Failed Emission - Need Help!!
05-01-2005, 04:22 AM
#1
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Failed Emission - Need Help!!
1994 Honda Civic - Turbo
Catco catalytic converter - about 3 years old
I failed the Nitrogen Oxide (NOx) part of the test. I need some suggestions on what I can do to pass.
Thanks in advance for all the help.
Catco catalytic converter - about 3 years old
I failed the Nitrogen Oxide (NOx) part of the test. I need some suggestions on what I can do to pass.
Thanks in advance for all the help.
05-01-2005, 07:26 AM
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Re: Failed Emission - Need Help!!
Originally Posted by rudebwoy
I have no idea what that is. but you can put everything back to stock for the inspection, or just turn down the boost and fuel management
So rudebwoy, whe yu de now? Yu inna Germany, Iraq or yu de a Yard? Enny whe yu de, tek care yu hear sah!
05-01-2005, 07:29 AM
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Re: Failed Emission - Need Help!!
Originally Posted by thermal
put the stock car back on. turning the boost down will not affect anything since you are not boosting while getting inspected. Are you running bigger injectors?
05-01-2005, 08:57 AM
#6
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Re: Failed Emission - Need Help!!
Originally Posted by StanB
Originally Posted by rudebwoy
I have no idea what that is. but you can put everything back to stock for the inspection, or just turn down the boost and fuel management
So rudebwoy, whe yu de now? Yu inna Germany, Iraq or yu de a Yard? Enny whe yu de, tek care yu hear sah!
I only did that smog inspection when I was station in California, and I had to pay the shop $200 to get by because I failed everything from visual to sniffer. maybe thats your best bet, offer the shop some money.
05-01-2005, 09:27 AM
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Re: Failed Emission - Need Help!!
NOx gas is basically created by high cylinder temperatures when the fuel is being burned. There's a couple of way's you might be able to get around this. An EGR system would certainly help reduce NOx gas by more efficiently recirculating unburned fuel and creating a more complete burn, reducing cylinder temperatures. But, there's also going to be some downside to having an EGR system on your vehichle.
Another way you might be able to pass is if you get to the inspection station and allow your engine to completely cool down before testing. You could very well pass then.
Or, by retarding your ignition timing so your spark is closer to the top of the compression stroke, your cylinder pressures and temperatures should be reduced and lower the ammount of NOx gas produced.
Good luck man- Steve
Oh yeah, slipping the guy a $50 never hurts matter's either
Another way you might be able to pass is if you get to the inspection station and allow your engine to completely cool down before testing. You could very well pass then.
Or, by retarding your ignition timing so your spark is closer to the top of the compression stroke, your cylinder pressures and temperatures should be reduced and lower the ammount of NOx gas produced.
Good luck man- Steve
Oh yeah, slipping the guy a $50 never hurts matter's either
05-01-2005, 10:25 AM
#8
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Join Date: Sep 2003
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Re: Failed Emission - Need Help!!
Originally Posted by tranceminister
NOx gas is basically created by high cylinder temperatures when the fuel is being burned. There's a couple of way's you might be able to get around this. An EGR system would certainly help reduce NOx gas by more efficiently recirculating unburned fuel and creating a more complete burn, reducing cylinder temperatures. But, there's also going to be some downside to having an EGR system on your vehichle.
Another way you might be able to pass is if you get to the inspection station and allow your engine to completely cool down before testing. You could very well pass then.
Or, by retarding your ignition timing so your spark is closer to the top of the compression stroke, your cylinder pressures and temperatures should be reduced and lower the ammount of NOx gas produced.
Good luck man- Steve
Oh yeah, slipping the guy a $50 never hurts matter's either
Another way you might be able to pass is if you get to the inspection station and allow your engine to completely cool down before testing. You could very well pass then.
Or, by retarding your ignition timing so your spark is closer to the top of the compression stroke, your cylinder pressures and temperatures should be reduced and lower the ammount of NOx gas produced.
Good luck man- Steve
Oh yeah, slipping the guy a $50 never hurts matter's either
Tranceminister, I reached at the inspection station early and let the car cool down. The temperature gauge needle was on the zero line but the guy said he has to warm up the car to a certain temperature. I am going to retard the timing before I go back this weekend.
Thanks to everyone for your input.
05-01-2005, 11:08 AM
#9
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Re: Failed Emission - Need Help!!
Retarding timing raises cylinder temps which raises Nox, dont do that. Richening up the mixture will reduce Nox but raise HC and CO. What motor is this on? At the very least I would put a stock cat on it, that would help a lot.
