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.
Knocking/rattle from front end when driving slow. Ive developed a knocking/rattle noise coming from the front end of the car, its much more noticeable at low speeds (30mph and under), just uneven road makes it rattle it doesnt need to be a big pot-hole. ive checked the front springs, drop links, track rod ends everything seems to be ok.