Not quite, there is a bit more to it. https://www.gov.uk/guidance/mot-inspection-manual-for-private-passenger-and-light-commercial-vehicles/8-nuisance#section-8-2-2

Is this you posting about yourself? Or just some quote from a thread/article you have found? As I said, and posted a link to, there are protocols that the testers should adhere to. Which will not endanger your engine provided your cam belt is...

Thanks. I did say that I found the article after a search. I will however contact the station (which are very good) and address that part about their memo on reving up the engine without load, but my main question was regarding injector pump mods...

If you read the link you will see what they should be doing. "Prolonged period" is rubbish, but they do need to rev it up to the rev limiter for a short while. This is why they check with you that your cam belt has been changed according to...

This is what I found after a search - I first qualified as an MOT tester in 1985, and the diesel smoke test was introduced some time after that. I always felt that the test was flawed, and that it was totally unnecessary to rev the engine right...

I had a memo from my MOT centre last year and the said that they will run the engine at high revs for a prolonged period and could take responsibility for any issues. This did worry me at the time. Tickover was the norm once as you say. I'm...

OK. I have never done anything to mine but I have researched it, it seemed like a quick and easy job. Maybe it is trickier and more time consuming and/or awkward than I thought. Best of luck with the MOT. If the testing equipment doesn't pick it...

Thanks but as I said I'll have to see how it goes and if it fails I will return the settings. To do that on the off chance is a pain. I was just wondering if anyone else modified their pumps without MOT issues.

I am sue that would be the safest option, but I'll probably leave it and see. Thanks for replying.

Anyone assist here? I modified the injector pump (1997 300tdi) for extra power. I didn't touch the main end screw, just the star wheel lowered by ¾ turn and the collar shaved down by 2mm and top screw (pre boost) in by 1 full turn. Although...