There’s a lot of reasons the cat efficiency can be low, in my experience it’s usually excess fuel being dumped out the engine via misfires that the cat can’t handle. Other common one up here in salt belt is the heat shields fall off and under light load in cold weather the efficiency drops too low. This one often happens coasting down hills in -30 c in a vehicle all the cat heat shields have fallen off of.
If you clean the misfires cause up, sometimes the cat will cook itself clean.
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Today's Featured Article - The Tractor Parade: Story of a Case SC - by Bernie DeLon. On a early fall morning back in 1994, I opened the newspaper and happened to spy an article about a local antique tractor club having their annual show that weekend.
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