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O2 sensor
I've seen lots of posts lately concerning the O2 sensor. Is there a way to
check them? I don't have any error codes, but I think that the downstream sensor close to the cat converter is not working. I have a '97 GC. thanks! |
Re: O2 sensor
Why do you think that?
-- Jim 98 TJ SE 90 SJ GW http://www.delawareja.com/gallery/JDJeep98 "Cal" <codom1@triad.rr.com> wrote in message news:CYVeb.17738$xB4.13406@twister.southeast.rr.co m... > I've seen lots of posts lately concerning the O2 sensor. Is there a way to > check them? I don't have any error codes, but I think that the downstream > sensor close to the cat converter is not working. I have a '97 GC. thanks! > > |
Re: O2 sensor
Why do you think that?
-- Jim 98 TJ SE 90 SJ GW http://www.delawareja.com/gallery/JDJeep98 "Cal" <codom1@triad.rr.com> wrote in message news:CYVeb.17738$xB4.13406@twister.southeast.rr.co m... > I've seen lots of posts lately concerning the O2 sensor. Is there a way to > check them? I don't have any error codes, but I think that the downstream > sensor close to the cat converter is not working. I have a '97 GC. thanks! > > |
Re: O2 sensor
Even after a 50 mile or more warm up period, my 'catalyst' monitor is never
ready with a scan tool. I would like to be able to test the O2 sensor downstream from the converter to see if it is bad. I think this may have been a problem for a while. It may be related to a carbon problem I seem to have on occasion. My dealership has had this jeep for up to 2 days (when it starts to misfire) and they have never been able to correct it. A bottle of good fuel injector cleaner always 'fixes' it though. I have had thin, hard carbon deposits on several plugs in the past, and suspect that incorrect data from O2 sensors and rich fuel is probably to blame. I know there have been lots of comments about 'ordinary people' having scan tools on this site, but, apparently, some dealerships don't need them either. "TJim" <jim@ranlet.nospam.com> wrote in message news:MDOdnVZF6I8gseGiU-KYgg@comcast.com... > Why do you think that? > > -- > Jim > 98 TJ SE > 90 SJ GW > http://www.delawareja.com/gallery/JDJeep98 > > > "Cal" <codom1@triad.rr.com> wrote in message > news:CYVeb.17738$xB4.13406@twister.southeast.rr.co m... > > I've seen lots of posts lately concerning the O2 sensor. Is there a way > to > > check them? I don't have any error codes, but I think that the downstream > > sensor close to the cat converter is not working. I have a '97 GC. > thanks! > > > > > > |
Re: O2 sensor
Even after a 50 mile or more warm up period, my 'catalyst' monitor is never
ready with a scan tool. I would like to be able to test the O2 sensor downstream from the converter to see if it is bad. I think this may have been a problem for a while. It may be related to a carbon problem I seem to have on occasion. My dealership has had this jeep for up to 2 days (when it starts to misfire) and they have never been able to correct it. A bottle of good fuel injector cleaner always 'fixes' it though. I have had thin, hard carbon deposits on several plugs in the past, and suspect that incorrect data from O2 sensors and rich fuel is probably to blame. I know there have been lots of comments about 'ordinary people' having scan tools on this site, but, apparently, some dealerships don't need them either. "TJim" <jim@ranlet.nospam.com> wrote in message news:MDOdnVZF6I8gseGiU-KYgg@comcast.com... > Why do you think that? > > -- > Jim > 98 TJ SE > 90 SJ GW > http://www.delawareja.com/gallery/JDJeep98 > > > "Cal" <codom1@triad.rr.com> wrote in message > news:CYVeb.17738$xB4.13406@twister.southeast.rr.co m... > > I've seen lots of posts lately concerning the O2 sensor. Is there a way > to > > check them? I don't have any error codes, but I think that the downstream > > sensor close to the cat converter is not working. I have a '97 GC. > thanks! > > > > > > |
Re: O2 sensor
The downstream 02 sensor, unlike the upstream 02 sensor, has no ability to
adjust the fuel mixture or for that matter, anything about how the engine runs. Its sole function is to check the cat for proper function and display a Check Engine light if it detects that the cat has gone bad. Jerry -- Jerry Bransford To email, remove 'me' from my email address KC6TAY, PP-ASEL See the Geezer Jeep at http://members.cox.net/jerrypb/ "Cal" <codom1@triad.rr.com> wrote in message news:ykWeb.17848$xB4.9228@twister.southeast.rr.com ... > Even after a 50 mile or more warm up period, my 'catalyst' monitor is never > ready with a scan tool. I would like to be able to test the O2 sensor > downstream from the converter to see if it is bad. I think this may have > been a problem for a while. It may be related to a carbon problem I seem to > have on occasion. My dealership has had this jeep for up to 2 days (when it > starts to misfire) and they have never been able to correct it. A bottle of > good fuel injector cleaner always 'fixes' it though. I have had thin, hard > carbon deposits on several plugs in the past, and suspect that incorrect > data from O2 sensors and rich fuel is probably to blame. I know there have > been lots of comments about 'ordinary people' having scan tools on this > site, but, apparently, some dealerships don't need them either. > "TJim" <jim@ranlet.nospam.com> wrote in message > news:MDOdnVZF6I8gseGiU-KYgg@comcast.com... > > Why do you think that? > > > > -- > > Jim > > 98 TJ SE > > 90 SJ GW > > http://www.delawareja.com/gallery/JDJeep98 > > > > > > "Cal" <codom1@triad.rr.com> wrote in message > > news:CYVeb.17738$xB4.13406@twister.southeast.rr.co m... > > > I've seen lots of posts lately concerning the O2 sensor. Is there a way > > to > > > check them? I don't have any error codes, but I think that the > downstream > > > sensor close to the cat converter is not working. I have a '97 GC. > > thanks! > > > > > > > > > > > > |
Re: O2 sensor
The downstream 02 sensor, unlike the upstream 02 sensor, has no ability to
adjust the fuel mixture or for that matter, anything about how the engine runs. Its sole function is to check the cat for proper function and display a Check Engine light if it detects that the cat has gone bad. Jerry -- Jerry Bransford To email, remove 'me' from my email address KC6TAY, PP-ASEL See the Geezer Jeep at http://members.cox.net/jerrypb/ "Cal" <codom1@triad.rr.com> wrote in message news:ykWeb.17848$xB4.9228@twister.southeast.rr.com ... > Even after a 50 mile or more warm up period, my 'catalyst' monitor is never > ready with a scan tool. I would like to be able to test the O2 sensor > downstream from the converter to see if it is bad. I think this may have > been a problem for a while. It may be related to a carbon problem I seem to > have on occasion. My dealership has had this jeep for up to 2 days (when it > starts to misfire) and they have never been able to correct it. A bottle of > good fuel injector cleaner always 'fixes' it though. I have had thin, hard > carbon deposits on several plugs in the past, and suspect that incorrect > data from O2 sensors and rich fuel is probably to blame. I know there have > been lots of comments about 'ordinary people' having scan tools on this > site, but, apparently, some dealerships don't need them either. > "TJim" <jim@ranlet.nospam.com> wrote in message > news:MDOdnVZF6I8gseGiU-KYgg@comcast.com... > > Why do you think that? > > > > -- > > Jim > > 98 TJ SE > > 90 SJ GW > > http://www.delawareja.com/gallery/JDJeep98 > > > > > > "Cal" <codom1@triad.rr.com> wrote in message > > news:CYVeb.17738$xB4.13406@twister.southeast.rr.co m... > > > I've seen lots of posts lately concerning the O2 sensor. Is there a way > > to > > > check them? I don't have any error codes, but I think that the > downstream > > > sensor close to the cat converter is not working. I have a '97 GC. > > thanks! > > > > > > > > > > > > |
Re: O2 sensor
Thanks!
"Jerry Bransford" <jerrypb@mecox.net> wrote in message news:bvWeb.37369$gv5.16849@fed1read05... > The downstream 02 sensor, unlike the upstream 02 sensor, has no ability to > adjust the fuel mixture or for that matter, anything about how the engine > runs. Its sole function is to check the cat for proper function and display > a Check Engine light if it detects that the cat has gone bad. > > Jerry > -- > Jerry Bransford > To email, remove 'me' from my email address > KC6TAY, PP-ASEL > See the Geezer Jeep at > http://members.cox.net/jerrypb/ > > "Cal" <codom1@triad.rr.com> wrote in message > news:ykWeb.17848$xB4.9228@twister.southeast.rr.com ... > > Even after a 50 mile or more warm up period, my 'catalyst' monitor is > never > > ready with a scan tool. I would like to be able to test the O2 sensor > > downstream from the converter to see if it is bad. I think this may have > > been a problem for a while. It may be related to a carbon problem I seem > to > > have on occasion. My dealership has had this jeep for up to 2 days (when > it > > starts to misfire) and they have never been able to correct it. A bottle > of > > good fuel injector cleaner always 'fixes' it though. I have had thin, hard > > carbon deposits on several plugs in the past, and suspect that incorrect > > data from O2 sensors and rich fuel is probably to blame. I know there > have > > been lots of comments about 'ordinary people' having scan tools on this > > site, but, apparently, some dealerships don't need them either. > > "TJim" <jim@ranlet.nospam.com> wrote in message > > news:MDOdnVZF6I8gseGiU-KYgg@comcast.com... > > > Why do you think that? > > > > > > -- > > > Jim > > > 98 TJ SE > > > 90 SJ GW > > > http://www.delawareja.com/gallery/JDJeep98 > > > > > > > > > "Cal" <codom1@triad.rr.com> wrote in message > > > news:CYVeb.17738$xB4.13406@twister.southeast.rr.co m... > > > > I've seen lots of posts lately concerning the O2 sensor. Is there a > way > > > to > > > > check them? I don't have any error codes, but I think that the > > downstream > > > > sensor close to the cat converter is not working. I have a '97 GC. > > > thanks! > > > > > > > > > > > > > > > > > > > > |
Re: O2 sensor
Thanks!
"Jerry Bransford" <jerrypb@mecox.net> wrote in message news:bvWeb.37369$gv5.16849@fed1read05... > The downstream 02 sensor, unlike the upstream 02 sensor, has no ability to > adjust the fuel mixture or for that matter, anything about how the engine > runs. Its sole function is to check the cat for proper function and display > a Check Engine light if it detects that the cat has gone bad. > > Jerry > -- > Jerry Bransford > To email, remove 'me' from my email address > KC6TAY, PP-ASEL > See the Geezer Jeep at > http://members.cox.net/jerrypb/ > > "Cal" <codom1@triad.rr.com> wrote in message > news:ykWeb.17848$xB4.9228@twister.southeast.rr.com ... > > Even after a 50 mile or more warm up period, my 'catalyst' monitor is > never > > ready with a scan tool. I would like to be able to test the O2 sensor > > downstream from the converter to see if it is bad. I think this may have > > been a problem for a while. It may be related to a carbon problem I seem > to > > have on occasion. My dealership has had this jeep for up to 2 days (when > it > > starts to misfire) and they have never been able to correct it. A bottle > of > > good fuel injector cleaner always 'fixes' it though. I have had thin, hard > > carbon deposits on several plugs in the past, and suspect that incorrect > > data from O2 sensors and rich fuel is probably to blame. I know there > have > > been lots of comments about 'ordinary people' having scan tools on this > > site, but, apparently, some dealerships don't need them either. > > "TJim" <jim@ranlet.nospam.com> wrote in message > > news:MDOdnVZF6I8gseGiU-KYgg@comcast.com... > > > Why do you think that? > > > > > > -- > > > Jim > > > 98 TJ SE > > > 90 SJ GW > > > http://www.delawareja.com/gallery/JDJeep98 > > > > > > > > > "Cal" <codom1@triad.rr.com> wrote in message > > > news:CYVeb.17738$xB4.13406@twister.southeast.rr.co m... > > > > I've seen lots of posts lately concerning the O2 sensor. Is there a > way > > > to > > > > check them? I don't have any error codes, but I think that the > > downstream > > > > sensor close to the cat converter is not working. I have a '97 GC. > > > thanks! > > > > > > > > > > > > > > > > > > > > |
Re: O2 sensor
Actually, the PCM will use downstream O2 input to "fine tune" fuel trim in
addition to monitoring the cat. The OP didn't say what engine he had, but there's a TSB for 4.0L engines concerning decarbonizing the combustion chamber and revised valve springs. In message <bvWeb.37369$gv5.16849@fed1read05>, "Jerry Bransford" wrote: >The downstream 02 sensor, unlike the upstream 02 sensor, has no ability to >adjust the fuel mixture or for that matter, anything about how the engine >runs. Its sole function is to check the cat for proper function and display >a Check Engine light if it detects that the cat has gone bad. > >Jerry |
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