The technical control will harden again. This turn of the screw would have to be applied on the 1st of January last, but the movement of the “yellow vests” has forced the government to postpone the 1st July next. It is, this time, to measure the opacity of smoke emitted by the engines diesel (more than 60 % of the French park, 24 million vehicles). The mechanical the most ancient, devoid of the particulate filter (FAP), mandatory only since 2011, will have a hard time passing the test. For the most recent, it will be necessary that some of their components are not too dirty: the FAP, but also the valve of exhaust gas recirculation (EGR), designed to lower the level of oxides of nitrogen (NOx), which is added to the intake system.

The contamination is the bane of diesels is not circulating in urban areas, or conducting small courses, during which the engine does not have the time to increase the temperature. Two solutions can improve things. The first is to regenerate the FAP, for equipped vehicles, rolling for thirty minutes at a rotation speed high (over 3000 rpm). The second is to proceed to a cleansing of the organs clogged.

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A car on five recalée

This sévérisation related to a more strict pollution should lead to “4.5% of cross-visits compared to a little less than 1 % today” for owners of cars running on diesel, prognostic Karine Bonnet, president of the network of technical controls Dekra (1570 centres). Only 12,9 % did not exhibit any failure elemental during their first visit. But close to a car in five is already subject to a counter-visit. Recall that since may 2018, the number of failures has risen to 610, of which 470 require a counter-visit. These hardenings successive are not treasured by the professionals of automotive repair. One of the major players in the sector, in a booklet internal for members of its network, as we could see, even talk of”business opportunities related to the technical control thanks to its latest developments”. The price of one of these inspections amounted to a little less than 80 euros, with significant disparities (from 40 to 110 euros) according to the position of the centre.

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another surprise waiting for the three-year-old motorists. It is this time of the measure known as the “five gas”. These pollutants, emitted by the exhaust of our cars, are carbon dioxide (CO2), carbon monoxide (CO), unburnt hydrocarbons (HC), oxides of nitrogen (NOx), and oxygen (O2). The application of this new control was planned for this year, but it has been postponed to 2022 at the request of the centers. They argued that they were struggling to equip the new measuring devices, very expensive (several tens of thousands euros) and also very bulky. The situation does not seem to be cleared up, if one may say so, quite the contrary. “We do not yet know the process or the equipment that will be required to perform the control of the “five gas”,” Karine Bonnet.

“Instrument for the protection of the planet”

In January 1992, at its creation, the control technique has been presented by the actors of the automotive world as a safety tool, especially in the case of a transaction. The same professionals to the show today as “an instrument for the protection of the planet”. But rather they would not disdain to return to the argument for safe about a possible technical control of two-wheels, on the ground “that there is in other countries”.

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In 2015, the government Valls had tried to impose, but he had baulked at the noisy sling of bikers. They had argued, not without reason, that the accidents due to a fault condition or maintenance of their vehicles were infinitesimal (approximately 0.3 % of the total). Remains to be seen if the technical control is not going to end up creating the same anger among motorists. And blow on the embers of the “yellow vests”, owners, for many of them, of diesel vehicles rarely last generation.

lye or hydrogen

To meet requirements in terms of performance, but also to clean-up, the Diesel engines are more complex. Injectors high-tech, FAP, EGR valve became the rule. In view of a technical control, these elements can be cleaned by an injection of detergents or gases (hydrogen and oxygen). We have tested the two methods, starting with a Renault Laguna Coupé diesel $ 35,000 km.

Despite the low mileage of this vehicle, the EGR valve and the intake system were already dirty. After cleaning with soapy products, the result has shown to be effective. At idle, the emissions of CO2 go from 48 g per minute to 25 grams. This also means that the car will consume then slightly less. Lastly, we need to drain the engine, because a bit of cleaning product passing into the oil during the operation. Same good results with the process using an injection of hydrogen. It does not require any chemical product and does not require draining the engine oil after treatment.

“Catch up” on a motor

On another diesel car totaling, this time, 160.000 km, the analyses of the clean-up indicate a significant reduction of polluting emissions in the air after treatment. The values for the carbon dioxide (CO2), carbon monoxide (CO), and oxides of nitrogen (NOx) reduced, respectively by 28.3% 68,42 % and 47.5 %. The power of the engine is increased for its share of nearly 8 % (172,45 ch against 159,7 before).

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Clean injectors, turbo, valve, inlet and filter view of a control technique may, therefore, prove interesting, especially on the diesels in small vehicles, very dirty. Hence, we come to “make up” a motor, but not to save it. If it was not maintained, cleaning will not offset the wear and tear. These processes typically cost between 70 and 200 euros.

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