Failed Califoria smog test.
 

My son's 89 6 cyl.Cherokee just barely failed the Ca. smog test. It
passed the 15 MPH but failed at 25 MPH on the "NO(PPM)" part of the test
(max allowed is 875 PPM.his read 1066 PPM). Anyone have any ideas what
the problem might be?
The mechanic told him it is probably either the O2 sensor or the
catalytic converter.
TIA
--
"Trust me, I do this all the time"
Mike M

Re: Failed Califoria smog test.
 

Aside from the good advice you already received, I can only add to make
darned sure it has the proper 195 degree thermostat installed. If the
engine isn't warmed up fully to the 195 degree reading, it won't pass
the smog test. Make sure the engine is as hot as possible before
running the test again.

Jerry

Mike M wrote:
> My son's 89 6 cyl.Cherokee just barely failed the Ca. smog test. It
> passed the 15 MPH but failed at 25 MPH on the "NO(PPM)" part of the test
> (max allowed is 875 PPM.his read 1066 PPM). Anyone have any ideas what
> the problem might be?
> The mechanic told him it is probably either the O2 sensor or the
> catalytic converter.
> TIA

--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.cox.net/jerrypb/

Re: Failed Califoria smog test.
 

Aside from the good advice you already received, I can only add to make
darned sure it has the proper 195 degree thermostat installed. If the
engine isn't warmed up fully to the 195 degree reading, it won't pass
the smog test. Make sure the engine is as hot as possible before
running the test again.

Jerry

Mike M wrote:
> My son's 89 6 cyl.Cherokee just barely failed the Ca. smog test. It
> passed the 15 MPH but failed at 25 MPH on the "NO(PPM)" part of the test
> (max allowed is 875 PPM.his read 1066 PPM). Anyone have any ideas what
> the problem might be?
> The mechanic told him it is probably either the O2 sensor or the
> catalytic converter.
> TIA

--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.cox.net/jerrypb/

Re: Failed Califoria smog test.
 

Aside from the good advice you already received, I can only add to make
darned sure it has the proper 195 degree thermostat installed. If the
engine isn't warmed up fully to the 195 degree reading, it won't pass
the smog test. Make sure the engine is as hot as possible before
running the test again.

Jerry

Mike M wrote:
> My son's 89 6 cyl.Cherokee just barely failed the Ca. smog test. It
> passed the 15 MPH but failed at 25 MPH on the "NO(PPM)" part of the test
> (max allowed is 875 PPM.his read 1066 PPM). Anyone have any ideas what
> the problem might be?
> The mechanic told him it is probably either the O2 sensor or the
> catalytic converter.
> TIA

--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.cox.net/jerrypb/

Re: Failed Califoria smog test.
 

Mike M <d_michael_m@hottmaill.com> wrote in
news:MPG.1c5ad02aab765f9498989c@news.verizon.net:

> My son's 89 6 cyl.Cherokee just barely failed the Ca. smog test. It
> passed the 15 MPH but failed at 25 MPH on the "NO(PPM)" part of the test
> (max allowed is 875 PPM.his read 1066 PPM). Anyone have any ideas what
> the problem might be?
> The mechanic told him it is probably either the O2 sensor or the
> catalytic converter.
> TIA

Same thing happened to me. My '88 YJ failed miserably, though. I tried
everything I could think of to get it to pass. Finally I took it in to the
shop. The mechinic had me start it. First thing he came up with is the cat
converter was bad (granted it did sound like a baby rattle). After
replacing the converter and O2 sensor, I passed with reading down around
where they were when my Jeep was new.

Dave

Re: Failed Califoria smog test.
 

Mike M <d_michael_m@hottmaill.com> wrote in
news:MPG.1c5ad02aab765f9498989c@news.verizon.net:

> My son's 89 6 cyl.Cherokee just barely failed the Ca. smog test. It
> passed the 15 MPH but failed at 25 MPH on the "NO(PPM)" part of the test
> (max allowed is 875 PPM.his read 1066 PPM). Anyone have any ideas what
> the problem might be?
> The mechanic told him it is probably either the O2 sensor or the
> catalytic converter.
> TIA

Same thing happened to me. My '88 YJ failed miserably, though. I tried
everything I could think of to get it to pass. Finally I took it in to the
shop. The mechinic had me start it. First thing he came up with is the cat
converter was bad (granted it did sound like a baby rattle). After
replacing the converter and O2 sensor, I passed with reading down around
where they were when my Jeep was new.

Dave

Re: Failed Califoria smog test.
 

Mike M <d_michael_m@hottmaill.com> wrote in
news:MPG.1c5ad02aab765f9498989c@news.verizon.net:

> My son's 89 6 cyl.Cherokee just barely failed the Ca. smog test. It
> passed the 15 MPH but failed at 25 MPH on the "NO(PPM)" part of the test
> (max allowed is 875 PPM.his read 1066 PPM). Anyone have any ideas what
> the problem might be?
> The mechanic told him it is probably either the O2 sensor or the
> catalytic converter.
> TIA

Same thing happened to me. My '88 YJ failed miserably, though. I tried
everything I could think of to get it to pass. Finally I took it in to the
shop. The mechinic had me start it. First thing he came up with is the cat
converter was bad (granted it did sound like a baby rattle). After
replacing the converter and O2 sensor, I passed with reading down around
where they were when my Jeep was new.

Dave

Re: Failed Califoria smog test.
 

The O2 sensor is under recall. If the vehicle hasn't had the recall
done, it is still a free fix. It then will likely pass...

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Mike M wrote:
>
> My son's 89 6 cyl.Cherokee just barely failed the Ca. smog test. It
> passed the 15 MPH but failed at 25 MPH on the "NO(PPM)" part of the test
> (max allowed is 875 PPM.his read 1066 PPM). Anyone have any ideas what
> the problem might be?
> The mechanic told him it is probably either the O2 sensor or the
> catalytic converter.
> TIA
> --
> "Trust me, I do this all the time"
> Mike M

Re: Failed Califoria smog test.
 

The O2 sensor is under recall. If the vehicle hasn't had the recall
done, it is still a free fix. It then will likely pass...

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Mike M wrote:
>
> My son's 89 6 cyl.Cherokee just barely failed the Ca. smog test. It
> passed the 15 MPH but failed at 25 MPH on the "NO(PPM)" part of the test
> (max allowed is 875 PPM.his read 1066 PPM). Anyone have any ideas what
> the problem might be?
> The mechanic told him it is probably either the O2 sensor or the
> catalytic converter.
> TIA
> --
> "Trust me, I do this all the time"
> Mike M

Re: Failed Califoria smog test.
 

The O2 sensor is under recall. If the vehicle hasn't had the recall
done, it is still a free fix. It then will likely pass...

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Mike M wrote:
>
> My son's 89 6 cyl.Cherokee just barely failed the Ca. smog test. It
> passed the 15 MPH but failed at 25 MPH on the "NO(PPM)" part of the test
> (max allowed is 875 PPM.his read 1066 PPM). Anyone have any ideas what
> the problem might be?
> The mechanic told him it is probably either the O2 sensor or the
> catalytic converter.
> TIA
> --
> "Trust me, I do this all the time"
> Mike M