Bmw diesel Mini Cooper - new maf still got issues ?

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  1. Bmw diesel Mini Cooper - new maf still got issues ? 
    #1
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    benlg81's Car Details
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    Hi

    I have had a constant flat spot on the diesel cooper so far I have replaced

    Thermostat and temp sensor
    Air filter
    Turbo seal
    Charge pipe
    Dpf delete + remap
    Today -maf

    Right with the old maf unplugged the car drives lovely no flats spots no smoke just a joy to drive

    With the new and the old maf connected there is a flat spot mainly in second gear along with a lot of black smoke

    I have re checked everything is air tight and also unplugged battery for 30 mins and then went into the secret menu on the software to do a ecu reset

    I have only driven 10 miles but still got the second gear flat spot


    Any ideas on what might be the issue

    Any ideas ow long the mini ecu takes to re learn and stop over fuelling ?
     
     

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    #2
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    Vista's Car Details
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    As unplugging the MAF puts the ECU to a default setting and it all runs fine, I'm going to bet on the remap being the issue. Or did this problem exist before you had it remapped?
     
     

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    #3
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    There was always the issue with flat spots.

    That's why we had dpf delete and remap as the tuning company said it was excessive back pressure from full dpf

    The smoke is a new thing really
     
     

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    #4
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    smoke will be because you've removed the DPF, it's what the DPF is designed to filter out. It may have been present before but the DPF was masking it.

    I'm also sceptical that the DPF would cause a flat spot at a particular point of the rpm range. It's either clear or it isn't, and if it isn't you'll get a warning, excessively blocked and the car will go into limp mode until it's fixed. Did you ever get the fault codes checked?
     
     

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    #5
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    I've checked codes and nothing on their now.

    The company that did remap and dpf delete said it had fault code excessive pressure from dpf.

    The flat spot before wasn't as bad as it it now with new maf on.

    Just don't understand how without it plugged in it works perfect
     
     

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    #6
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    where did you get the MAF from was it a cheap one or OEM ?
     
     

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    #7
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    Hi

    Just replaced the maf with the old oe mini one and it runs good no over fuelling no smoke just a tiny flat spot but liveable

    The new one is a cheapish one from euro car parts all the same codes on it but one thing not right with it.

    What would happen if I had the car mapped with a semi failing maf would it affect the map?
     
     

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    #8
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    Quote Originally Posted by benlg81 View Post
    The new one is a cheapish one from euro car parts all the same codes on it
    very rarely do the cheaper sensors work ok best to spend the extra and get a OEM one
     
     

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    #9
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    Cheers ill take it bak tomorrow

    Is it best for bmw mini or are the pierburg any good ?
     
     

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    #10
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    Quote Originally Posted by benlg81 View Post
    are the pierburg any good ?
    same quality as the OEM
     
     

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