Occasionally whenever my engine is under load or I'm driving uphill I hear a really faint rattling sound. It sounds like a loose bolt or something. I recently replaced my heat shield so I don't think it's that, and I'm changing my spark plugs today to see if that'll get rid of it in case it's knock.
I'm not sure why it would be since my old plugs just look typically worn, I use correct fuel, and I've flushed Lucas injector cleaner through my tank twice. Idk lol. Any help would be appreciated.
I also wouldn't put it past being something to do with my exhaust, but it'd have to be closer to the front of the car.
Although, according to my research, if my motor is knocking, knock that is that infrequent and faint is pretty normal for a lot of engines whenever they're under load.