1998 Chevrolet Suburban problem
I have replace the Catalytic converter 2 times and o2 senors
1 time and the spire fuel management system for injectors
comments = Dear MW: I keep getting the code P0420 on my vehicle i do
not know what to do now.
MW:
Hello and welcome. Is the exhaust in the truck the system with 2 cat.
Converters just after each manifold, (y- pipe setup) or are there 2 converters,
one further down the exhaust then the other. I will wait for your reply and try
to help, thanks.
Visitor reply:
Yes there are 2 cat. one for each bank and they meet at the muffler
MW:
OK, thanks. That code is very straight forward of bad #1 cat. 2 possibilities.
Either the replacement converters are of poor quality and not cleaning the
exhaust up enough for the computers readings, or something is burning them
up. A constant misfire will burn up a converter, an inaccurate o2 sensor can
also make for a rich condition and cause a converter to go bad after a period
of time. Poor quality fuel, or high alcohol level can damage a cat., as well as
engine burning coolant or oil. Need to have a detailed overall diagnosis of
the engine and control systems. I will run this past the other guys and see if
they have any other ideas.
Visitor reply:
OK thanks for your help. I took the SUV to a high performance mechanic and
he found a defective o2 sensor after the cat and I have now the bula high
performance cats on it.
I have replace the Catalytic converter 2 times and o2 senors
1 time and the spire fuel management system for injectors
comments = Dear MW: I keep getting the code P0420 on my vehicle i do
not know what to do now.
MW:
Hello and welcome. Is the exhaust in the truck the system with 2 cat.
Converters just after each manifold, (y- pipe setup) or are there 2 converters,
one further down the exhaust then the other. I will wait for your reply and try
to help, thanks.
Visitor reply:
Yes there are 2 cat. one for each bank and they meet at the muffler
MW:
OK, thanks. That code is very straight forward of bad #1 cat. 2 possibilities.
Either the replacement converters are of poor quality and not cleaning the
exhaust up enough for the computers readings, or something is burning them
up. A constant misfire will burn up a converter, an inaccurate o2 sensor can
also make for a rich condition and cause a converter to go bad after a period
of time. Poor quality fuel, or high alcohol level can damage a cat., as well as
engine burning coolant or oil. Need to have a detailed overall diagnosis of
the engine and control systems. I will run this past the other guys and see if
they have any other ideas.
Visitor reply:
OK thanks for your help. I took the SUV to a high performance mechanic and
he found a defective o2 sensor after the cat and I have now the bula high
performance cats on it.
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