Started getting very loud exhaust noise from right side of engine in 93 LC 1-FZ. Came on suddenly. Had rebuilt engine 5,000 miles ago. Haven't removed heat sheild yet ( I'm still recovering from Covid 2019 and haven't gotten my strength and balance back yet) but from under neath the exhaust system looks intact.
exhaust noise
- Thread starter hikermike
- Start date
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I had this same issue after my rebuild, it was the catalytic converter. The noise can be deceiving the way it carries through the exhaust. Just had the cat replaced and the sound is gone.
One of the 2 exhaust donuts located between the head pipe, and the exhaust manifold could be leaking. Those same type of donuts are used on both the inlet, and exhaust side of your cats, so your leak could be there too. One other item to check, and don't laugh, but make sure one of your O2 sensors isn't missing. The O2 sensors are mounted on top of the exhaust pipe, right in front of each of your cats.