Bad engine sound and smell help
Hey everyone, yesterday I did a couple checks with engine oil and coolant (topped it up) and ran the car was fine. Then I took out (by unscrewing button) the windscreen wiper water bucket and replaced water in it, kept the sensors attached and put it back in the same place. I also unscrewed parts to check the air filter, checked the compartment and intake hose it goes in for any debris, and put it back together. I’ve done all this stuff before and nothing bad happened but when I started my car the next day the engine was super rattling, the sound was aweful and a bad burning smell. I don’t know if it was way air filter was put back in so I changed orientation, checked all together and seems fine but still same issue. I’m not turning it back on since I don’t want to damage anything. I’m not a mechanic, I wanna learn but don’t know if I can figure this out. I don’t know what could’ve happened during the process or if this is something else?