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1991 honda wagon failed emissions co test - 1991 Honda Accord

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Change the cat. Adjust the timing.

Posted on Jun 24, 2009

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1991 TOYOTA CRESSIDA FAILED CO AND NO ON EMISSION TEST WHY?


Most likeley is that your cat is broken /burnt out or old or simple thing being is that you o2 sencor is shot easy fix just buy new one and watch a video on how to replace o2 sencor

May 02, 2014 | 1991 Toyota Cressida

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I failed Emissions Test: 15mph: HC - (max 66) 150


go to autozone and have them look and the check engine light and that will help you figure it out. they should also give you a piece of paper that will tell you what is wrong take that to an auto mechanic and ask his opinion

Oct 28, 2013 | 1997 Honda Civic

2 Answers

1995 Honda Civc failed Emmisions test


Emission test by codes reader? or smog? Any codes?

May 22, 2017 | 1998 Honda Civic

2 Answers

My 1997 Honda Civic failed it's Emissions Test. See below the ASM Emission Test Results. What do you suggest I do to get the car to pass the smog test? ASM Emission Test Results: 15mph - RPM = 1587...


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.

Apr 05, 2011 | 1997 Honda Civic

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I own a 1991 volvo 940 turbo.it failed emissions test ,it failed on two things and passed on the third thing


what were the specific inspection details like Co, 02, CO2 and NOx readings?

furthermore, have you done any maintenance like fuel filter, oil change and spark plugs?

Sep 21, 2010 | 1991 Volvo 940

1 Answer

1991 Honda Accord LX failed EVAP test. The ASM Emission Test Results showed Test 25mph RPM 1933, %C02 MEAS 14.60, %02 MEAS 0.22, HC (PPM) MAX 61, GP 236, MEAS 19, CO (%) MAX 0.60, GP 2.10, MEAS 0.02, NO...


Things to consider or replace...

If you are getting a Check engine Light let me know, it will make things easier to diagnose.

Catalytic Converter
Oxygen Sensor
EGR Valve

May 17, 2010 | 1991 Honda Accord

1 Answer

91 ACCORD FAILED EMISSION TEST FOR TO MUCH CO TWICE AND GETTIN HIGHER THATS THE ONLY THING FAILING


High CO means too much fuel in the mixture. Try replacing the O2 sensor. If your check engine light is on, you might a have a bad MAP sensor on the intake manifold (have to pull the code to make sure). Replace the air filter too. Also good idea to replace spark plugs (and/or PROPERLY GAP THEM) and change the oil.

Mar 30, 2010 | 1991 Honda Accord

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MY 1992 HONDA ACCORD WON'T PASS THE EMISSIONS TEST


if it's slightly above the limit.. you could try putting in premium gas or an octane additive as that will lower your emissions slightly..

Sep 11, 2009 | 1992 Honda Accord

1 Answer

My 1991 4runner failed emissions test with high CO and HC levels.


Not sure, but did you replace the oxygen sensors. Is your catalytic converter still good?

Aug 21, 2009 | 1991 Toyota 4Runner

1 Answer

1991 Honda Accord LX failed emission test on smog test. High CO and HC on 25mph


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.

Mar 07, 2009 | 1991 Honda Accord

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