I have a 2002 Corolla with a 1.8Liter 1zzfe engine.
I can hear a loud “rattle” at 1950 rpm from the drive belt area whether I’m driving down the street or if I rev it up while parked in neutral. It’s not a tapping sound, more like a sheet metal rattle but I can’t locate an loose sheet metal.
I thought it might have been the drivebelt tensioner. The plastic bushing on the small bolt cracked to pieces and I simply replaced it with a stack of washers. That’s the bolt at the top of the piston that screws into the valve cover. I replaced the tension but still hear that rattle. I tried to locate it with a stethoscope but no luck
Anyone have any ideas what this could be? Any help would be greatly appreciated.