Question about 1984 Chevrolet S-10

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Hydro carbons in the carb are running extremely high and cannot pass the smog test. What can I do to at the very least to get it to pass the smog test? I really would like to fix it completely because

My 1984 Chevrolet S-10 will not pass smog because the hydro carbons are way too high. What can we do to lower them?

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Take it out of the country and turn a huge profit selling it!

Posted on May 31, 2009

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


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oringinal carb had problems from start.

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Monte carlo running to rich


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1989 Honda Prelude, passed all smog tests except idles at 1100rpm...what's the problem?


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I failed smog test , it failed no(ppm) what can i do to get it to pass? it runs fine a there was vaccum hoese that had a hole in it and it was replaced, and it runs smooth now. i put in 91 oct. and took...


NOX is the pollutant that caused the failure, is what I gather from your post. The high NOX could be a lean fuel condition, high operating temp of the engine, bad EGR valve, excess carbon buildup in the engine. I would check EGR valve since you have checked and repaired a vacuum leak.

Jul 18, 2017 | Cars & Trucks

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I HAVE A 99 ALERO OLDS.4CYL.& IT WON'T PASS SMOG


IF DECELERATION FUEL REDUCTION SYSTEM IS NOT OPERATING, FUEL ECONOMY WILL BE REDUCED WHILE HC AND CO EMISSIONS ARE INCREASD.SEE ON MANY ENGINES WITH DECELERATION FUEL REDUCTION SYSTEMS THE PCM STOPS GROUNDING THE INJECTORS IN A SPECIFIC RPM, DURING DECELERATION.

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I got a 84 ford f 150 straight 6 300 manual. I cant get it to pass emission test . I heard that they were notaries for not passing. any good advice thanks.


Well they need to say why it failed ( unburned hydro carbons?) Check engine light on?, Visable smoke? Nitrogen oxide levels too high? If the light is'nt on and the truck runs good make sure the engine is good and warmewd up as you take it to be inspected. If you have to wait in line to be tested rev the engine at a faster than normal isel as you wait. a freash oil chage will also help. new spark plugs and any other overlooked for mileage driven services to up dated. engines that run too cool as the therostaate not leting the motor get hot enough to burn the fuel good. The air filter not being clean. turn the base idel up as high as you can drive it Ok. Maybe with these things followed it'll pass check and adjust the inghtion timing or set a little higher than stock may push this old motor to pass. Go to the test when their real busy and maybe they won't run all the tests and not catch the reson you failed this last time. Adjust the fuel mixture screw on the side of the carb to the smoothest possible idel and then screw it in till it just slows down and then turn the idel screw back up just enough to have it run at the same speed it ran smoothest at and smeel the ezhaust to see if you can smeel fuel if you can the fuel pump may be leaking fuel into the oil and it's showing up on the test.405553745.jpgThe fresh oil change may cover this as you take it to the test right after you change the oil. Ifthe oil smells like gas you know for shure but it might pass anyway if it's clean enough.

Feb 24, 2011 | Ford F-150 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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1 Answer

1992 dodge stealth failed smog test with high NOx reading at idle. passed perfect at high rpm , failed at idle. hat causes a high NOx reading?


NOX is produced when cylinder temperatures exceed 2500 f.
Your vehicle has 2 ways to directly reduce NOX, EGR system, and catalytic converter, and also the cooling system indirectly.
Take a look at the EGR system, vacuum lines, pipes, and make sure the diaphragm moves. Disconnect the vacuum line, then push on the diaphragm and plug the hole (from vacuum line) when you release the diaphragm there should be vacuum. Also you may want to take it out and give the EGR passages and EGR valve a good cleaning, with some type of carbon cleaner like carb cleaner.

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