|
Re: "Modification" Of Catalytic Converter ??
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. > > > > |
Re: "Modification" Of Catalytic Converter ??
Oh yeah, where I live inspection only takes place upon registration of
the vehicle - after that, unless a cop catches you, everything pretty much becomes fair game. The Merg wrote: > 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. >> >> >> >> |
Re: "Modification" Of Catalytic Converter ??
Oh yeah, where I live inspection only takes place upon registration of
the vehicle - after that, unless a cop catches you, everything pretty much becomes fair game. The Merg wrote: > 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. >> >> >> >> |
Re: "Modification" Of Catalytic Converter ??
Oh yeah, where I live inspection only takes place upon registration of
the vehicle - after that, unless a cop catches you, everything pretty much becomes fair game. The Merg wrote: > 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. >> >> >> >> |
Re: "Modification" Of Catalytic Converter ??
Oh yeah, where I live inspection only takes place upon registration of
the vehicle - after that, unless a cop catches you, everything pretty much becomes fair game. The Merg wrote: > 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. >> >> >> >> |
Re: "Modification" Of Catalytic Converter ??
It is strange that he removed the CAT in the first place. I believe he
wrongly assumed he would get more HP. Having said that, the biggest concern I would have is not with the EPA. My biggest concern would be if your state requires an emission test to register the vehicle. If so, your screwed because it will never pass without CAT. If you live in a sate that has no emission tests, then go ahead and buy the Jeep. You have nothing to worry about. "Jeff Strickland" <crwlr@verizon.net> wrote in message news:tj2%h.1328$vX4.1240@trnddc05... > > "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. > > > > |
Re: "Modification" Of Catalytic Converter ??
It is strange that he removed the CAT in the first place. I believe he
wrongly assumed he would get more HP. Having said that, the biggest concern I would have is not with the EPA. My biggest concern would be if your state requires an emission test to register the vehicle. If so, your screwed because it will never pass without CAT. If you live in a sate that has no emission tests, then go ahead and buy the Jeep. You have nothing to worry about. "Jeff Strickland" <crwlr@verizon.net> wrote in message news:tj2%h.1328$vX4.1240@trnddc05... > > "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. > > > > |
Re: "Modification" Of Catalytic Converter ??
It is strange that he removed the CAT in the first place. I believe he
wrongly assumed he would get more HP. Having said that, the biggest concern I would have is not with the EPA. My biggest concern would be if your state requires an emission test to register the vehicle. If so, your screwed because it will never pass without CAT. If you live in a sate that has no emission tests, then go ahead and buy the Jeep. You have nothing to worry about. "Jeff Strickland" <crwlr@verizon.net> wrote in message news:tj2%h.1328$vX4.1240@trnddc05... > > "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. > > > > |
Re: "Modification" Of Catalytic Converter ??
It is strange that he removed the CAT in the first place. I believe he
wrongly assumed he would get more HP. Having said that, the biggest concern I would have is not with the EPA. My biggest concern would be if your state requires an emission test to register the vehicle. If so, your screwed because it will never pass without CAT. If you live in a sate that has no emission tests, then go ahead and buy the Jeep. You have nothing to worry about. "Jeff Strickland" <crwlr@verizon.net> wrote in message news:tj2%h.1328$vX4.1240@trnddc05... > > "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. > > > > |
Re: "Modification" Of Catalytic Converter ??
There is likely to be an 02 sensor after the cat, even my '97 has an 02
sensor mounted into the cat at the tail-end of it. That 02 sensor's job is to check for proper 02 sensor function so I'm surprised there's no Check Engine light. -- Jerry Bransford PP-ASEL N6TAY See the Geezer Jeep at http://members.cox.net/jerrypb/ |
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