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Thread: MOT and Emissions test

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  1. #1
    Join Date
    Mar 2016
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    Stogursey, Bridgwater
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    MOT and Emissions test

    In another post I detailed a problem I experienced with my wifes 451 Highstyle failing its MOT on the emissions test and the work I had done to try and eliminate the problem on the advice of the centre.

    The other day it passed, and the tester said that it was normal for them to take all vehicles which had were known to have emission test issues on a 10-15 minute run to warm them up before doing the emission test.
    He did this with our car and it passed with flying colours.

    My question is - is it normal/acceptable practice for testers to get the car hot before doing emissions testing, and for cars which show emissions problems to be taken for a run - or would revving in the workshop achieve the right temp level.

  2. #2
    Join Date
    Mar 2012
    Location
    Burnley
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    1,412
    The test involves sticking a temperature sensor down the dip stick hole and it has to be a minimum temperature before the test is done (IIRC that is 80c minimum). Personally I take all cars for at least a 10 mile Italian service on the way to the MOT station and get them to do the gas test as soon as I get to the MOT station and generally do not have any problems. It is not normal for the MOT testing station to take it for a ride as far as the MOT itself goes, it is just a good service for them to offer if they are prepared to do it.

    My Smart is a particularly frozen little git and takes a lot of getting to normal working temperature plus it drops down again very quickly. It's a diesel thing that has a petrol designed cooling system, far too efficient generally which is why my radiator is completely blocked off with a plastic sheet.

  3. #3
    Join Date
    Apr 2009
    Location
    Ecosse
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    3,740
    Quote Originally Posted by Mjolinor View Post
    get them to do the gas test as soon as I get to the MOT station .
    My preferred method also though if MOT tester isn't quite ready, a trip up the road and back and then straight to emissions test suffices. Not necessarily amenable to leaving car - which is why waiting during test is becoming a preferred option - if its on the menu.
    MOT tester has the right to 'test drive' though rarely invoked.

    Cats thrive on heat - the more the better. I've yet to see proper engine temp monitoring during test implemented though an MOT tester will usually persevere until the engine is pretty hot. The pre-test drive though should put enough heat into everything such that the temp doesn't decay too rapidly.

  4. #4
    Join Date
    Mar 2016
    Location
    Stogursey, Bridgwater
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    Thanks guys.

    I think the tester who failed my wifes car twice (and whose recommendations cost me over £400) did not get the temp high enough. He only 'revved' the car for 3-4 minutes in an attempt to get the emission results to change enough to pass the car.

    Now they accept no responsibility saying they did the test correctly and any 'recommndations' were purely suggestions if they were not in writing.

    So I'm down a wad and their tester gets away with being incompetent.

  5. #5
    Join Date
    Mar 2012
    Location
    Burnley
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    1,412
    If you were there when they did it and didn't see him stick the oil temperature sensor into the oil then you need to complain. He will get his hand slapped and you will get your money back unless they choose to do an independent test at a government MOT station in which case you may lose the MOT that you have.

    "Worth the risk" or "grump about it and move on"

  6. #6
    Join Date
    Apr 2009
    Location
    Ecosse
    Posts
    3,740
    Looking at the fail slips - ''coolant pipes hot'' and ''oil temp bypassed''. Sloppy. Not least because oil temp lags behind coolant temp.

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