"Modification" Of Catalytic Converter ??
 

"What if" I found a 2000 JGC for sale, but the Seller told me that he
had "modified" the catalytic converter, by welding in a piece of straight
pipe in its place ?


I am not a mechanic, but I seem to recall that there are one or two oxygen
sensors before and after the catalytic converter that feed information to
the car's computer, adjusting the carb, etc etc. Are there steps that can
be taken to get around this potential problem ?

If this would be a significant problem, should I either avoid buying the
car, or just plan to have a new catalytic converter installed ?


What are the pros and cons ?

Thanks for any tips or advice !!


James

Re: "Modification" Of Catalytic Converter ??
 

If you really want to buy it, tell the seller if he doesn't sell it to you
at your named price, with a new cat installed per factory specs you'll take
the VIN and report it to the DMV and EPA, and he'll be fined through the
nose.

:-)

Seriously, though, if you live in a state that requires smog inspection
that's an automatic fail. And if he did that, you have to wonder what else
this genius has done to it. Did he tell you why he installed a "test pipe?"
If you are going to buy it, you should really have him pay to install the
cat, as it's illegal to operate it without one.

As far as the O2 sensors go, you're right, it senses the exhaust gas mix and
adjusts the fuel delivery parameters (no carb on this one, it's fuel
injected) and the lack of a cat would give false readings and probably screw
up your fuel economy.

"James" <jnipperxxx@nospamfdn.com> wrote in message
news:8JqdnTFSWoiYCaHbnZ2dnUVZ_h-vnZ2d@comcast.com...
>
>
> "What if" I found a 2000 JGC for sale, but the Seller told me that he
> had "modified" the catalytic converter, by welding in a piece of straight
> pipe in its place ?
>
>
> I am not a mechanic, but I seem to recall that there are one or two
> oxygen
> sensors before and after the catalytic converter that feed information to
> the car's computer, adjusting the carb, etc etc. Are there steps that
> can
> be taken to get around this potential problem ?
>
> If this would be a significant problem, should I either avoid buying the
> car, or just plan to have a new catalytic converter installed ?
>
>
> What are the pros and cons ?
>
> Thanks for any tips or advice !!
>
>
> James
>
>

Re: "Modification" Of Catalytic Converter ??
 

If you really want to buy it, tell the seller if he doesn't sell it to you
at your named price, with a new cat installed per factory specs you'll take
the VIN and report it to the DMV and EPA, and he'll be fined through the
nose.

:-)

Seriously, though, if you live in a state that requires smog inspection
that's an automatic fail. And if he did that, you have to wonder what else
this genius has done to it. Did he tell you why he installed a "test pipe?"
If you are going to buy it, you should really have him pay to install the
cat, as it's illegal to operate it without one.

As far as the O2 sensors go, you're right, it senses the exhaust gas mix and
adjusts the fuel delivery parameters (no carb on this one, it's fuel
injected) and the lack of a cat would give false readings and probably screw
up your fuel economy.

"James" <jnipperxxx@nospamfdn.com> wrote in message
news:8JqdnTFSWoiYCaHbnZ2dnUVZ_h-vnZ2d@comcast.com...
>
>
> "What if" I found a 2000 JGC for sale, but the Seller told me that he
> had "modified" the catalytic converter, by welding in a piece of straight
> pipe in its place ?
>
>
> I am not a mechanic, but I seem to recall that there are one or two
> oxygen
> sensors before and after the catalytic converter that feed information to
> the car's computer, adjusting the carb, etc etc. Are there steps that
> can
> be taken to get around this potential problem ?
>
> If this would be a significant problem, should I either avoid buying the
> car, or just plan to have a new catalytic converter installed ?
>
>
> What are the pros and cons ?
>
> Thanks for any tips or advice !!
>
>
> James
>
>

Re: "Modification" Of Catalytic Converter ??
 

If you really want to buy it, tell the seller if he doesn't sell it to you
at your named price, with a new cat installed per factory specs you'll take
the VIN and report it to the DMV and EPA, and he'll be fined through the
nose.

:-)

Seriously, though, if you live in a state that requires smog inspection
that's an automatic fail. And if he did that, you have to wonder what else
this genius has done to it. Did he tell you why he installed a "test pipe?"
If you are going to buy it, you should really have him pay to install the
cat, as it's illegal to operate it without one.

As far as the O2 sensors go, you're right, it senses the exhaust gas mix and
adjusts the fuel delivery parameters (no carb on this one, it's fuel
injected) and the lack of a cat would give false readings and probably screw
up your fuel economy.

"James" <jnipperxxx@nospamfdn.com> wrote in message
news:8JqdnTFSWoiYCaHbnZ2dnUVZ_h-vnZ2d@comcast.com...
>
>
> "What if" I found a 2000 JGC for sale, but the Seller told me that he
> had "modified" the catalytic converter, by welding in a piece of straight
> pipe in its place ?
>
>
> I am not a mechanic, but I seem to recall that there are one or two
> oxygen
> sensors before and after the catalytic converter that feed information to
> the car's computer, adjusting the carb, etc etc. Are there steps that
> can
> be taken to get around this potential problem ?
>
> If this would be a significant problem, should I either avoid buying the
> car, or just plan to have a new catalytic converter installed ?
>
>
> What are the pros and cons ?
>
> Thanks for any tips or advice !!
>
>
> James
>
>

Re: "Modification" Of Catalytic Converter ??
 

If you really want to buy it, tell the seller if he doesn't sell it to you
at your named price, with a new cat installed per factory specs you'll take
the VIN and report it to the DMV and EPA, and he'll be fined through the
nose.

:-)

Seriously, though, if you live in a state that requires smog inspection
that's an automatic fail. And if he did that, you have to wonder what else
this genius has done to it. Did he tell you why he installed a "test pipe?"
If you are going to buy it, you should really have him pay to install the
cat, as it's illegal to operate it without one.

As far as the O2 sensors go, you're right, it senses the exhaust gas mix and
adjusts the fuel delivery parameters (no carb on this one, it's fuel
injected) and the lack of a cat would give false readings and probably screw
up your fuel economy.

"James" <jnipperxxx@nospamfdn.com> wrote in message
news:8JqdnTFSWoiYCaHbnZ2dnUVZ_h-vnZ2d@comcast.com...
>
>
> "What if" I found a 2000 JGC for sale, but the Seller told me that he
> had "modified" the catalytic converter, by welding in a piece of straight
> pipe in its place ?
>
>
> I am not a mechanic, but I seem to recall that there are one or two
> oxygen
> sensors before and after the catalytic converter that feed information to
> the car's computer, adjusting the carb, etc etc. Are there steps that
> can
> be taken to get around this potential problem ?
>
> If this would be a significant problem, should I either avoid buying the
> car, or just plan to have a new catalytic converter installed ?
>
>
> What are the pros and cons ?
>
> Thanks for any tips or advice !!
>
>
> James
>
>

Re: "Modification" Of Catalytic Converter ??
 

The modificatioin is illegal in most states. You could be saddled with a
repair bill of around $500 to correct the illegal conditiion. I would run,
not walk, to the nearest exit.





"James" <jnipperxxx@nospamfdn.com> wrote in message
news:8JqdnTFSWoiYCaHbnZ2dnUVZ_h-vnZ2d@comcast.com...
>
>
> "What if" I found a 2000 JGC for sale, but the Seller told me that he
> had "modified" the catalytic converter, by welding in a piece of straight
> pipe in its place ?
>
>
> I am not a mechanic, but I seem to recall that there are one or two
> oxygen
> sensors before and after the catalytic converter that feed information to
> the car's computer, adjusting the carb, etc etc. Are there steps that
> can
> be taken to get around this potential problem ?
>
> If this would be a significant problem, should I either avoid buying the
> car, or just plan to have a new catalytic converter installed ?
>
>
> What are the pros and cons ?
>
> Thanks for any tips or advice !!
>
>
> James
>
>

Re: "Modification" Of Catalytic Converter ??
 

The modificatioin is illegal in most states. You could be saddled with a
repair bill of around $500 to correct the illegal conditiion. I would run,
not walk, to the nearest exit.





"James" <jnipperxxx@nospamfdn.com> wrote in message
news:8JqdnTFSWoiYCaHbnZ2dnUVZ_h-vnZ2d@comcast.com...
>
>
> "What if" I found a 2000 JGC for sale, but the Seller told me that he
> had "modified" the catalytic converter, by welding in a piece of straight
> pipe in its place ?
>
>
> I am not a mechanic, but I seem to recall that there are one or two
> oxygen
> sensors before and after the catalytic converter that feed information to
> the car's computer, adjusting the carb, etc etc. Are there steps that
> can
> be taken to get around this potential problem ?
>
> If this would be a significant problem, should I either avoid buying the
> car, or just plan to have a new catalytic converter installed ?
>
>
> What are the pros and cons ?
>
> Thanks for any tips or advice !!
>
>
> James
>
>

Re: "Modification" Of Catalytic Converter ??
 

The modificatioin is illegal in most states. You could be saddled with a
repair bill of around $500 to correct the illegal conditiion. I would run,
not walk, to the nearest exit.





"James" <jnipperxxx@nospamfdn.com> wrote in message
news:8JqdnTFSWoiYCaHbnZ2dnUVZ_h-vnZ2d@comcast.com...
>
>
> "What if" I found a 2000 JGC for sale, but the Seller told me that he
> had "modified" the catalytic converter, by welding in a piece of straight
> pipe in its place ?
>
>
> I am not a mechanic, but I seem to recall that there are one or two
> oxygen
> sensors before and after the catalytic converter that feed information to
> the car's computer, adjusting the carb, etc etc. Are there steps that
> can
> be taken to get around this potential problem ?
>
> If this would be a significant problem, should I either avoid buying the
> car, or just plan to have a new catalytic converter installed ?
>
>
> What are the pros and cons ?
>
> Thanks for any tips or advice !!
>
>
> James
>
>

Re: "Modification" Of Catalytic Converter ??
 

The modificatioin is illegal in most states. You could be saddled with a
repair bill of around $500 to correct the illegal conditiion. I would run,
not walk, to the nearest exit.





"James" <jnipperxxx@nospamfdn.com> wrote in message
news:8JqdnTFSWoiYCaHbnZ2dnUVZ_h-vnZ2d@comcast.com...
>
>
> "What if" I found a 2000 JGC for sale, but the Seller told me that he
> had "modified" the catalytic converter, by welding in a piece of straight
> pipe in its place ?
>
>
> I am not a mechanic, but I seem to recall that there are one or two
> oxygen
> sensors before and after the catalytic converter that feed information to
> the car's computer, adjusting the carb, etc etc. Are there steps that
> can
> be taken to get around this potential problem ?
>
> If this would be a significant problem, should I either avoid buying the
> car, or just plan to have a new catalytic converter installed ?
>
>
> What are the pros and cons ?
>
> Thanks for any tips or advice !!
>
>
> James
>
>

Re: "Modification" Of Catalytic Converter ??
 

"James" <jnipperxxx@nospamfdn.com> wrote in message
news:8JqdnTFSWoiYCaHbnZ2dnUVZ_h-vnZ2d@comcast.com...
>
>
> "What if" I found a 2000 JGC for sale, but the Seller told me that he
> had "modified" the catalytic converter, by welding in a piece of straight
> pipe in its place ?
>
>
> I am not a mechanic, but I seem to recall that there are one or two
> oxygen
> sensors before and after the catalytic converter that feed information to
> the car's computer, adjusting the carb, etc etc. Are there steps that
> can
> be taken to get around this potential problem ?
>
> If this would be a significant problem, should I either avoid buying the
> car, or just plan to have a new catalytic converter installed ?
>
>
> What are the pros and cons ?
>
> Thanks for any tips or advice !!
>
>
> James

Call your aftermarket exhaust shops and price a cat installed. Whatever the
price is, negotiate the difference with the seller off of his asking price.
If you think the Jeep is what you want. It needs to be on there so it'll
pass inspection. The O2 sensors are precat, so the engine computer doesn't
really know it's back there. It is there to insure the unwanted pollutive
gases are more completely burned before exiting the exhaust. Most cats made
in the last ten years or so aren't as restrictive as the early ones, but
people still take them out, thinking they are "freeing up more horsepower".

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