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Failed NOx very high. I have a Ford Ranger. 1994..125,000 mi

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You can cheat and add 3oz of acetone per 10gal of fuel... This will often get readings down. BUT you should attempt to find the actual cause of this as soon as possible, to eliminate any future problems.
Did anyone suggest a cause?

Posted on Jan 08, 2009

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I have a 95 grand jeep cherokee and i have failed 2 emission they say it is a the NOx is to high what would cause that?


What causes High NOX Emissions


Thousands of technicians have faced the challenge of bringing a particularly stubborn application into compliance for NOx emissions. High NOx readings are a clear sign of performance issues somewhere in the system. The question is, where?
Among the potential causes of non-compliant NOx readings are:
Misfire condition
Malfunctioning or improperly adjusted EGR valve
Failed oxygen sensor
Leak in exhaust tubing upstream of converter
Excessive carbon deposits in combustion chamber
Improper spark advance
Blocked coolant passage
Overly lean air-fuel mixture
Damaged cold air duct
Failed or malfunctioning catalytic converter
Corroded or damaged engine sensor electrical connections

Please note that while a failed catalytic converter will contribute to high NOx readings, the failure in itself may have been caused by some other upstream performance problem. In all cases, it is crucial to identify the root cause of the problem before blaming the converter.

Case Study

Oct 09, 2012 | Jeep Cars & Trucks

1 Answer

1995 ford ranger failed nox at 15mph All other readings passed.


If the Exhaust Converter is original to the truck,replace it

They only last 12 to 15 years under perfect engine running
conditions.

Also the EGR Valve has to work correctly & you can not
have any overheating issues,from anything,cylinder misfires,
coolant temp,old O2 Sensors, with 100,000 miles on them

Jul 24, 2012 | Ford Ranger Cars & Trucks

1 Answer

ASM EMISSION TEST RESULTS AT 15MPH FAILED. WHAT SHOULD BE REPAIRED?


You have to look at the exhaust gas readings

Sometimes in my State on newer cars, they don't give you that
I have to go to the MV Web site to see the report in full

A high CO would be a rich condition
A high NOX would be overheating

Then the other gases etc

Now if you want a complete manual or set of instructions
for every diagnostic procedure to correct something,
your asking far too much.

So let me know if you work on your own vehicles
If not go to a repair shop

Sep 22, 2011 | 1996 Ford Ranger SuperCab

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.

Mar 10, 2010 | 1992 Dodge Stealth

3 Answers

Failed emissions test


Hi Don,

First, thank you for asking me for my input on this. It just so happens, that I used to own a Ford ranger that had the same engine as yours. It was a 1990, but there are few changes to these model years.

Anyway, there is only one reason that your HC levels would be high. Your engine has WAY too much unburned fuel in the exhaust. The same reason applies to high CO levels. Too much fuel and/or not enough air.

Below is a link that you may find very helpful. It explains exactly what we are talking about here and also lists some of the possible causes.

EMISSIONS ANALYSIS

Incidently, when I had the same emissions failure on my truck, replacing the air filter and replacing a failed MAP sensor fixed it. - I did NOT have to replace the catalytic converter. If the numbers are as high as you listed above, you will only destroy a new converter anyway because there is obviously not enough oxygen in your exhaust system for the catalyst to function properly. Those numbers are nearly DOUBLE the allowable maximum. If the engine is running correctly and the catalyst is good, your numbers will be WAY BELOW those maximum numbers.

Please understand that I am NOT telling you to replace your MAP sensor without proper diagnosis. There are many possible causes here. Please click the link above and read the article. It will help you to understand what is going on here.

Jun 03, 2009 | 1989 Ford Ranger

2 Answers

Failed e-test in 91 ranger


change the oil just before the test and get the Cat as hot as u can.

Jun 01, 2009 | 1991 Ford Ranger Supercab

1 Answer

CHEVY SUBURBAN FAILED SMOG BECAUSE OF HIGH NOX VALUES.


nox is from running lean..... its realy high temps that cause this.......... replace the o2 sensors this should cure that any more help let me know

Oct 24, 2008 | 1993 Chevrolet Suburban

1 Answer

Emmisions?


catalytic converter most likely

Jul 30, 2008 | 1993 Ford Ranger SuperCab

1 Answer

Brakes


buen dia amigos.

Necesito conseguir el manual completro para reparacion del FORD RANGER MODELO 2000 supercab....estoy en Honduras C.A. y no logro conseguirlo, favor avisarme a mi e mail josehernandezsps@gmail.com y decirme cual es el costo del envio o en el mejor de los casos favor enviarlo por e mail GRATIS.

si es posible en español.

gracias espero

Jul 17, 2008 | 2000 Ford Ranger SuperCab

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