Question about 1997 Toyota Tacoma

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Smog failure High HC's only issue

Tacoma 3.4 v6, 250,000 miles. last smog 2 years ago barely passed the low idle HC, this year it failed the low and barely passed the 25mph test? I can attach actual readinsif that will help?

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  • 118 Answers

Hydrocarbons (HCs) are unburned fuel. You may need to replace sparkplugs and wires, if this has been done or doesn't fix the problem you catalytic converter may be worn out.

Posted on Apr 17, 2014

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Posted on Jan 02, 2017

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  • 125 Answers

SOURCE: engine rough idle cold. passes smog once temp reaches thermostat

you can take apart the top section and blow out the small passage that's bellow the throttle plate.

Posted on May 01, 2009

emissionwiz
  • 76673 Answers

SOURCE: high hc

you may need replace the catalytic converter, but 1st do this, clean the throttle body and idle airbypass valve, change the oil before the retest as well, get it as hot as you can before the test, hold it at a high idle prior to the test, this may squeak you by, as a 20 year smog tech these are the thing I did, if all else fails do the cat conv.

Posted on Oct 15, 2008

fastboyz
  • 674 Answers

SOURCE: ASM 2525 NO ppm TAILPIPE EMISSIONS failure

have you had the the engine codes pulled and reset?
and if so what are your engine codes?
i dont know of any car that will pass emissions test with the engine light on.
we cure your trouble that caused your engine light to come on and you will pass your test.
later
paul

Posted on Nov 24, 2008

  • 65 Answers

SOURCE: 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?

Posted on Aug 21, 2009

nvannoy
  • 234 Answers

SOURCE: Having a problem passing a smog test on 1996 Toyota 4Runner SR5 V

NOX is produced when cylinder temperatures exceed 2500 deg. The systems in place to reduce NOX are EGR and the catalytic converter.
If the number is only slightly higher than avg then I would suggest the EGR, make sure that any vacuum lines are attached and that the diaphragm moves freely, be sure not to damage the rubber inside the EGR.
Retake smog test, if numbers still out of range replace the cat.

Posted on Jan 12, 2010

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2 Answers

I have a 1994 chevy silverado c1500 v/6 4.3 litre and failed smog for high hc levels st idle . what should i do before i take it back to try and smog? ive already done complete tune up.


as long as you have no check engine light on change oil, air filter. pep boys sells a product called guaranteed to pass add to fuel make sure car is hot when you go back for emission test cold car has high hc levels it also helps to post the hc level you tested at and the limit on your receipt hope this helps

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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.

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Are you failing because of the puff of smoke at the start ?
That is usually a sign of worn valve seals. They might not be too terribly expensive to replace if you want to save the truck.
If the failure is a general HC failure after start, try a set of Nitrode plugs. They are about $11 a piece at Jeg's. Be worth a try.

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fist i would like you to post the year make and model of the truck along with the HC ppms and NOX ppm it would be very helpful but high hc and nox can be attributed to a faulty EGR system nox is produced when the combustion chamber temperature gets too high so a small amount of exhaust is cycled back into the air stream to help cool them there are other causes but without looking at the levels its much harder to say

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Replace your oxygen sensors.
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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

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Engine rough idle cold. passes smog once temp reaches thermostat


you can take apart the top section and blow out the small passage that's bellow the throttle plate.

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1 Answer

High hc


you may need replace the catalytic converter, but 1st do this, clean the throttle body and idle airbypass valve, change the oil before the retest as well, get it as hot as you can before the test, hold it at a high idle prior to the test, this may squeak you by, as a 20 year smog tech these are the thing I did, if all else fails do the cat conv.

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