@Varoonn gud 2 hear bhai... but resolution seems to be same for both of us.You remember even i do also got that kadd kadd sound near engine and we discussed about timing chain but later it got fixed don't know how. But SA told me that may b injector got blocked due to which it didn't spray well. And somehow injector nozzle got cleared up. I hope this blocking issue arose due to bad fuel . So overall injector is the main culprit for this.. Anyways good news is that knocking sound got resolved without touching the main engine.