Thinking back, I remember working on one that the entire left bank was dead. Cat was cold, exhaust was low volume. Investigation showed that it was not firing the coils or the injectors on that bank. Further investigation revealed a bad PCM. I went to the junkyard to get a usable one for test purposes and verified that the PCM was indeed bad. Unfortunately, in this day and age of high tech with VIN numbers and mileage being recorded in the PCMs, it was necessary to get a replacement PCM. It had to be flashed with the correct VIN and mileage.
You need to verify whether the injectors are being fired and verify that there is spark getting to each cylinder.
If a cat is plugged, the usual way that they get plugged is when they get loose in their internal mountings and eventually get eroded away enough to allow the internal part to turn and block the flow. When a cat plugs otherwise, it happens gradually over time - not all at once like in your case.
Somebody needs to roll up their sleeves and spend some good diagnostic time under the hood before you start replacing expensive parts like catalytic converters. It will be money well spent!
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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