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 - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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