Question about 1995 Honda Civic
My 1995 honda civic recently failed emissions. The readout says: H-C 124 PPM ;(pass)174 PPM (fail) CO 1.02% (fail) 1.13% (fail); CO2 14.60% 14.50% ; NOX 664 PPM (pass) 6/4 PPM (pass). The gentleman at the emissions place gave me a list of things it might be. I'm going to replace spark plugs, wires, air filter, distributor cap today. But the carbon emissions problem, one of them seems to be a PCV system. There are several components to the PCV system after some research... I don't know much about cars but I'm handy with some tools and a youtube video. I cannot at all afford to take my car to a mechanic to have them fix the issue so my car can pass. I'd like to do it myself. So my question is, which component of the PCV system could be the problem? valve, breather chamber, what the heck else? And please be honest, if I am an idiot to attempt repair to the PCV system myself, please say so. Thank you!
Usually changing the spark plugs, air filter and an oil change will fix your problems. If your oil is old, you can get the high carbon. I don't usually change the spark plug wires and I just take the distributor cap off and clean the contacts.
Posted on Nov 27, 2013
Testimonial: "Thank you so much, I'm going to try that!"
I would look at your oxygen sensor first, that is an ugly unit that is hard to get at on your exhaust manifold, this unit tells the computer if you air fuel ratio is correct, your air fuel ratio shows up in H-C PPM ; CO ; CO2 ; and NOX PPM . it screws directly into your exhaust and quite often sceized in the hardest place they can find to put it between the engine block and chassis, have fun
Posted on Nov 27, 2013
Testimonial: "thank you for the tip. I'll look that up as well."
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Posted on Jan 02, 2017
SOURCE: failed smog check
How well does the vehicle run?
Assuming that the engine did pass the EGR function test on the emission test results, and the MIL (Malfunction Indicator Light) or check engine light is not on when the engine is running, and if you are not sure when the last time it was that the engine had a complete tune-up, with distributor cap, ignition rotor, spark plugs, spark plug wires, air and fuel filters, then a complete tune-up would certainly help, and if the engine oil and oil filter have not been changed in a while, then they should also be changed before an emission test because long used engine oil traps carbon and it will show up as higher CO on the emission test because the emission analyzer will be able detect the higher CO from the engine oil through the PCV valve.
However, it would seem from those HC readings that there is a vacuum leak, and carefully inspect all of the vacuum lines for any cracks or damage, (especially the vacuum line to the fuel pressure regulator) because cracks in the vacuum lines seem to like to hide underneath the lines.
The emission label under the hood should have the vacuum line routing diagram printed on it, and the vacuum lines should all be checked to be certain that they are all connected correctly.
Here is the firing order diagram for that vehicle to help assist you tune-up the vehicle.
Posted on Jul 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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