous, have it repaired.
Possibly worn CVC joint, loose wheel bearing or wheel. Have this looked at ASAP.
CVC Capital Partners was created in 1981.
A CVC can refer to a central venous catheter, or a compact video cassette.
The cardiovascular control center (CVC) is located in the Medulla Oblongata.
Tire out of balance, defective tire with broken internal belt, bent wheel, loose lug nuts, defective CVC joint, defective Universal Joint, bent drive shaft, broken engine or transmission mount.