Question about 1993 Ford Ranger SuperCab

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Emmisions? I just failed my emission test for my 93 Ford Ranger. My NOx was to high. Anbody know??

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Catalytic converter most likely

Posted on Oct 28, 2008

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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

1 Answer

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

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

FORD WINDSTAR 1996 FAILED AIR CARE IN HC EMISSIONS AND NOx EMMISIONS


before you go buying a cat converter, check these 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
these items lead to a catalytic converter going bad, and will also make the test fail

Jul 19, 2011 | Ford Windstar Cars & Trucks

1 Answer

Failed emissions....high nox


Sticking egr will raise everything except nox. Bad o2 bad cat hard to give an accurate diagnosis with out checking it

Oct 12, 2009 | 1994 Lexus LS 400

2 Answers

1996 jimmy failed an emission test


Did you change the air filter. The fuel filter will have no impact on emmision's but the air filter is a very common problem.If you usually drive it at low rev.'s then before you send it for emmisions test you will need to put it in a low gear and floor it for about a mile the reason is when it is being tested the engine is reved up to around 3500 rpm and any build up of unburned fuel or oil in the exhaust system will put up the emmisions reading.

Aug 19, 2009 | 1996 GMC Jimmy

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

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