CX air flow sensor
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  1. #1
    Fellow Frogger! IE23's Avatar
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    Default CX air flow sensor

    I'm considering the idea of replacing the old Bosch air flow sensor with a new MAF, mass air flow sensor. Has anyone made this transition? Should I consider this? What changes are required to make a MAF compatible with the ECU?

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    Adrian

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  2. #2
    Real cars have hydraulics DoubleChevron's Avatar
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    No idea, given the wear in most AFMs and there incredible cost. If I ever had to replace mine, I'd probably invest the $$$ into converting to aftermarket boost/injection/AEI control (eg: megasquirst/megajolt).

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  3. #3
    1000+ Posts Greg C's Avatar
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    There is no way you can use a MAP sensor with the old ECU. The only way is to completely renew the injection control with a new mapped type ECU and associated sensors. As yours is a turbo there is added complication.

    Why do you need to. The airflow sensor is a very well engineered device, if there are problems first check the associated wiring. If it is faulty it will be cheaper to find a new one to replace it.

    I have thought of doing this myself, in the view to improving economy. I wonder how effective it would be, as in my experience is the CX is not that bad compared to modern machines in the city but not as good in the country as a mapped equipped car. EG City : Petrol C5 10.1, CX 11. Country Xantia 6.7, CX 9.5.
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  4. #4
    Fellow Frogger! IE23's Avatar
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    The orginal air flow sensor is a mechanical device with springs that requires physical contact; a moving arm slides across a tape that over use wears out causing bad engine performance consumption and reliability. A MAF measures air mass, which is variable depending on temparature, it is not mechanical so does not rely on moving parts. Replacing an ECU and assocaited equipment maybe expensive, I have no idea of cost or who could do it. This I would have to consider carefully. It might improve engine performance, consumption and reliability. I stress the word might here. I think mork63ukCGAT has replaced all on his turbo so I should ask his opinion on this.


    Adrian

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    CX25 GTI Turbo series 1 1985
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  5. #5
    1000+ Posts Greg C's Avatar
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    Well mine has done over 500,000km and is still working perfectly. Check you don't have any air leaks in the system after the AFM, the most common cause of poor running. I would check everything else very thoroughly before condemning the AFM
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  6. #6
    Member mork63ukCGAT's Avatar
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    Quote Originally Posted by IE23 View Post
    The orginal air flow sensor is a mechanical device with springs that requires physical contact; a moving arm slides across a tape that over use wears out causing bad engine performance consumption and reliability. A MAF measures air mass, which is variable depending on temparature, it is not mechanical so does not rely on moving parts. Replacing an ECU and assocaited equipment maybe expensive, I have no idea of cost or who could do it. This I would have to consider carefully. It might improve engine performance, consumption and reliability. I stress the word might here. I think mork63ukCGAT has replaced all on his turbo so I should ask his opinion on this.

    The AFM's are great in what they do, I had the two on mine sent away and balanced by bluestreak in the UK(well I am in the UK) Mine still runs on them as I haven't made the final swap over to the KDFI ems yet.

  7. #7
    Fellow Frogger! IE23's Avatar
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    My AFM seems fine, no fault that I'm aware of. Am thinking now however that a check and refresh might be worthwhile. I would like to find someone who can do this here.


    Adrian

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    CX25 GTI Turbo series 1 1985
    DS23 IE Pallas 5sp 1974
    CX25ie Pallas Auto 1984 Parts
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    CX25ie Pallas Auto 1984

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