Question about 1992 Toyota Tercel

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My 92 toyota tercel wont pass smog. The nox is to high. What could be the problem

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Any codes?

Posted on Dec 08, 2016

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Posted on Jan 02, 2017

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


Toyota had a drivability kit which replaced carb and vaccume
lines,but I would put a weber carb on it they have a great kit
32/36 dgv progressive two barrel carb runs much better
oringinal carb had problems from start.

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My Toyota echo did not pass smog high Nox what could be wrong?


Nox is created in the engine, and the hotter the engine the more Nox is created.Get your car to run as cool as you can,oil change.engine/rad flush,fresh coolant,tune it up etc.In addition a high nox number may be a sign that your catalytic converter needs to be replaced.The converter is where the nox gets neutralized. good luck

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Check your oxygen sensor, idle speed sensor & the idle air sensor your sensors wil effect. the emmision test.

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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.

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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.

Nov 30, 2010 | Toyota Paseo Cars & Trucks

1 Answer

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.

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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.

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1 Answer

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.

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