Question about 1995 Ford Contour

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Improper fuel combustion; need to pass emissions test

I just had my 95 ford contour Lx emissions test done. It failed the carbon monoxide part of the test. They informed me that I have improper fuel combustion. Is there any way I can fix this problem so I can pass the emissions test?

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  • Lee Glascock May 11, 2010

    is the check engine light on?

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Sounds like you need to replace your oxygen sensors.  If you have a four cylinder I think you only have one oxygen sensor and the six cylinder I know has 2.  You can check that out at your local parts store.  Anyway, the oxygen sensor helps the computers in your car make sure that you are getting the correct amount of fuel and air during combustion thus controlling your emissions.  I would think that if you haven't replace these in a while that is what is probably keeping you from passing your test.  Change the oxygen sensors and put a bottle of good fuel injector cleaner in a full tank of gas and you should be good to go.  I would suggest Greased Lightening fuel injector cleaner that can be purchased at Napa and O'Reilley Auto Parts.  Let me know if you have any other questions.  Thanks for an honest rating and for using FixYa!

Posted on May 24, 2009

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Yeah...asssuming you havent used ur 30 days yet. 7 days before your next test add in a can of Octane boost into ur car...you can get it from your local auto store. Also Fill up with the best Premium gasoline and drive the car 100 miles. Then on the day of the test, add another can of Octane boost to ur fuel tank. Make sure you've had a recent oil change too AND your car must be at normal operating temperature before the test.

Posted on May 24, 2009

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Only a few general concepts, keep in mind that the exhaust gas recirculation (EGR) valve is an integral part of a vehicles emissions control systems. It operates under the premise of lowering combustion chamber temperatures to reduce the amount of pollutants created by the combustion process. Being closely tied to the combustion process, this valve's operation has direct effect on the overall performance of the engine. Poor or faulty operation of the EGR valve can result in several notable symptoms and leads to increased pollutant emissions.

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Test cylinders compression and check if some fault code is stored in the PCM 9computer).

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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.

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Failed oxygen sensor
Leak in exhaust tubing upstream of converter
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Improper spark advance
Blocked coolant passage
Overly lean air-fuel mixture
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