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92 toyota corolla failed smog high nox at 15mph

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: Our 1991 Toyota Corolla failed

yes the cadallac converter produces nox emissions i would say the cadallac is on its way out

the caddalac is on the exuast

Posted on Jul 29, 2008

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justuscc
  • 360 Answers

SOURCE: CHEVY SUBURBAN FAILED SMOG BECAUSE OF HIGH NOX VALUES.

nox is from running lean..... its realy high temps that cause this.......... replace the o2 sensors this should cure that any more help let me know

Posted on Oct 24, 2008

  • 1 Answer

SOURCE: 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.

Posted on May 15, 2009

  • 4350 Answers

SOURCE: 83 toyota pickup failed CA smog, high NO at 15mph.

NOx is exhaust gas recirculate related, look into EGR valve function...

Posted on Oct 10, 2009

  • 507 Answers

SOURCE: i have a 1992 nissan sentra that failed the 15mph

get oxygen sensor checked,maybe get tune up see if engine is leaning off properly,could be air flow sensor,but needs sensors to be checked

Posted on Oct 30, 2009

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1 Answer

NO ppm CA. smog at 15mph too high


NOX is high coolant or engine temps
& egr issues

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I rebuilt the TBI, Changed every sensor in the truck and replaced the heads. I still cannot pass the CA smog test


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Need 92 toyota paseo to pass CA smog test ! What causes too high HC in smog test????


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Nov 30, 2010 | Toyota Paseo Cars & Trucks

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High nox fail smog test any remedies? 99


NOX is created when the internal combustion temperature gets to high.The egr system uses burnt exhaust gases to line to cylinder walls.The purpose of this is decrease internal combustion temperature therefore reducing the amount of NOX created.Would look to a possible egr malfunction usually they will trigger the check engine light but not always.The 4.3L has been known to have issues with carbon buil up in the egr and the egr pintle not open and closing properly.

Jun 07, 2010 | 1999 Chevrolet Astro

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2000 chevy s-10 2.2l engine fails smog check due to high nox at 15mph.


Possible carbon build up need to clean system depends on your mileage and condition of your engine watch also for possible bit of overheating during testing look for vacuun leaks.

Jan 07, 2010 | 2000 Chevrolet S-10

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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

1 Answer

CHEVY SUBURBAN FAILED SMOG BECAUSE OF HIGH NOX VALUES.


nox is from running lean..... its realy high temps that cause this.......... replace the o2 sensors this should cure that any more help let me know

Oct 24, 2008 | 1993 Chevrolet Suburban

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