bad or misreading MAP or MAF sensors, bad ECT sensor, bad TPS sensor, stuck open fuel injector, or problem with fuel system, faulty parameters set in ECU or bad ECU.
mixture is too rich, is this carb. or injection? Have it checked. Some of this discoloration is normal - caused by carbon monoxide.
Yes and no.. How bad do you really want to change it? Most vehicles with this TBI setup are computer controlled. To change the mixture you will need to LIE to the computer. This means altering the info from sensors such as the o2 sensor. You can do nothing with the TBI unit itself to change the mixture.
The most probable cause is combustion of a rich mixture of fuel.
A millionaire is a rich person. A garden should be planted in rich soil.
High CO is a rich air/fuel mixture. Nothing else.
to much fuel. gm jim Fuel to air mixture too rich or choke stuck on.
It is partially clogged, cylinder miss, or the fuel/air mixture is too rich.
None just brush them of and get the mixture right you wont have to replace any thing.
bad or misreading MAP or MAF sensors, bad ECT sensor, bad TPS sensor, stuck open fuel injector, or problem with fuel system, faulty parameters set in ECU or bad ECU.
saDS
What causes rich farmland in Egypt is when the Nile floods leave rich soil for crops.
Usually when a Catalic Converter becomes unusable, it is usually caused by a enriched fuel system. The rich fuel mixture causes the internal catalyst to become they usually generally melted down inside. This excessive heat is built up when the engine is running in a "too rich fuel mixture". After the converter has been replaced, the automobile should be taken to a repair facility, and have them connect their electronic control monitoring equipment to your on board computer, so the reason for the enriched fuel mixture can be determined and repaired.