getting a diesel through an MOT

step one thrash the life out of it to clean out exhaust

step two if you can find the boost pipe going to the fuel pump and crimp it or take it off the fuel pump as it will cut your boost fueling meaning you run way too lean meaning you get a nice clean exhaust
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P.Allison fixer of big engines Mk2+Mk2a signed by God / Hacked by the Lord Aberdeen Scotland