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Old 21st May 2018, 21:23   #1
MGR South Devon
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Default New MOT testing rules and diesels

No doubt by now most members are aware that as from 20th May there are much tighter emission limits coming into force for diesel vehicles.
A lot is to do with later vehicles with DPF systems, but there have been some changes which may well affect our MG Rover diesels.

As an MOT test station, our gas analyser was upgraded last week for the new emissions. We are now holding our breath as to how it will effect the many MG Rover diesels that we test.

At the end of last week, we tested a 75, not for test purposes, to check out a replacement cat we had fitted. We used the new emission rules and we were unable to get the car to pass. Fortunately, the MOT does not run out until Jan 2019, so the only action we took was to offer the owner a diesel fuel cleaner and hopefully that may eventually sort the problem out.


Initially, our thinking was that hopefully if a car fails, with the addition of a good fuel cleaner and a good run up the road, the problem may be resolved,
but this morning we carried out our first official test under the new rules and again we could not get the car to pass.

Before we resorted to the diesel cleaner, we did a T4 test to check injectors and did find a problem with two of them which may have contributed to the failure. We have now removed injectors, cleaned and replaced injector seals
which were leaking and hopefully this will resolve the problem, as well as changing the breather filter which was bad.

Until we have tested a few more diesels, we do not know how problematic the new emission test will be for our cars. We are going to monitor the situation to see how things go, and will be happy to let other forum members know the results of how many cars may be affected and what can be done to resolve any of the problems.

Our greatest fear is that there will be many MOT test stations that will try to write these cars off if they cannot or will not try to get them through the gas test.


Of course, this does not only apply to MG Rover, but could affect older diesels across the board -we shall have to wait and see. Will be interesting to see if our local breakers start getting more diesels in for scrap in the coming months!
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