My 93 Accord which has 191K on it failed emissions today with regards to Nox gases...Anyone elses Accord fail emissions because of Nox, and how much did it cost for repair? Thanks in advance

 

where are you located and what kind of car is it? auto or stick? Your in LA somewhere? Modded?

Post the numbers (H2, CO, NOx) and maybe we can get a better idea of what's going on besides just failing NOx.

 

Posting the numbers would help narrow it down, but I'll bet you've got clogged EGR ports, at least.

 

well here are the numbers....i live in maryland btw.....Oxides of Nitrogen standard 2.3 GPM...im at 3.6519.....keep in mind my car has been maintained all through its 191,000 miles....

 

Not sure if it works for NOx but take the car out and drive the **** out of it. Trust me i worked at an emissions place for a week i know these things haha. My brothers car failed a few times and so did our jeep so we took em both out kept em above 80 as much as possible and they both passed. Also in MD if you have a lowered car or rims or anything they do not make you get on the dyno test or whatever they let you do an idle test. If you get lucky enough to get an idle test when they say let it idle keep your foot on the gas alittle that usually makes cars pass. Thats basically the only tricks i learn during my week of employment there. Hope it helps Sorry i could not tell you what is actually wrong with your car just how to cheat the system.

 

I won't ask about your 1 big week working for an MD emission test station.

 

If you only failed on the NOx emissions, then more than likely you just need a new catalytic converter. That's what the cat does. They also stop working very well after about 100,000 miles. Sometimes a lot less.

As for the other stuff on emissions test, driving down the highway gets everything warmed up and all the sensors functioning like they're supposed to. So if you fail anything besides the NOx, run a bottle of feul injector cleaner through and do what Accord15 said to do. Hope this helps.

 

It's clogged EGR passageways. Not the convertor unless your throwing high H2 and CO levels (which you didn't post btw) . I think your NOx levels put you in gross polluter range. You should notice your oil is super black at oil change and propably burning off at least a quart.

Unfortunately your engine doesn't have access ports to get to where you need to get to. On 94+, there is a service port underneath the fuelrail. However pre93 need to fabricate their own port...it involves drilling out the timples (?) and creating your own access. There is the space for it....it's just in those years they didn't bother to create an actual hatch that can removed without some fabrication. Talk to a couple mecahnics about what you need to do....
1) depressurize fuel system & remove fuel rail
2) create service port to EGR passageways by drilling out timples (underneath fuel rail)
3) clean passsageways with solvent/brushes
4) tune up and you should now pass.

its probably going to be a $250+ job to be honest.

 

[QUOTE]It's clogged EGR passageways. Not the convertor unless your throwing high H2 and CO levels (which you didn't post btw) . I think your NOx levels put you in gross polluter range. You should notice your oil is super black at oil change and propably burning off at least a quart.

Ahhh. A voice of wisdom in the wilderness. Thank you. On some early models, you can drill and tap a screw into the clean out ports. Using a slide hammer or some other ingenious method, you can pop out the plugs. This allows you to clean out the crud from the EGR ports. You can re-install the same plugs and seal the hole from the screw with JB weld or some other such product. It is a do-it-yourself job if you have basic skills.