Catalytic Converter Down

Catalytic Converter Down

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What are signs that you Catalytic Converter is bad.?

First off, I have a 1991 Chevy S-10 Blazer 4x4 with the 4.3L TBI engine. I installed a flowmaster muffler on it about a year ago.

now, I have a real loss of power, occasionally I will get a sulfer smell from the exhaust. She has lost acceleration and she doesnt seem to want to rev or hold the rev very well. She feels bogged down like I am driving into a large wall of air.

How can I tell if its the Cat, or maybe the Muffler, or maybe something worse.

Classic symptoms of a plugged catalytic converter. You may also have a check engine light, with these codes:

P0160 O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 2)
P0161 O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)
P0162 O2 Sensor Circuit Malfunction (Bank 2 Sensor 3)
P0163 O2 Sensor Circuit Low Voltage (Bank 2 Sensor 3)
P0164 O2 Sensor Circuit High Voltage (Bank 2 Sensor 3)
P0165 O2 Sensor Circuit Slow Response (Bank 2 Sensor 3)
P0166 O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 3)
P0167 O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 3)

or simply:

P1484 Catalytic Converter 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.