E39 523i High consumption.

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  1. E39 523i High consumption - MAF values needed. 
    #1
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    OskiUK's Car Details
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    Hi everyone. I've recently bought car mentioned in the title (auto gb), but apparently something's wrong with it. I mean high consumption, car drains tank in a wink of an eye, average consumption 12mpg according to obc and roughly my wallet. When I bought it car was having a problem with engine breather catching dodgy air and therefore with idle revs. Since I changed it runs smoothly except being thirsty Using INPA I worked out O2 sensors are working in range 0.4 - 4.8V, heaters 80 odd percent. In my knowledge these are right. Engine load parameter is exceeded 30 times but googling for it I found out it is an INPA issue. I'm concerned about MAF but don't want to spend money if it is not necessary - on idle readings are roughly 14kg per hour, when revs are increased these are getting out of range 20, 30, 35kg/h. Does anybody know what are values for good working MAF in M52? I forgot to mention - I don't put pedal to the metal
    Last edited by OskiUK; 15-05-2012 at 00:12. Reason: Editing misleading title
     
     

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    #2
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    GL0D's Car Details
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    ... V-Power, .. then pedal to the metal everywhere. (Just my pennies worth) Give the fuel system a good clean out.

    1. 02 sensors (oxy/lambda sensors)
    2. MAF hose split (usually underneath)
    3. CCV (PCV) + hoses clogged
    4. Fuel filter needs changing
    5. Idle Control Valve might be worth a look - Easy to clean with brake cleaner.
    6. New spark plugs

    My money's on the 02 sensors and MAF hose.
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    #3
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    OskiUK's Car Details
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    3. Engine breather changed, pipes cleaned.
    4. Changed
    5. Cleaned, good shake
    6. Fitted

    So it seems like either lambdas or maf. If only I knew proper values of working maf I could definitely say it's faulty or not

    BTW. Is it worth to give redX a try?
     
     

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    Quote Originally Posted by OskiUK View Post
    Is it worth to give redX a try?
    .. Maybe just the once, to give a head-start but I reckon it's a waste of money personally. V-Power is full of detergents and cleaners so it supposed to clean out the fuel system gradually with use. I'd suggest a good half tank of that now and again, then at least you've made an effort in that area..

    My car's done over 160k now, I always use it and have no trouble with consumption issues.


    Hope you get it sorted!
    BMW E36 Touring 328iSE
    Limo Tints
    Adjustable Koni Shocks
    Air Induction
    Custom Steel Pipes
    Scorpion Box
    M3 Front
    Full Interior Black Pack
    Polished Styl. 24 M Double Spokes
     
     

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    #5
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    OskiUK's Car Details
    Model of Car:
    318i
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    Car Body Type:
    Saloon

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    I unplugged maf, did 30 miles and see no difference in consumption - 20mpg, mixed traffic, not too bad but far from good. Seems like maf is messing. If I'd known anyone I could swap maf for a while would be perfect.
     
     

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