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My 1990 honda ex wont pass smog because the no (ppm) are to high and so is the co(%) at 15 mph what can i do to fix this

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  • Honda Master
  • 75,797 Answers

Change the oil and turn tune the engine.

Posted on Feb 08, 2012

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Posted on Jan 02, 2017

thunderalley
  • 432 Answers

SOURCE: 1993 honda accord ex won't pass smog check. what

bad o2 sensor or clogged catalytic converter, several items

Posted on Sep 24, 2009

jasperoni
  • 203 Answers

SOURCE: my c220 failed smog because of high hydrocarbons at 25 mph

hc's are unburned fuel- I would change my sparkplugs and resmog it if that is the only gas that was high

Posted on Jun 01, 2009

  • 17 Answers

SOURCE: i did not pass smog

Well, if you didn't pass a state inspection, I can tell you how you may be able to work around it. Depending on state laws for car inspections.....I'll just give you an example: My fiance's car didn't pass inspection, but as long as she paid AT LEAST $200 to try and fix the problem, they HAVE to give her an inspection sticker for the year. We are in NC. Find out the law in your state, if you can't figure out the problem and need an inspection, spend the minimum trying to fix for now.....you'll have a year to figure it out.

Posted on Apr 29, 2009

  • 27 Answers

SOURCE: I purchased 1990 nissan sentra it will not pass

most likely its the O,2 sensor

Posted on Jul 23, 2010

dmsr63
  • 2050 Answers

SOURCE: My HC (PPM) WAS HIGH

An old worn out engine will have high emmisions due to burning oil. Also, with age, a catalitic converter won't burn up any fuel vapors causing high emmisions.

Posted on Sep 11, 2010

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1 Answer

NO ppm CA. smog at 15mph too high


NOX is high coolant or engine temps
& egr issues

Lots on the internet to study on exhaust gases
& the reason they fail inspection or are too hi

Mar 26, 2014 | 1995 Dodge Dakota

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

1995 Honda Civc failed Emmisions test


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

May 22, 2017 | 1998 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

2 Answers

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

I did not pass smog due to the amount measured for the hc [ppm] test read to high it reads at 711 at 15 mph and 767 at 25 mph what can i do to fix this?


Well, if you didn't pass a state inspection, I can tell you how you may be able to work around it. Depending on state laws for car inspections.....I'll just give you an example: My fiance's car didn't pass inspection, but as long as she paid AT LEAST $200 to try and fix the problem, they HAVE to give her an inspection sticker for the year. We are in NC. Find out the law in your state, if you can't figure out the problem and need an inspection, spend the minimum trying to fix for now.....you'll have a year to figure it out.

Apr 29, 2009 | Chevrolet Monte Carlo Cars & Trucks

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.

========
Change spark plugs,wires,cap and rotor if they are over 24,000 miles
========

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.

========

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

========

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.

Jul 16, 2008 | 1990 Ford F250

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