Question about 1993 Subaru Justy

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High NO Level During Emissions Test

My NO level was over 1000 ppm at the 15 mph part of the test but about 700 at 25 mph - why? Iread that retarding the timing would reduce NO emissions. Mine is at 6 BTDC with a spec of 3 to 7. Any suggestions on getting my wife's pride and joy to pass?!?

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Try a new cat converter and you should be good to go

Posted on Jul 19, 2008

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What does it mean when it says co


CO? That means Carbon Monoxide - it's a rather toxic and poisonous gas emitted from the exhaust system.

When they check emissions on cars CO is one of the gases they measure. If the level is too high .. your car fails the emissions test. I believe in the USA the emissions test is known as the 'smog test'?

If you have a problem with excess CO emissions on a car the cause is often an incorrect fuel/air mixture or a faulty sensor called the lambda/oxygen sensor in the exhaust system

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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.

on Jun 18, 2010 | Chevrolet 1500 Cars & Trucks

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Why would my car not pass Georgia Emissions testing?


Can you remember how many miles you have driven since the engine was installed? What I mean is that if you have a good running engine and have a new converter, sometimes the easiest things are the ones overlooked. Check your air filter to make sure it isn't dirty and restricting air flow. Also check your spark plugs to see what kind of shape they are in and if they are burning clean. Spark plugs can tell a lot. If you had transfered any emission related parts from the old engine to the new, maybe one of those items has an issue or is clogged. I hope this helps. Good luck.

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1 Answer

Failed NO ppm


probably needs a cat.

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My 1989 Mercedes 260E has no EGR valve and CA emission test failed NOX. What's next?


You engine came with EGR, here is a picture of it, make sure it is functional.808daddd-23be-456e-979e-50a2188da73b.jpg

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My 95 Lincoln towncar failed smog due to high nox at 15 mph


Your EGR is plug or is non operational,When the EGR is not plug and is in operational its job is to cool the combustion chamber thus lowering Nox.

Mar 29, 2012 | Cars & Trucks

1 Answer

Lowering the HC ppm reading for emissions


change the oil just prior to test, run the engine at very high idle just prior to test to super heat Catalytic converter, this will lower reading as much as 100 PPM.

Aug 14, 2009 | 1989 Subaru DL

1 Answer

Emissions level HC (PPM) too high in truck. How to fix?


Do an oil change with 20W50 oil (or one grade higher) to prevent blow by during the test.

You current oil has HC from blow by though the rings.

Do a fresh oil change will lower the HC.

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Change spark plugs,wires,cap and rotor if they are over 24,000 miles
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Make the smog check appointment for the EARLY MORNING. Colder air will help the fuel burn better.

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Clean or change the air filter and pcv valve.

Clean Mass Air Flow sensor with CRC Mass Air flow cleaner or electronic part cleaner.

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Do a quick wipe down on the wires and cap to take the moisture off.

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Check spark plug wire contacts for corrosion.

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Fill the tank to around 3/4.......just in case your fuel pump is weak.

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Ran the truck for 20+ minutes on highway before the test.

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Do not carry excessive cargo on the truck bed.


These are the little things I would do to get the HC and CO down.


Please post more information on the comment window.

Jul 16, 2008 | 1990 Ford F250

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