Definition of discourse marker noun from the Oxford Advanced Learner's Dictionary
When an engine starts knocking, one of the first things a mechanic will check is the oil pressure. A warning light may come on in the car, and adding sufficient oil will solve the problem. Sometimes, a knocking noise is caused by loose torque converter bolts or a loose flywheel.
There are several reasons that may be causing a strong knocking sound from the driverâs side front wheel and this sound is likely attributed to an issue with the brakes, steering, and suspension. 1  Struts/Strut Mounts - The suspension strut is attached to the vehicle by the strut mount. It reduces the sound and vibrations of the tires and stabilizes the steering system. If the struts/strut mounts have worn out, broken, or damaged a knocking sound may be heard when driving on rough roads or driving over bumps.