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Failed smog with hc and nox too high but co it's fine what I should to do to decrease thos numbers?

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  • Jose
    Jose Mar 30, 2015

    I'm sorry, I have a 88 Mazda b2200

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  • Cars & Trucks Master
  • 2,474 Answers

Did you start with a basic tune up ? plugs, air cleaner ?coil ? on what ?is your catilatic convertor good ?

Posted on Mar 31, 2015

Testimonial: "Steve thank you for your recommendation which yes I did already, should I take it to retest now?"

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1983 Ford Ecoline 150 /6cyl. Failed smog/ Egr numbers were too high How can i fix this to pass smog


Other than testing the EGR valve, not many options. You really need a 4 gas analyzer to know what is coming out of the tailpipe. Otherwise you won't know if repairs have helped the problem.
When you say EGR numbers I'm not sure what you mean. Most of the time the test is for CO and HC gases, along with oxygen and Nox also in some areas. The EGR valve allows some exhaust gas to be recycled thru the engine and reburned. CO or HC could be high if the EGR system is not working.

Feb 06, 2015 | Ford Cars & Trucks

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.
You can reduce both NOX and CO emmissions by adding denatured alcohol to the gas tank. Run it down to a bit under 1/4 tank and add 1 1/2 gallons. It makes the engine run a bit rough, but really clean.
If you still fgail SMOG then you need a new catalytic converter.
I used to "trick" my 86' with alcohol, but just rebuilt the engine so I put a new Cat on it. It passed emissions with WELL BELLOW numbers.

Good luck.

Aug 08, 2014 | 1991 Toyota Pickup

1 Answer

Failed MEAS


wow, no context but i can read your mind?
ok SMOG failed. right?
what speed, there are 2 in uSA, 15 and 25.mph.
so there are 3 tests, which one. all are PPM in usa.
parts per million.
but is that HC , CO, or NOX? or ?

based on your numbers is HC
hydrocarbons or in barstool, its raw gasoline leaving rear of car.
unburned fuel..

572 ppm is way too high 12-19 is normal
id say the CAT is bad.
but can be , engine is bad, and burned out the cat.
that is why all savvy mechanics, check the that the engines
holds closed loop status, (EFI closed loop) at the speed yours failed.
if not in closed loop the cat will burn up (rich)
that is first.
Once that is cured. you check HC again. if out of spec
you did burn up the can , new cat time.

that is the correct way.

Feb 19, 2014 | 1998 Toyota Tacoma

2 Answers

Smog test failed nox too high 91 chevy camero v6 170.000mi


If the plug wires are original replace them with a quality set and also do the plugs. If the car still fials you will need to replace the catalyst.

Aug 21, 2013 | Cars & Trucks

1 Answer

C15001993 truck 4.3 v6 Failed Emissions HIGH CO again


Sounds like you lost O2 Control

Check fuel trim & data with professional
scanner & such

You done as far as working at home, you did all
you can

You have a rich condition (CO)

Seems as though the coolant sensor is not working &
your in open loop

Mar 05, 2013 | Chevrolet C1500 Cars & Trucks

1 Answer

Failed smog


means that the hc,co2,nox, emissions are too high, you will need the numbers in ppm on the read out to begin diagnossis

May 08, 2010 | 1995 Oldsmobile Aurora

1 Answer

Failed emissions....high nox


Sticking egr will raise everything except nox. Bad o2 bad cat hard to give an accurate diagnosis with out checking it

Oct 12, 2009 | 1994 Lexus LS 400

1 Answer

1990 Dodge Dakota Smog Issue


Question

PPM of Nox or Co or HC?????


The base of the EGR and the EGR air passage tube will collect carbon over the years.

Most car over 65,000 will fail Nox and has high CO because of the partly block passage.

The only way to clean to the air passage tube is with a lot of WD-40 or similar cleaner.

The EGR valve can be clean or replace under $68 ////gasket for around $3.

Make sure there is NO LEAK when you put the EGR valve back in place.


Please post what PPM is failing on reply.





Jul 06, 2009 | 1996 Dodge Caravan

2 Answers

Emissions failing with high NOx


Change the lambda/oxygen sensor in the exhaust.

May 21, 2009 | 1994 Mitsubishi Galant

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.

Mar 17, 2009 | 1992 Mazda Protege

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