High Nitrous Emissions..

I need to reduce the oxides of nitrous emissions in my 1996 dodge ram 1500 4x4. Is there any tricks or ideas i can try to reduce these emissions? any
ideas or suggestions?

try this thread. It's in the toyota camry forum, but I think it will help if you read through it.

Generally things that cause emissions failures are timing, clogged (vacuum) lines, bad o2 sensors, and bad cats.

Do you have actual numbers and how much you need to lower by so we know what type of options are worth trying or not?

yes, my nitrogen readings were 1.3569 and the maximum allowable is 1.1200 so it is not off by much. I replaced the cat and the O2 sensor after the cat. There is two o2 sensors on mine but i believe the rear one failed. I also changed my distributor cap and rotor. This is my second time failing the emissions test, however, significantly lower readings after replacing these few things. heres the comparison before and after.
Before After




Hydrocarbons(allowable=0.5000) .486 .0860

Carbon monoxide(allowable=8.08) 5.13 .4274

Oxides of Nitrogen(allowable=1.12) 1.94 1.3569

Everything was lowered quite a bit, and so close on the nitrogen emissions. Hope this information helps, any feedback would be great. thanks so much!

What type of spark plugs/wires are you using? When was the last time they were changed?

I have the mopar plug wires with the bosch platinum 4 plugs. they were replaced roughly 20 000 kms ago. the plugs look perfect still. Do u think the wires would affect my nitrous emissions? thanks alot for your help any information is much appreciated.

NOX is caused by high combustion chamber temperature. Plugs and wire would cause high HC. EGR system is what is used to help control NOX. www.aircare.ca (http://www.aircare.ca) gives an explanation of this. You could ck their website to get some pointers on what to do. They have a pretty good site.

I've known people that had crappy plugs (i consider bosch plat+4 to be pretty bad) and it caused all sorts of problems with their engines, including a bit of nox increase.

But jp makes great sense, EGR is a much greater contributor to NOx than plugs can be. Do you have any engine codes?

What would you reccomend for plugs? thought those platinums were pretty good quality but shows what i know. im going to go through my EGR system with a fine tooth comb and make sure there are no plugged or cracked hoses. I really appreciate all the help and if you have any other suggestions please do let me know, its getting down to the wire...

don't know what type of engine you have, but go to sparkplugs.com. The stock plugs are most likely Champions. don't forget antisieze on the threads and dielectric grease on the connections.

champion plugs are recomended for all mopar engines bosch are the top of the line plugs but do not work in mopar

Finally got it passed! ran some high octane gas with a methol hydrate mix and just squeeked by :smokin:.. thanks to everyone and all your help its greatly appreciated and keep up the good work!

glad that methyl hydrate worked for you.