Re: obd ii code.....'97
"bllsht" <nospam@invaliddot.net> wrote in message news:b1pdm1l9sifn7nlbjhcj0ae0e7rbumt310@4ax.com... > In message <7JadnXn_ufJbDfveRVn-jg@ez2.net>, "Jeff Strickland" wrote: > >>I'd replace the O2 Sensor. It should be the one closest to the motor. If >>you >>have an I6, it will be on the manifold. A V8 will have a Bank 1 and a Bank >>2, the I6 only has Bank 1. > > A 97 V8 will have 1 upstream and 1 downstream sensor. Just like a 6 cyl > will. > Yes, but Bank 1 is one side of the motor, Bank 2 is the other side. These are both before the CAT, and if there is one after the CAT, then it is not Bank 1 OR Bank 2. >> >>If there was an O2 Sensor after the CAT, then the code would be that the >>CAT >>isn't working right. I forget the specific verbiage, but the CAT has no >>parts that can fail, so a failed CAT is probably caused by a failed >>sensor. >>Having said that, a CAT _can_ fail, but you usually know because the main >>failure mode is that it gets clogged and this affects performance. > > You make this up as you go? Cat converters can and quite often do fail > without > plugging or rattling. If that wasn't the case, there would be no need to > monitor them for efficiency. If you get a fault for a failed cat, chances > are > the cat is hosed. If there's a problem with the downstream sensor, you'll > get a > downstream sensor fault. Not a cat failure fault. > Yes, you're right. CATs do fail. But they have no moving parts, and the most likely failure is the after-CAT sensor. And the sensor is cheaper than the CAT by a wide margin. The Sensor won't always know that it has failed, it'll _think_ that the CAT is gone first. |
Re: obd ii code.....'97
"bllsht" <nospam@invaliddot.net> wrote in message news:b1pdm1l9sifn7nlbjhcj0ae0e7rbumt310@4ax.com... > In message <7JadnXn_ufJbDfveRVn-jg@ez2.net>, "Jeff Strickland" wrote: > >>I'd replace the O2 Sensor. It should be the one closest to the motor. If >>you >>have an I6, it will be on the manifold. A V8 will have a Bank 1 and a Bank >>2, the I6 only has Bank 1. > > A 97 V8 will have 1 upstream and 1 downstream sensor. Just like a 6 cyl > will. > Yes, but Bank 1 is one side of the motor, Bank 2 is the other side. These are both before the CAT, and if there is one after the CAT, then it is not Bank 1 OR Bank 2. >> >>If there was an O2 Sensor after the CAT, then the code would be that the >>CAT >>isn't working right. I forget the specific verbiage, but the CAT has no >>parts that can fail, so a failed CAT is probably caused by a failed >>sensor. >>Having said that, a CAT _can_ fail, but you usually know because the main >>failure mode is that it gets clogged and this affects performance. > > You make this up as you go? Cat converters can and quite often do fail > without > plugging or rattling. If that wasn't the case, there would be no need to > monitor them for efficiency. If you get a fault for a failed cat, chances > are > the cat is hosed. If there's a problem with the downstream sensor, you'll > get a > downstream sensor fault. Not a cat failure fault. > Yes, you're right. CATs do fail. But they have no moving parts, and the most likely failure is the after-CAT sensor. And the sensor is cheaper than the CAT by a wide margin. The Sensor won't always know that it has failed, it'll _think_ that the CAT is gone first. |
Re: obd ii code.....'97
"bllsht" <nospam@invaliddot.net> wrote in message news:b1pdm1l9sifn7nlbjhcj0ae0e7rbumt310@4ax.com... > In message <7JadnXn_ufJbDfveRVn-jg@ez2.net>, "Jeff Strickland" wrote: > >>I'd replace the O2 Sensor. It should be the one closest to the motor. If >>you >>have an I6, it will be on the manifold. A V8 will have a Bank 1 and a Bank >>2, the I6 only has Bank 1. > > A 97 V8 will have 1 upstream and 1 downstream sensor. Just like a 6 cyl > will. > Yes, but Bank 1 is one side of the motor, Bank 2 is the other side. These are both before the CAT, and if there is one after the CAT, then it is not Bank 1 OR Bank 2. >> >>If there was an O2 Sensor after the CAT, then the code would be that the >>CAT >>isn't working right. I forget the specific verbiage, but the CAT has no >>parts that can fail, so a failed CAT is probably caused by a failed >>sensor. >>Having said that, a CAT _can_ fail, but you usually know because the main >>failure mode is that it gets clogged and this affects performance. > > You make this up as you go? Cat converters can and quite often do fail > without > plugging or rattling. If that wasn't the case, there would be no need to > monitor them for efficiency. If you get a fault for a failed cat, chances > are > the cat is hosed. If there's a problem with the downstream sensor, you'll > get a > downstream sensor fault. Not a cat failure fault. > Yes, you're right. CATs do fail. But they have no moving parts, and the most likely failure is the after-CAT sensor. And the sensor is cheaper than the CAT by a wide margin. The Sensor won't always know that it has failed, it'll _think_ that the CAT is gone first. |
Re: obd ii code.....'97
:-)
Jeff Strickland wrote: > > Yes, but Bank 1 is one side of the motor, Bank 2 is the other side. These > are both before the CAT, and if there is one after the CAT, then it is not > Bank 1 OR Bank 2. > > Yes, you're right. CATs do fail. > > But they have no moving parts, and the most likely failure is the after-CAT > sensor. And the sensor is cheaper than the CAT by a wide margin. The Sensor > won't always know that it has failed, it'll _think_ that the CAT is gone > first. |
Re: obd ii code.....'97
:-)
Jeff Strickland wrote: > > Yes, but Bank 1 is one side of the motor, Bank 2 is the other side. These > are both before the CAT, and if there is one after the CAT, then it is not > Bank 1 OR Bank 2. > > Yes, you're right. CATs do fail. > > But they have no moving parts, and the most likely failure is the after-CAT > sensor. And the sensor is cheaper than the CAT by a wide margin. The Sensor > won't always know that it has failed, it'll _think_ that the CAT is gone > first. |
Re: obd ii code.....'97
:-)
Jeff Strickland wrote: > > Yes, but Bank 1 is one side of the motor, Bank 2 is the other side. These > are both before the CAT, and if there is one after the CAT, then it is not > Bank 1 OR Bank 2. > > Yes, you're right. CATs do fail. > > But they have no moving parts, and the most likely failure is the after-CAT > sensor. And the sensor is cheaper than the CAT by a wide margin. The Sensor > won't always know that it has failed, it'll _think_ that the CAT is gone > first. |
Re: obd ii code.....'97
In message <SqmdnQ8cjYTs-_TeRVn-oQ@ez2.net>, "Jeff Strickland" wrote:
> >"bllsht" <nospam@invaliddot.net> wrote in message >news:b1pdm1l9sifn7nlbjhcj0ae0e7rbumt310@4ax.com.. . >> In message <7JadnXn_ufJbDfveRVn-jg@ez2.net>, "Jeff Strickland" wrote: >> >>>I'd replace the O2 Sensor. It should be the one closest to the motor. If >>>you >>>have an I6, it will be on the manifold. A V8 will have a Bank 1 and a Bank >>>2, the I6 only has Bank 1. >> >> A 97 V8 will have 1 upstream and 1 downstream sensor. Just like a 6 cyl >> will. >> > > >Yes, but Bank 1 is one side of the motor, Bank 2 is the other side. These >are both before the CAT, and if there is one after the CAT, then it is not >Bank 1 OR Bank 2. By default, if there's one O2 before the cat, it's the bank 1 upstream. Likewise, the downstream sensor will be bank 1 downstream. That's the way they are referred to by scan tools. > > > >>> >>>If there was an O2 Sensor after the CAT, then the code would be that the >>>CAT >>>isn't working right. I forget the specific verbiage, but the CAT has no >>>parts that can fail, so a failed CAT is probably caused by a failed >>>sensor. >>>Having said that, a CAT _can_ fail, but you usually know because the main >>>failure mode is that it gets clogged and this affects performance. >> >> You make this up as you go? Cat converters can and quite often do fail >> without >> plugging or rattling. If that wasn't the case, there would be no need to >> monitor them for efficiency. If you get a fault for a failed cat, chances >> are >> the cat is hosed. If there's a problem with the downstream sensor, you'll >> get a >> downstream sensor fault. Not a cat failure fault. >> > >Yes, you're right. CATs do fail. > >But they have no moving parts, and the most likely failure is the after-CAT >sensor. And the sensor is cheaper than the CAT by a wide margin. The Sensor >won't always know that it has failed, it'll _think_ that the CAT is gone >first. > If you had a clue as to how the system operates, you'd know the sensor doesn't _think_ anything. It just changes voltage as O2 content changes. Alone, it can't cause a cat efficiency failure. The PCM determines whether the cat is operating properly or not, by looking at upstream vs downstream switch rates. A brand new, perfectly operating downstream O2 sensor would be more likely to trigger a cat fault than an old worn out, slow switching sensor. An old worn out inoperative downstream O2 sensor will trigger a downstream O2 sensor fault. NOT a cat fault. |
Re: obd ii code.....'97
In message <SqmdnQ8cjYTs-_TeRVn-oQ@ez2.net>, "Jeff Strickland" wrote:
> >"bllsht" <nospam@invaliddot.net> wrote in message >news:b1pdm1l9sifn7nlbjhcj0ae0e7rbumt310@4ax.com.. . >> In message <7JadnXn_ufJbDfveRVn-jg@ez2.net>, "Jeff Strickland" wrote: >> >>>I'd replace the O2 Sensor. It should be the one closest to the motor. If >>>you >>>have an I6, it will be on the manifold. A V8 will have a Bank 1 and a Bank >>>2, the I6 only has Bank 1. >> >> A 97 V8 will have 1 upstream and 1 downstream sensor. Just like a 6 cyl >> will. >> > > >Yes, but Bank 1 is one side of the motor, Bank 2 is the other side. These >are both before the CAT, and if there is one after the CAT, then it is not >Bank 1 OR Bank 2. By default, if there's one O2 before the cat, it's the bank 1 upstream. Likewise, the downstream sensor will be bank 1 downstream. That's the way they are referred to by scan tools. > > > >>> >>>If there was an O2 Sensor after the CAT, then the code would be that the >>>CAT >>>isn't working right. I forget the specific verbiage, but the CAT has no >>>parts that can fail, so a failed CAT is probably caused by a failed >>>sensor. >>>Having said that, a CAT _can_ fail, but you usually know because the main >>>failure mode is that it gets clogged and this affects performance. >> >> You make this up as you go? Cat converters can and quite often do fail >> without >> plugging or rattling. If that wasn't the case, there would be no need to >> monitor them for efficiency. If you get a fault for a failed cat, chances >> are >> the cat is hosed. If there's a problem with the downstream sensor, you'll >> get a >> downstream sensor fault. Not a cat failure fault. >> > >Yes, you're right. CATs do fail. > >But they have no moving parts, and the most likely failure is the after-CAT >sensor. And the sensor is cheaper than the CAT by a wide margin. The Sensor >won't always know that it has failed, it'll _think_ that the CAT is gone >first. > If you had a clue as to how the system operates, you'd know the sensor doesn't _think_ anything. It just changes voltage as O2 content changes. Alone, it can't cause a cat efficiency failure. The PCM determines whether the cat is operating properly or not, by looking at upstream vs downstream switch rates. A brand new, perfectly operating downstream O2 sensor would be more likely to trigger a cat fault than an old worn out, slow switching sensor. An old worn out inoperative downstream O2 sensor will trigger a downstream O2 sensor fault. NOT a cat fault. |
Re: obd ii code.....'97
In message <SqmdnQ8cjYTs-_TeRVn-oQ@ez2.net>, "Jeff Strickland" wrote:
> >"bllsht" <nospam@invaliddot.net> wrote in message >news:b1pdm1l9sifn7nlbjhcj0ae0e7rbumt310@4ax.com.. . >> In message <7JadnXn_ufJbDfveRVn-jg@ez2.net>, "Jeff Strickland" wrote: >> >>>I'd replace the O2 Sensor. It should be the one closest to the motor. If >>>you >>>have an I6, it will be on the manifold. A V8 will have a Bank 1 and a Bank >>>2, the I6 only has Bank 1. >> >> A 97 V8 will have 1 upstream and 1 downstream sensor. Just like a 6 cyl >> will. >> > > >Yes, but Bank 1 is one side of the motor, Bank 2 is the other side. These >are both before the CAT, and if there is one after the CAT, then it is not >Bank 1 OR Bank 2. By default, if there's one O2 before the cat, it's the bank 1 upstream. Likewise, the downstream sensor will be bank 1 downstream. That's the way they are referred to by scan tools. > > > >>> >>>If there was an O2 Sensor after the CAT, then the code would be that the >>>CAT >>>isn't working right. I forget the specific verbiage, but the CAT has no >>>parts that can fail, so a failed CAT is probably caused by a failed >>>sensor. >>>Having said that, a CAT _can_ fail, but you usually know because the main >>>failure mode is that it gets clogged and this affects performance. >> >> You make this up as you go? Cat converters can and quite often do fail >> without >> plugging or rattling. If that wasn't the case, there would be no need to >> monitor them for efficiency. If you get a fault for a failed cat, chances >> are >> the cat is hosed. If there's a problem with the downstream sensor, you'll >> get a >> downstream sensor fault. Not a cat failure fault. >> > >Yes, you're right. CATs do fail. > >But they have no moving parts, and the most likely failure is the after-CAT >sensor. And the sensor is cheaper than the CAT by a wide margin. The Sensor >won't always know that it has failed, it'll _think_ that the CAT is gone >first. > If you had a clue as to how the system operates, you'd know the sensor doesn't _think_ anything. It just changes voltage as O2 content changes. Alone, it can't cause a cat efficiency failure. The PCM determines whether the cat is operating properly or not, by looking at upstream vs downstream switch rates. A brand new, perfectly operating downstream O2 sensor would be more likely to trigger a cat fault than an old worn out, slow switching sensor. An old worn out inoperative downstream O2 sensor will trigger a downstream O2 sensor fault. NOT a cat fault. |
Re: obd ii code.....'97
Jeff Strickland wrote:> > > Yes, but Bank 1 is one side of the motor, Bank 2 is the other side. These > are both before the CAT, and if there is one after the CAT, then it is not > Bank 1 OR Bank 2. > Actually, the way GM numbers them, any of the sensors with exhaust from the #1 cyl flowing past it is considered Bank 1. Thus, the one after the cat is called Bank 1 Sensor 2. However, if it's a dual cat setup...then you have 4 sensors, bank 1 sensors 1&2, and bank 2 sensors 1&2. The parts guys just love trying to figure it out, because their book names them altogether differently(something like positions 1, 2 and 3). -- Old Crow '82 FLTC-P "Pearl" '95 Wrangler YJ TOMKAT, SENS, BS#133, MAMBM, SLOB#13, DH#2 |
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