Question about 1992 Toyota Paseo

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Passed 2 of 3 emissions, failed HC(hydrocarbons)got 241, 200 needed.) 7 points better after new air filter, plugs, PCV. (Already changed oil.) High miles but runs great, no oil loss, no exhaust smell. Thank you.

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With that many miles, the catalayic converter on the exhaust is most likely worn out and needs to be replaced.

Posted on Oct 02, 2009

  • cmcgarva
    cmcgarva Oct 02, 2009

    with that many miles, the catalayic converter on the exhaust is most likely worn out and needs to be replaced.

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1 Answer

Failed emissions hc high


First I recommend changing spark plugs, air filter, and change the oil & filter. If these are dirty or fouled up it will kill your millage and help to fail smog.
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If you still fgail SMOG then you need a new catalytic converter.
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My 88 buick limited wont pass smog hc is 169 at low idle changed map sensor and oil still wont pass but car runs fine.


Are you burning oil? Does this car still have a catalytic converter? Have you changed spark plugs or air filter recently. There are many causes for a high hydrocarbon reading: burning oil due to rings or valve stem seals; catalytic converter malfunctioning or missing; vehicle in need of a tuneup or air filter replacement. Poor combustion results in high hydrocarbon levels. Good luck with it.

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I'm barely failing smog due to high hydrocarbons.


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High HYDROCARBONS on emissions test. I have took my 97 Cabrio to emissions test and failed due to High Hydrocarbons. but states the Catalytic converter is fine. what eles could cause high HC levels?


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first thing to do is change the air filter. even if it appears clean, the airflow can be blocked enough to affect the petrol air ratios in the engine which will give high HC readings.
changing the spark plugs can give a cleaner spark, and better ignition, with lower HCs. high HCs could also be caused by traces of oil getting through worn piston rings and valve stem seals and burning in the combustion chamber. there are many oil additives that can help stop this and reduce HC levels as well.
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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.

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1 Answer

Failed smog


We had to have the calatic converter replaced. We did this after doing an oil change, air filter change, and new spark plugs and still hadn't passed smog. After changing the calatic converter it passed smog with scores of 25.

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1 Answer

High Hydrocarbons cant pass emmissions test 1994 Jeep 5.2L. I changed plugs, oil, PCV valve, temp. sensor. oil filter. Truck has 112000 miles. Engine runs very strong. I lowered the fuel by regulating the...


If you changed the battery or it went dead before your test ,it reset you history you will have to drive it a couple of weeks to update you emission control module then have it retested

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1986 camaro emissions problem- 6 cylinder stick


high hydrocarbons indicates head gasket(1 or both) leaking , carbon monoxide is a worn out catylitic convertor which both could lead to the oxy sensor getting a false reading

Oct 28, 2008 | 1986 Chevrolet Camaro

1 Answer

Emissions level HC (PPM) too high in truck. How to fix?


Do an oil change with 20W50 oil (or one grade higher) to prevent blow by during the test.

You current oil has HC from blow by though the rings.

Do a fresh oil change will lower the HC.

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Change spark plugs,wires,cap and rotor if they are over 24,000 miles
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Make the smog check appointment for the EARLY MORNING. Colder air will help the fuel burn better.

========

Clean or change the air filter and pcv valve.

Clean Mass Air Flow sensor with CRC Mass Air flow cleaner or electronic part cleaner.

========

Do a quick wipe down on the wires and cap to take the moisture off.

========

Check spark plug wire contacts for corrosion.

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Fill the tank to around 3/4.......just in case your fuel pump is weak.

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Ran the truck for 20+ minutes on highway before the test.

========

Do not carry excessive cargo on the truck bed.


These are the little things I would do to get the HC and CO down.


Please post more information on the comment window.

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