Question about Toyota Previa

What is the meaning of a failing test with NOx(ppm)

1 Answer

Anonymous

Oxides Of Nitrogen (NOX)

Above 2500 degree engine combustion temperature
nitrogen bonds to oxygen to form NOX

The EGR Valve is supposed to allow a certain
amount of exhaust gases into incoming air to
control high combustion temperature and control
NOX

Bad Egr Valve
Engine operating too hot
Cat too cool at inspection station
Fuel mixture issues
PCV issues
O2 Sensor issues
Injector issues
Ignition issues

Posted on Jan 30, 2011

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Failed emissions high nox

check iac valve suplly or mechanical stuckup

Dec 19, 2013 | Nissan 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.

on Jun 18, 2010 | Chevrolet 1500 Cars & Trucks

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

It does have an EGR valve

Apr 10, 2013 | Cars & Trucks

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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.

Apr 10, 2013 | Cars & Trucks

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400 ppm nox at idle 202 is the limit now what

I would replace the catalytic converter.

Jul 28, 2017 | 1994 Dodge Ram

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What does emmissions no ppm mean

Google what ever your Emission Report has on it

CO or NOX

ppm ---parts per million
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Feb 17, 2013 | 1991 Chevrolet Cavalier

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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

1 Answer

Failed smog

means that the hc,co2,nox, emissions are too high, you will need the numbers in ppm on the read out to begin diagnossis

May 08, 2010 | 1995 Oldsmobile Aurora

2 Answers

My 91 Accord has failed a total of four times in two days. The converter has been changed twice in as many days. The car failed the NOx ortion of the test. The results are as follows: Test 1: Low speed...

It sounds like you need a tune up and to clean the injectors take care of all the performance issues before you even begin the smog my suggestion would be plugs and wires and 100% that it can be your O2 sensor that is why your not passing that cost about $40 to $160 at a parts store and $40 to $90 to install good luck

Sep 24, 2009 | 1992 Honda Accord

1 Answer

My 1992 Cutlass Supreme SL Olds failed emissions.

High NOX readings indicate a somewhat lean condition IE: hot exhaust. Possible causes are cracked and leaking vacuum lines or lazy oxygen sensors. If possible have a reputable garage with engine electronics scanner services check the sensor to see if its helping to create the lean condition

Apr 25, 2009 | 1992 Oldsmobile Cutlass Supreme

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What is the meaning of a failing test with NOx(ppm)

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Failed emissions high nox

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

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

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What is the meaning of a failing test with NOx(ppm)

1 Answer

Anonymous

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Attachments: Added items

Related Questions:

Failed emissions high nox

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

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

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

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What does emmissions no ppm mean

Fail smog test

Failed smog

My 91 Accord has failed a total of four times in two days. The converter has been changed twice in as many days. The car failed the NOx ortion of the test. The results are as follows: Test 1: Low speed...

My 1992 Cutlass Supreme SL Olds failed emissions.

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Failed emissions high nox

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disappear display of nsdn.w59 of toyota belta after changing new bettery.

2010 (2ZR-FXE). What are torque specs and tightening pattern for cam shaft/housing?

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