Question about 1991 Honda Accord

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

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  • Anonymous Mar 20, 2014

    check engine came on for evaporator system but has cleared. high emission in HC and CO failing test.

  • Anonymous Mar 26, 2014

    failed HC emissions test low speed HC 392

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  • 194 Answers

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

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I rebuilt the TBI, Changed every sensor in the truck and replaced the heads. I still cannot pass the CA smog test


Check everything that is connected to a vacuum line, check the CAT and the injectors and last run a compression test.

Mar 13, 2014 | 1988 Chevrolet K2500

1 Answer

I'm barely failing smog due to high hydrocarbons.


Hi Larry, I your position I believe I would take the vehicle for a diagnostic scan and then check the read outs. There could be a problem with any one of a number of sensors but I believe you'll end up with all odds pointing at the cat. Regards John

Aug 25, 2012 | Cars & Trucks

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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

1 Answer

My 1990 chevy astro van didn't pass smog. Paperwork says it failed the following; Ignition timing: 99 ATDC. Also, ASM Emission Test Results; 15mph HC (PPM) max is 122 measured 127, 25mph max is 102...


the smog test looks like the engine is miss firing, that could cause the timing to be out of whack also, try a old fashioned tune up, new spark plugs, wires, and filters also replace the PCV valve. any time you see the NO that high suspect a miss fire.

Feb 24, 2011 | Chevrolet Astro Cars & Trucks

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Need 92 toyota paseo to pass CA smog test ! What causes too high HC in smog test????


High HC means moisture in the system. Try driving it longer then take it to the smog shop. Otherwise it could be hard like a head gasket or easy such as a PCV not functioning. Any ways you should always drive it about 20 miles before smog check, longer when the weather is cold.

Nov 30, 2010 | Toyota Paseo Cars & Trucks

1 Answer

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.


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Jul 09, 2010 | 1997 Honda Civic

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

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

Failed Smog Test Close to CA-HC Limits


You can try some over the counter solutions per say. Some of the mechanics in a bottle. They sell some products This will probably be the cheapest router. If this doesn't work then you need repairs.

Pass your emissions test.

Jan 03, 2009 | 1992 Honda Accord

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