A couple of weeks after replacing the O2 sensors and an AFR valve on my 1995 LC (FJZ80), I noticed a rattling noise coming from the area near the front of the cat. It sounds like nuts and bolts rattling around in a tin can. The vehicle has 248k miles, and the cat was never replaced. (I attached a recording ). Any idea what this may be?
It only happens at idle when I'm not reving the engine, and pretty much goes away when I step on the gas. I can't see anything banging together or out of place when I look under the truck, so I'm assuming that it's inside the cat or muffler.
It only happens at idle when I'm not reving the engine, and pretty much goes away when I step on the gas. I can't see anything banging together or out of place when I look under the truck, so I'm assuming that it's inside the cat or muffler.