Replaced both O2 sensors and Catalyic Converter-Drives just fine for 5 miles or so,the it sits (overnight this time),then start up in morning,RPM is varying from 1100 down to 900 with surges up to 16,000-when I put it in drive,it goes slow wants to die.
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P0133 is a 'lazy' O2 sensor, bank one, side one-it is on the same side as number one cylinder and is in front (upstream) the catalytic converter. O2 sensors get 'lazy' or switch slowly as they get older die to deposits building on the tips or dirt around the outside of the sensor. On a scanner that does real time monitoring, you should see that it is switching between higher readings (.8-.9 volts) and lower readings (.1-.2 volts)-it is expected to perform these 'switches' at a certain rate and if the ECU (brainbox) determines that it is under-reporting, it sets the code. As a rule of thumb, an upstream O2 sensor should be replaced at 100,000 miles. This will assure better overall performance as the O2 sensors ability to monitor the engine is critical.
Overheat Detected A catalyst overheat condition has been detected by
the catalyst temperature sensor
With the symptoms
you are describing though, 99% sure that will be it.
Many times a "clogged" catalytic converter is actually a broken one. Inside the
unit, there is a honeycomb-like structure that aids the converter
in superheating the exhaust fumes, which cuts down significantly on
emissions. Over time, this honeycomb structure can get brittle and crack
or chunk off inside the unit, which will impede the flow of exhaust.
For this reason, many times a clogged or broken catalytic converter will rattle
or make vibrating noises when the engine is given gas.
I also have 2001 S10, 4.3 V6 Engine code W, 4x4, Automatic, 137,000 miles. About 3 weeks ago, I had intake manifold gasket changed and every since then has been doing the same as yours. I suspected that the yahoo who did the gasket change got the distributor in wrong. I had one other mechanic tell me my engine was shot but the distributor , firing order was all right. Then I had another mechanic tell me that the distributor was in wrong and they fixed it but it didn't run any better. They also said the catalytic converter was plugged causing back pressure in engine. This past weekend I cut the catalytic converters (2 of them) off at the y pipe and now the engine will actually idle but still a little rough (and loud) but now the O2 sensors are not able to do their job. They say catalytic converters are only good for about 10 yrs anyway. To get the one piece replacement cats pipe in you have to drop the tranny crossmember, and to drop that it looks like you have to remove the torsion bars or at least one.
you might need a new catalyic converter if not i would suggest that you get your sensor checked these can be a problem the sensor thinks the wheel is slipping and cuts the torque and power down this could be what is happening also could because of airflow control with the catalyic converter