Mots: Helping You And Your Car To Be Greener

An MOT now tests diesel emissions in order to lower emissions

, to check out how efficient your vehicle is and to make sure its running at its full efficiency rate and that there are no faults with the engine. It helps you cut down your CO2 emissions and, in turn fuel costs.

As we know, fuel emissions are one of the major contributors to high levels of pollution. Diesel fuel requires less refining than petrol and creates cleaner emissions than petrol when burnt; however, if the engine is not working properly, the engine has to work much harder, in turn using more energy. The more fuel wasted, the more CO2 is emitted from your car.

One way to tackle wastage of fuel and increased CO2 emissions is by testing if your engine is working correctly. This in an MOT is called the Smoke test, which tests the level of emissions.

The Smoke Test:

Before taking a smoke test it is recommended that you keep your vehicle well maintained, that you make sure the tail pipe is damage free, have the camshaft drive belt replaced regularly and go into the MOT with a warmed up car, which has a decent amount of fuel in. The tester in preparation will also look at your MOT history and decide accordingly if it is safe to be tested or not.

First of all an MOT tester will check that the oil is warmed up before completing the test. As soon as this is okay, he will accelerate the engine from the idle position until the governor cuts in. A smoke meter will measure the level of emissions, which will be recorded. Your car will be tested first of all a maximum of three times, if the reading is unsatisfactory, he or she will then do the test another three times. The MOT tester will then come out with an overall average, which will then tell you if your car is roadworthy or not.

The Results:

If your car passes your safe to go on your way, but if not clearly there must be something faulty with your engine, which must be repaired. The passing rate for a non-turbo charged engine is less than 2.5m-1 and 3.0m-1 or under for turbocharged engines.

Although you may pass this test, there might be other reasons for not passing the emissions section in an MOT, including excessive smoke and vapour, discoloured emissions and unusual noises. All of which suggest theres a fault with your engine or its connected parts.

by: Marie Coles

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