? about emissions

[jeepin_madness]

1047721

I recently took my 95 YJ in for emissions testing. It failed due to too high of a reading on Oxides of Nitrogen. My question is what causes this to be high? Also how can I lower it? Also it passed with flying colors on Hydrocarbons & Carbon Monooxide. Why would these other readings pass so well and the Oxides of Nitrogen fail so poorly?[addsig]

 

[MudderChuck]

1047758

Got me, all I can say is don´t sniff the tailpipe if it´s putting out too much NO.

Laughing gas. A bottle of JD usually cures my immision problems. I think most of the tests are a hoax anyway. Stick some money in and get a certification.[addsig]

 

[jeepin_madness]

1047760

I agree. I think the tests are just a way for the state to make more money. It's just strange to me that 2 of 3 things tested for pass well below state standards at like half the max allowed yet the 1 thing fail by more than 1.3 GPM[addsig]

 

[jeepmaster]

1047777

haha iowa has no emissons tests.[addsig]

 

[MudderChuck]

1047781

I had one that failed two out of three. But for the life of me I can´t remember what it failed, I recollect it was 02. The machine was right, I had a slightly deformed valve and slightly low comression in one cylinder, due to a very minor head gasket leak. Talked to a few of my friends, in the know and they say, the way to do it is to go to a private state authorized smog tester and have him type your information on the last Jeeps results that passed. My understanding is there is about one clean Jeep within about 50 miles of here, that is supplying the information for everybody else. I wonder if anybody will ever notice the Jeep immision numbers in my county are all identical.

If they were really serious about immisions, they would have required the manufactures to designed a multi-fuel clean motor a long time ago, instead of messing with the consumer. I´ve been researching changing my Jeep over to compressed natural gas and not telling the guy at the next smog test and see what he says. At about three grand it´s kinda pricey, did you know Dodge had a propane option in 1981 for three hundred and change?

Had an aquaintance that got busted for tax evasion for converting to propane. Crossed a national border and they where testing gas color to see who filled up in the next country and charging them tax. Found out it was legal to run propane, as long as you paid your gasoline tax, go figure.

[addsig]

 

[Craig]

1047782

I live in Vancouver, BC, Canada, we have some of the most strict emmissions laws around (pretty much the same as California). I've found that your car can both pass and fail on the same day without making adjustments depending on how warm your motor is and the temperature outside. Some things that I know of that people around here do to get through emmissions is to make sure your engine is completely warmed up...take it out for a good rip and floor it around a little bit, this will burn off carbons that have built up in your motor, use a good grade clean burning fuel (I go to Mohawk gas stations because they have that ethonol fuel made out of wheat which is supposed to burn cleaner), a lot of people around here add methonal hydrate (I think that is what it is called) which is available at most hardware stores, and I've been told that taking it through on a colder day is better than a warmer day because cold air has more oxygen which burns more of the fuel resulting in less unburnt fuel going out the tailpipe, and if you know anyone that works there, buy him a case of beer to pass you. If all that fails, you could do what I did years ago back in highschool which is to cut a hole in your tailpipe and trunk and run the exhaust into your trunk but let just enough pass through to your tailpipe (I was in highschool with little money and desperate to pass).[addsig]

 

[jeepin_madness]

1047783

<TABLE BORDER=0 ALIGN=CENTER WIDTH=85%><TR><TD><font class="pn-sub">Quote:</font><HR></TD></TR><TR><TD><FONT class="pn-sub"><BLOCKQUOTE>haha iowa has no emissons tests.</BLOCKQUOTE></FONT></TD></TR><TR><TD><HR></TD></TR></TABLE>







Give it a few more years. The Imperial Federal Govt. and the EPA will move in on Iowa as well. Most of Maryland has had testing since around 1984. The county I am in has only had to deal with it for about 6 years now. [addsig]

 

[MudderChuck]

1047810

I like your quote Madness.



One of my favorites is, "About as fast as the engineers can develope and idiot proof machine, God produces a better idiot".

Merry Christmas, Mudder[addsig]

 

[jeepmaster]

1047820

my dad was telling me something about holding the RPM's around 3000 got him through or something. maybe you could try a few revs to get her through. i can double check with him if anyone wants more info~[addsig]

 

[jeepin_madness]

1047832

<TABLE BORDER=0 ALIGN=CENTER WIDTH=85%><TR><TD><font class="pn-sub">Quote:</font><HR></TD></TR><TR><TD><FONT class="pn-sub"><BLOCKQUOTE> I like your quote Madness.



One of my favorites is, "About as fast as the engineers can develope and idiot proof machine, God produces a better idiot".

Merry Christmas, Mudder</BLOCKQUOTE></FONT></TD></TR><TR><TD><HR></TD></TR></TABLE>



A good friend of my grandparents used to say that all the time. Its one of my favorite lines

[addsig]

 

[jeepin_madness]

1047833

<TABLE BORDER=0 ALIGN=CENTER WIDTH=85%><TR><TD><font class="pn-sub">Quote:</font><HR></TD></TR><TR><TD><FONT class="pn-sub"><BLOCKQUOTE>my dad was telling me something about holding the RPM's around 3000 got him through or something. maybe you could try a few revs to get her through. i can double check with him if anyone wants more info~</BLOCKQUOTE></FONT></TD></TR><TR><TD><HR></TD></TR></TABLE>



they have changed the testing here so that it has to have the treadmill (dyno) test, where they drive it at highway speeds. the only thing I hate about that is that u have to let some idiot get in your car and let them drive it on the traedmill. I dont like the fact that I have to let some yoyo drive my vehicle...even though its not really going anywhere it just the point of letting someone I dont know behind the wheel

[addsig]

 

[jcooper]

1047841

Maryland is a socialist commune. I grew up here, and plan to move to Virginia as soon as possible.



As for emmissions (So I at least appear to be on topic)

Test it once more to see if you get the same results. On the odd chance you do, this may help. Keep in mind this is based on the following guesswork:



Hydrocarbons = "Partially burned fuel"

CO = product of combustion

NO2 = another product of combustion

O2 = needed component for combustion



Since Hydrocarbons, CO, and presumably, O2 were okay, my guess would be the catalytic converter is not doing its job. Okay, I ran "Catalytic converter NO" through google, check out this site:



http://biz.howstuffworks.com/catalytic-converter.htm?printable=1



If you have the newer catalytic converter, the ceramic element which converts the NOx is probably bad. You may want to find out what type of cat you have on that jeep.



As for a favorite quote (badly paraphrased):



"To achieve a thousand victories in a thousand battles is not the acme of skill.

Rather, the acme of skill is to subdue the enemy without a fight."

The Art of War, Sun Tzu



jcooper[addsig]

 

[jeepin_madness]

1047848

Thanks jcooper I'll check into that. As for Maryland I have lived here all my life 27 yrs and I hate it more and more each day. Planning on getting out of here in the next couple years myself.....hopefully[addsig]

 

[MudderChuck]

1047851

Wondered what turned my dad into a raging liberal, he married one from Maryland, I guess she converted him.



A close look at the flex connector for the catalytic injector tubing might be usefull. They often fail and can sure affect cat performance.



Sun Tzu is my marriage manual, heaven help me, if the wife ever reads it.



My kids favorite quote is "old as dirt and half as funny".

Blocking the radiator (220F) opening up the intake, using slower burning fuels (higher octane) and running at peak torque (2400-2600 RPM) have helped me in the past.



It often turns out to be a general automotive thing, basic motor stuff.



Good luck, Chuck.[addsig]