Question about 1990 Honda Accord
What does no (ppm) stand for on a emissions test
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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
SOURCE: passed 25 mph emission test
When was your last tune up? I mean new plugs wires and distributer cap. have you had the throttle body cleaned if not that will need to be done as well. The cleaning is not hard or expensive but it cleans all the build up off the throttle body. Catylytic converter may also be plugged. What I would do before your test is to run the car, get it good and hot and run it down the highway while holding the gas pedal to the floor several times to get the old carbon burnt out of the exhaust system, this old carbon in the system can cause high PPM readings for the hydrocarbons. Which simply means your engine is either not getting hot enough to keep the build up cleaned out, or your not burning fuel effeciantly causing a build up. If your getting no trouble codes or lights then the chances of an electrical system malfunction are minimal. There is also the possiblity that your engine needs some valve work done if the fuel is not getting burnt properly but if you get it good and hot and run all the old carbon out of the system you have a good chance at passing the test.
Posted on Sep 15, 2011
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