Well... the method you mention will probably work. But from my point of view it's sad that you have to stress the engine unnecessary (low gear / high revs) to get it through inspection.
I was told to do the same thing, which was the reason why I complained about the test and the mot inspector.
An old trick is to adjust the throttle cable or fuel pump so that it will not take full revs!
Apart from that most of the soot is caught in the exhuast pipe and silencer so it shouldn't take much spirited driving to clean up the system.
Do you know which values you got?
My Toyota 2.2 TD from 1998 with 345.000km needed to have the test done twice. 1st showed around 3%, 2nd 1.4%. Though I can't remember the exact numbers.
The tests where done with 5 seconds in between.
I believe the limit is 2% for a turbo diesel, though I'm not sure.
Otherwise the sure thing is to physically clean the exhuast pipe and silencer, but that's a rather big task.
I would give a good run at >3000 rpm on the motorway, and a few quick accelerations.
If the test is passed then, ask him to do a 2nd.
And ak him what he thinks of the test method at the same time
Good luck...
Hi Waldo
Can you recomend any special preparation for the diesel engine before the inspection / test?
My description above is as the MoT guy told me was a way to get the vehicle through the test.
Before the first test of my Espace I did not do any preparation or repair at all, I just showed up at the MoT workshop with the car in the condition in which I collected it in Germany.
Hans