Question about 1991 Toyota Cressida

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TOYOTA CRESSIDA FAILED COAND HC SMOG TEST

FAILED SMOG TEST HIGH CO AND HC

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 1861 Answers

SOURCE: failed smog test hight high

Bad injectors.

Posted on Sep 08, 2008

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emissionwiz
  • 76164 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

  • 2309 Answers

SOURCE: failed emission test 1997 toyota corolla hc and co

running too rich, probable causes spark plugs, pcv valve malfunction, leaking injectors, vacuum leak, catalytic convertor, o2 sensor,

Posted on May 12, 2010

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1 Answer

93 toyota tercel failed smog due to high hc. Passed all other co and no ppm. PLease help


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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.

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Why does my car **** and hesitate and has failed smog 2X is now a gross polluter ?


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Smog failure High HC's only issue


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I'm barely failing smog due to high hydrocarbons.


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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.

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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

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


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.

Mar 07, 2009 | 1991 Honda Accord

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.

Oct 08, 2008 | 1997 Toyota RAV4

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