Question about 1989 Honda Civic

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Failed emissions test. nox levels high. - 1989 Honda Civic

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 194 Answers

SOURCE: 1991 Honda Accord LX failed emission test on smog

not enough info. Typically, CO and HC together can be the result of poor fuel control or misfire, or worn components such as O2 sensor or catalytic converter, but without more data, repair recommendations are likely to waste money and not achieve success.

Posted on Sep 12, 2009

YellowNo5
  • 268 Answers

SOURCE: failed emission NOx on a 93 Honda accord ex its

The only thing I can think of checking would be the EGR valve, a faulty cat converter or faulty o2 sensor. Converter shouldn't set off check engine light though unless it is clogged causing too much back pressure, most likely EGR Valve.

Posted on Oct 02, 2009

alicantecoli
  • 22095 Answers

SOURCE: 1994 honda accord failed its emisions test.

i would say change the O2 sensors and a new cat ,these readings are well over the top ,could have a exhaust blow on exhaust as well which will throw out the O2 readings

Posted on Nov 07, 2009

  • 1 Answer

SOURCE: 1989 Honda Accord with 275,500 failed emission test

Many things can cause CO2 but make sure you don't leave out the simple stuff because it worked for me last year on a 94 accord with 260,000miles..
Change the aircleaner, plugs, pcv valve and change the oil and oil filter as well. I would also suggest an Oxygen sensor as well..
Your cat converter is also important for co2 emissions..
I doubt leaking injectors would raise co2 but that will increase mileage etc and who knows, I could be wrong but I wouldn't count on orings being your issue...
Blow by from worn rings and valve seals are all things that will increase co2.. Having an old car is not easy these days..

Posted on Apr 10, 2010

  • 158 Answers

SOURCE: My 1997 Honda Civic failed

Jose, I don't know if this will give you the answer you are looking for because there are many things to consider here. The exhaust gas recirculation valve (EGR) is one of the main things involved in reducing NO emissions. This valve is controled by the power control module. (PCM) This is your vehicles computer. The PCM monitors the vehicles speed and will command the EGR to open when the vehicle attains a certain speed, which is why the ASM test being done is recorded at two different speeds. At 25 MPH your vehicle failed the hydrocarbon (HC) emissions limit and this could be for a number of reasons. When is the last time you car was tuned up? Old spark plugs, wires, clogged air filters, oxygen sensors, leaking injectors (personal experience) or the PCV valve could be contributing to the results of the test. I guess that the easiest way to go is to tune up the engine replacing the spark plugs, wires, air filter and the PCV valve and don't forget to have the oil changed at the same time. Only then should have the vehicle retested and see what the results are. Should it fail again you may have to consider having the EGR or the catalytic converter replaced depending on what portion of the test fails. If the NO fails I would consider the EGR. If the HC fails then I would consider the catalytic converter. Good luck with this.

Posted on Apr 05, 2011

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fist i would like you to post the year make and model of the truck along with the HC ppms and NOX ppm it would be very helpful but high hc and nox can be attributed to a faulty EGR system nox is produced when the combustion chamber temperature gets too high so a small amount of exhaust is cycled back into the air stream to help cool them there are other causes but without looking at the levels its much harder to say

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EGR Ehaust Gas Recirculation system.the basic component is vacuum-operated control valve that recirculates the exhaut gases through the engine the engine intake manifld and cylinders where they recombine with the incoming air/fuel mixture.The check need special equipment, to some workshop.
sincerely. God bless you.

ernesto cuadra
managua, nicaragua. c.a

see the diagram for details.
3_29_2012_8_23_30_pm.jpg

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Your EGR is plug or is non operational,When the EGR is not plug and is in operational its job is to cool the combustion chamber thus lowering Nox.

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here are the possible causes of high nox levels, Misfire condition
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Corroded or damaged engine sensor electrical connections.the best advice is to take it to a emission specialist to check it out! good-luck!

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