Question about 1993 Toyota Corolla

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1993 toyota corolla won't pass nox emissions test.

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Fix the egr system

Posted on Jul 02, 2009

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1 Answer

Should the catalytic converter be replaced in 2000 toyota corolla


Yes, but only if you fail emissions testing and the car cannot be registered unless it passes test. And if not clogged and not necessary for passing I would just leave it be.

Feb 19, 2017 | Toyota Cars & Trucks

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Failing emissions testing due to high NOX (oxides of nitrogen)


I have seen several people posting emissions failures due to high NOX (oxides of nitrogen). Nox is created when the engine's internal combustion temperature gets to high.

Two reasons this can occur is improper coolant levels and a malfunctioning egr system. The egr system injects exhaust gas from the exhaust and uses it to line the cylinder walls.This in turn reduces the combustion chamber size and internal combustion temperatures. Ultimately this reduces the amount of NOX created. These systems functioning properly can be the difference in passing or failing your emissions testing because of high NOX ppm.

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Why won't my 1993 nissan D21, 2.4, pass a NO2 emissions test ? I've changed all the vacuum hoses and there are no intake leaks.


NOx ?

Egr System issue or over heating of motor

Go on a cool damp day ( to inspection ) when you get
it figured out

Aug 12, 2014 | Cars & Trucks

1 Answer

Fail smog test


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

Dec 06, 2012 | Cars & Trucks

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1986 Toyota new rebuilt motor won't pass smog at


It depends which emission you are failing on but I suspect that it is either CO or NOx. If it is NOx, then it is quite possible that you have a problem with your EGR valve or the ignition timing is incorrect. If you failed CO, you may have a dirty air filter or indeed, a bad carb, but I would need to know the actual gas and readings to be certain.

Jun 09, 2011 | 1986 Toyota Pickup 4WD

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How to lower emmissions at 15 mph


Corolla with 1.6 Liter or 1.8 Liter usually fail for NOx on the emmisions test. This is mainly due to a catalytic convertor not workign sufficiently. Also it may be a good time to tune it up also.

Mar 02, 2010 | 1993 Toyota Corolla

2 Answers

My 93 corolla will not pass emissions. What are


the first would be the car might be leaking from the exhaust change the exahust gasket and catalytitc converter then it will pass

Oct 29, 2009 | 1993 Toyota Corolla

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