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#11
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Excellent, thanks!
Yes I went to a $tealer for it. They 'forgot' to do the CCV recall though... Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Mike M wrote: > > In article >, says... > > Yup, our 88 failed it's first emissions and when they punched it up, the > > O2 was under recall. After the recall it passed with low numbers. I > > have told this to others and others have posted it. Apparently the 88 > > to 91's with the renix computer have bad O2 sensors. > > > > Mike > > After reading your post I Googled and found this. > http://alldata.com/TSB/04/890417D4.html > > So, did you take it to a dealer and get it replaced? > -- > "Trust me, I do this all the time" > Mike M |
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#12
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#13
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Hi Mike,
Like everyone has already said have it at full operating temperature, I run it down the freeways at traffic speed (80) for about twenty minutes and then let it idle to wait my turn to keep the catalytic convert hot at sixteen hundred degrees: http://billhughes.com/smog.jpg Of course do the normal maintenance, oil, filters, and plugs. And I did replace the convert about ten years ago, as that's it's job to chemically changes pollutants like carbon monoxide (CO), hydrocarbons (HC), oxides of Nitrogen (NOx) and particulate matter (PM) into harmless substances like carbon dioxide (CO2), nitrogen (N2), and water vapor (H2O): http://www.tifac.org.in/do/hgt/case/convert.htm God Bless America, ßill O|||||||O http://www.billhughes.com/ 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 |
#14
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Mike M wrote:
> > In article >, > says... > > Excellent, thanks! > > > MR> Yes I went to a $tealer for it. They 'forgot' to do the CCV recall > though... > > I'm sure it was just an oversight. > -- > "Trust me, I do this all the time" > Mike M Something like the 3 tests they gave and the parts they sold me and put on to get me up to the amount of for a 'money spent' exemption only to have the emissions computer reject the exemption because of the emissions recall. Interesting enough I still failed miserably with all their 'expert' diagnosis and parts and spent money and right after they did the free recall for the O2, it passed with flying colors.... Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's |
#15
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It is the O2 sensor. Your cat may now be ruined as well from getting too
rich a mixture put through it. Dont just replace the cat, fix the problem then fix the cat. KH "Mike M" > wrote in message .. . > 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 > |
#16
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One thing no one mentions. Most cars should pass the sniff test without the
cat operating if everything else is functioning correctly. KH "L.W. ("ßill") Hughes III" > wrote in message ... > Hi Mike, > Like everyone has already said have it at full operating > temperature, I run it down the freeways at traffic speed (80) for about > twenty minutes and then let it idle to wait my turn to keep the > catalytic convert hot at sixteen hundred degrees: > http://billhughes.com/smog.jpg Of course do the normal maintenance, oil, > filters, and plugs. And I did replace the convert about ten years ago, > as that's it's job to chemically changes pollutants like carbon monoxide > (CO), hydrocarbons (HC), oxides of Nitrogen (NOx) and particulate matter > (PM) into harmless substances like carbon dioxide (CO2), nitrogen (N2), > and water vapor (H2O): http://www.tifac.org.in/do/hgt/case/convert.htm > God Bless America, ßill O|||||||O > http://www.billhughes.com/ > > 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 |
#17
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#18
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#19
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Congratulations.
God Bless America, ßill O|||||||O http://www.billhughes.com/ Mike M wrote: > > Replaced the EGR valve, changed the oil, Can of fuel injection cleaner > and half a tank of premium gas. > 25 MPH on the NO(PPM)got a 650 reading this time. > -- > "Trust me, I do this all the time" > Mike M |
#20
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The "half a tank of premium gas" caught my eye. Disregarding for the moment the differences in additive formulations between manufacturers, (the gasoline "slug" in the pipeline is the same if it goes to the Exxon/Mobil plant or the Shell plant or the BP plant, the only difference is in what they add to it before it goes out in the tanker truck) would/should higher octane gas make any positive difference in emissions? On Sun, 23 Jan 2005, Mike M wrote: > In article >, > says... > > Replaced the EGR valve, changed the oil, Can of fuel injection cleaner > and half a tank of premium gas. > 25 MPH on the NO(PPM)got a 650 reading this time. > -- > "Trust me, I do this all the time" > Mike M > > -- "I defer to your plainly more vivid memories of topless women with whips....r" R. H. Draney recalls AFU in the Good Old Days. |
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