Question about 1989 Honda Civic
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Posted on Jan 02, 2017
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
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
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
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
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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