Spdloader

"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".

Spdloader

Spdloader

"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".

Spdloader

Spdloader

"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".

Spdloader

Jeff Strickland

"Spdloader" <askforit@nospam.triad.rr.com> wrote in message
news:463cac87$0$15138$4c368faf@roadrunner.com...
>
> "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".
>
> Spdloader
>
>

On a 2000 model, the odds are very good that there is an after-CAT O2 Sensor
to detect and report an ineffeciency with the CAT's performance.

I agree with you, the OP needs to get the CAT installed before he makes the
purchase, but I think the CAT should be installed entirely on the seller's
dime. I would not buy a vehicle with the CAT missing because this tells me
that the seller may have cut off other important parts that I'm going to be
wanting.

As a general rule of thumb, there is no benefit to removing the CAT from
modern cars and trucks. There is an arguable benefit to removing them from
older vehicles, but unless the CAT is destroyed internally (clogged), it
will not have an adverse affect on airflow through the exhaust system. The
CAT does more good than harm, so it should remain unaltered.

To be sure, there are people that engage in street racing, or other forms of
racing, and they may benefit by having the CAT altered or removed, but a
Jeep Cherokee is not among the class of vehicles that will be raced in a
fashion that would make it beneficial to alter or remove the CAT. And, the
Cherokee was raced, then it would be a poor candidate to add to my
collection of cars and trucks.

My suggestion stands, run do not walk to the nearest exit and do not look
back.

Jeff Strickland

"Spdloader" <askforit@nospam.triad.rr.com> wrote in message
news:463cac87$0$15138$4c368faf@roadrunner.com...
>
> "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".
>
> Spdloader
>
>

On a 2000 model, the odds are very good that there is an after-CAT O2 Sensor
to detect and report an ineffeciency with the CAT's performance.

I agree with you, the OP needs to get the CAT installed before he makes the
purchase, but I think the CAT should be installed entirely on the seller's
dime. I would not buy a vehicle with the CAT missing because this tells me
that the seller may have cut off other important parts that I'm going to be
wanting.

As a general rule of thumb, there is no benefit to removing the CAT from
modern cars and trucks. There is an arguable benefit to removing them from
older vehicles, but unless the CAT is destroyed internally (clogged), it
will not have an adverse affect on airflow through the exhaust system. The
CAT does more good than harm, so it should remain unaltered.

To be sure, there are people that engage in street racing, or other forms of
racing, and they may benefit by having the CAT altered or removed, but a
Jeep Cherokee is not among the class of vehicles that will be raced in a
fashion that would make it beneficial to alter or remove the CAT. And, the
Cherokee was raced, then it would be a poor candidate to add to my
collection of cars and trucks.

My suggestion stands, run do not walk to the nearest exit and do not look
back.

Jeff Strickland

"Spdloader" <askforit@nospam.triad.rr.com> wrote in message
news:463cac87$0$15138$4c368faf@roadrunner.com...
>
> "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".
>
> Spdloader
>
>

On a 2000 model, the odds are very good that there is an after-CAT O2 Sensor
to detect and report an ineffeciency with the CAT's performance.

I agree with you, the OP needs to get the CAT installed before he makes the
purchase, but I think the CAT should be installed entirely on the seller's
dime. I would not buy a vehicle with the CAT missing because this tells me
that the seller may have cut off other important parts that I'm going to be
wanting.

As a general rule of thumb, there is no benefit to removing the CAT from
modern cars and trucks. There is an arguable benefit to removing them from
older vehicles, but unless the CAT is destroyed internally (clogged), it
will not have an adverse affect on airflow through the exhaust system. The
CAT does more good than harm, so it should remain unaltered.

To be sure, there are people that engage in street racing, or other forms of
racing, and they may benefit by having the CAT altered or removed, but a
Jeep Cherokee is not among the class of vehicles that will be raced in a
fashion that would make it beneficial to alter or remove the CAT. And, the
Cherokee was raced, then it would be a poor candidate to add to my
collection of cars and trucks.

My suggestion stands, run do not walk to the nearest exit and do not look
back.

Jeff Strickland

"Spdloader" <askforit@nospam.triad.rr.com> wrote in message
news:463cac87$0$15138$4c368faf@roadrunner.com...
>
> "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".
>
> Spdloader
>
>

On a 2000 model, the odds are very good that there is an after-CAT O2 Sensor
to detect and report an ineffeciency with the CAT's performance.

I agree with you, the OP needs to get the CAT installed before he makes the
purchase, but I think the CAT should be installed entirely on the seller's
dime. I would not buy a vehicle with the CAT missing because this tells me
that the seller may have cut off other important parts that I'm going to be
wanting.

As a general rule of thumb, there is no benefit to removing the CAT from
modern cars and trucks. There is an arguable benefit to removing them from
older vehicles, but unless the CAT is destroyed internally (clogged), it
will not have an adverse affect on airflow through the exhaust system. The
CAT does more good than harm, so it should remain unaltered.

To be sure, there are people that engage in street racing, or other forms of
racing, and they may benefit by having the CAT altered or removed, but a
Jeep Cherokee is not among the class of vehicles that will be raced in a
fashion that would make it beneficial to alter or remove the CAT. And, the
Cherokee was raced, then it would be a poor candidate to add to my
collection of cars and trucks.

My suggestion stands, run do not walk to the nearest exit and do not look
back.

The Merg

To tell a secret, I replaced my cat with straight pipe when I upgraded
my exhaust - the cat was dead, and I didn't feel like buying a new one.
I wish I had just gotten a new cat, though, aside from the fact that I
feel bad emitting more pollutants than usual, it's incredibly loud.
The cat acts as a resonator before your muffler, which smooths out
engine noise a lot more than one would suspect - you definitely notice
it when it's gone, though.
I love the rumble my 4banger has at idle, but at high speeds, it's
little better than a ricer. I shouldn't say that, it sounds like I have
no muffler at all. One of these days, when I have the time/money/tools
to put a cat in, it'll get put back in.

Jeff Strickland wrote:
>
> "Spdloader" <askforit@nospam.triad.rr.com> wrote in message
> news:463cac87$0$15138$4c368faf@roadrunner.com...
>>
>> "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".
>>
>> Spdloader
>>
>>
>
> On a 2000 model, the odds are very good that there is an after-CAT O2
> Sensor to detect and report an ineffeciency with the CAT's performance.
>
> I agree with you, the OP needs to get the CAT installed before he makes
> the purchase, but I think the CAT should be installed entirely on the
> seller's dime. I would not buy a vehicle with the CAT missing because
> this tells me that the seller may have cut off other important parts
> that I'm going to be wanting.
>
> As a general rule of thumb, there is no benefit to removing the CAT from
> modern cars and trucks. There is an arguable benefit to removing them
> from older vehicles, but unless the CAT is destroyed internally
> (clogged), it will not have an adverse affect on airflow through the
> exhaust system. The CAT does more good than harm, so it should remain
> unaltered.
>
> To be sure, there are people that engage in street racing, or other
> forms of racing, and they may benefit by having the CAT altered or
> removed, but a Jeep Cherokee is not among the class of vehicles that
> will be raced in a fashion that would make it beneficial to alter or
> remove the CAT. And, the Cherokee was raced, then it would be a poor
> candidate to add to my collection of cars and trucks.
>
> My suggestion stands, run do not walk to the nearest exit and do not
> look back.
>
>
>
>

The Merg

To tell a secret, I replaced my cat with straight pipe when I upgraded
my exhaust - the cat was dead, and I didn't feel like buying a new one.
I wish I had just gotten a new cat, though, aside from the fact that I
feel bad emitting more pollutants than usual, it's incredibly loud.
The cat acts as a resonator before your muffler, which smooths out
engine noise a lot more than one would suspect - you definitely notice
it when it's gone, though.
I love the rumble my 4banger has at idle, but at high speeds, it's
little better than a ricer. I shouldn't say that, it sounds like I have
no muffler at all. One of these days, when I have the time/money/tools
to put a cat in, it'll get put back in.

Jeff Strickland wrote:
>
> "Spdloader" <askforit@nospam.triad.rr.com> wrote in message
> news:463cac87$0$15138$4c368faf@roadrunner.com...
>>
>> "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".
>>
>> Spdloader
>>
>>
>
> On a 2000 model, the odds are very good that there is an after-CAT O2
> Sensor to detect and report an ineffeciency with the CAT's performance.
>
> I agree with you, the OP needs to get the CAT installed before he makes
> the purchase, but I think the CAT should be installed entirely on the
> seller's dime. I would not buy a vehicle with the CAT missing because
> this tells me that the seller may have cut off other important parts
> that I'm going to be wanting.
>
> As a general rule of thumb, there is no benefit to removing the CAT from
> modern cars and trucks. There is an arguable benefit to removing them
> from older vehicles, but unless the CAT is destroyed internally
> (clogged), it will not have an adverse affect on airflow through the
> exhaust system. The CAT does more good than harm, so it should remain
> unaltered.
>
> To be sure, there are people that engage in street racing, or other
> forms of racing, and they may benefit by having the CAT altered or
> removed, but a Jeep Cherokee is not among the class of vehicles that
> will be raced in a fashion that would make it beneficial to alter or
> remove the CAT. And, the Cherokee was raced, then it would be a poor
> candidate to add to my collection of cars and trucks.
>
> My suggestion stands, run do not walk to the nearest exit and do not
> look back.
>
>
>
>

The Merg

To tell a secret, I replaced my cat with straight pipe when I upgraded
my exhaust - the cat was dead, and I didn't feel like buying a new one.
I wish I had just gotten a new cat, though, aside from the fact that I
feel bad emitting more pollutants than usual, it's incredibly loud.
The cat acts as a resonator before your muffler, which smooths out
engine noise a lot more than one would suspect - you definitely notice
it when it's gone, though.
I love the rumble my 4banger has at idle, but at high speeds, it's
little better than a ricer. I shouldn't say that, it sounds like I have
no muffler at all. One of these days, when I have the time/money/tools
to put a cat in, it'll get put back in.

Jeff Strickland wrote:
>
> "Spdloader" <askforit@nospam.triad.rr.com> wrote in message
> news:463cac87$0$15138$4c368faf@roadrunner.com...
>>
>> "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".
>>
>> Spdloader
>>
>>
>
> On a 2000 model, the odds are very good that there is an after-CAT O2
> Sensor to detect and report an ineffeciency with the CAT's performance.
>
> I agree with you, the OP needs to get the CAT installed before he makes
> the purchase, but I think the CAT should be installed entirely on the
> seller's dime. I would not buy a vehicle with the CAT missing because
> this tells me that the seller may have cut off other important parts
> that I'm going to be wanting.
>
> As a general rule of thumb, there is no benefit to removing the CAT from
> modern cars and trucks. There is an arguable benefit to removing them
> from older vehicles, but unless the CAT is destroyed internally
> (clogged), it will not have an adverse affect on airflow through the
> exhaust system. The CAT does more good than harm, so it should remain
> unaltered.
>
> To be sure, there are people that engage in street racing, or other
> forms of racing, and they may benefit by having the CAT altered or
> removed, but a Jeep Cherokee is not among the class of vehicles that
> will be raced in a fashion that would make it beneficial to alter or
> remove the CAT. And, the Cherokee was raced, then it would be a poor
> candidate to add to my collection of cars and trucks.
>
> My suggestion stands, run do not walk to the nearest exit and do not
> look back.
>
>
>
>