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 Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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