1999 E46 318i se fault code p0171. - Page 4

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    #31
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    Jayp07's Car Details
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    Mate the best advice i can give you at this stage is: if you have the time but not the money to keep throwing at a mechanic you have to try somethings yourself to set your mind at rest (well thats what works for me). It sounds like you trust your mechanic, thats cool but there are somethings you should be trying first to eliminate areas... Do you have your own diagnostics equipment at home ? Are you able to wipe the codes?

    The reason why i asked you to disconnect the MAF and drive your car is that you will know immediately if it feels different. My old MAF didn't come up as faulty but it was and since then that code has not come back nor has the light come on. But when i drove without it i new that's where i had to start. If memory serves me correct once i unplugged it another light came on but that didn't stop me from driving...
    2000 E46 318i Auto
     
     

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  3.  
    #32
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    Quote Originally Posted by Jayp07 View Post
    Mate the best advice i can give you at this stage is: if you have the time but not the money to keep throwing at a mechanic you have to try somethings yourself to set your mind at rest (well thats what works for me). It sounds like you trust your mechanic, thats cool but there are somethings you should be trying first to eliminate areas... Do you have your own diagnostics equipment at home ? Are you able to wipe the codes?

    The reason why i asked you to disconnect the MAF and drive your car is that you will know immediately if it feels different. My old MAF didn't come up as faulty but it was and since then that code has not come back nor has the light come on. But when i drove without it i new that's where i had to start. If memory serves me correct once i unplugged it another light came on but that didn't stop me from driving...
    Thanks dude, I know what your saying. I don't have a machine to check anything. I know its a good car though. This morning it felt like when I bought it at 62k. smooth and fast, after work slight judder and light back on. I'll ask a friend local to me to have a look over on Sat, then local Garage to sort it once pin pointed. MAF's are expensive though i'm aware of.

    So far this is what i've had done on my car in the last few months

    Jul-12 Front Ball Joint Arm replaced £222
    Jul-12 Wheel Alignment £20
    Jul-12 Pully & Fan Belt £108
    Aug-12 Coil Pack x1 £50
     
     

  4.  
    #33
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    PS If it judders and I clear the code, won't it still judder or will it adapt? sort it self out i mean?
     
     

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    #34
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    If your maf is faulty, when you run the car without it plugged in, the car will run better without power issues because it reverts back to a factory setting of air to fuel ratio.unplug the maf and take the car for a run and see if performance improves. If it improves, replace the maf.Make sure the maf is a genuine Bosch/BMW part because the cheap ones are absolute rubbish and won't solve anything!!
    Before you judge a man, walk a mile in his shoes; after that, who cares?! He's a mile away and you've got his shoes!
     
     

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    #35
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    Thanks, I shall try to get a BMW friend of a friend to diagnosis on computer. If it can be fixed roadside or at his great, if not local garage. the thing is, what ever the local garage did improved performance as it felt so much better then suddenly judder and engine light. I shall ask the BMW dude about the MAF and to test. At first the local garage thought it would be lambda sensor, running a calibration after the coil pack fitted he found it to be lazy - could the sensor cause this issue in your mind? rather then MAF - if that makes sense?
     
     

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    #36
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    o2 sensors are a common mis diagnosis regarding the P0171 code...

    most likely culprits are:
    vacuum leak
    dirty fuel filter/injectors
    mass air flow sensor
    Before you judge a man, walk a mile in his shoes; after that, who cares?! He's a mile away and you've got his shoes!
     
     

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    #37
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    Quote Originally Posted by Bmw320d se View Post
    o2 sensors are a common mis diagnosis regarding the P0171 code...

    most likely culprits are:
    vacuum leak
    dirty fuel filter/injectors
    mass air flow sensor
    Cheers, Can a Bosch computer from the local garage identify the culprit? which one is bringing the code to be fixed?
    Or is it a case of not identifying exactly what it is? but just trial and error testing etc...?
     
     

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    #38
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    PS Could the coil pack have the same effect, giving rough idle slight judder etc?
     
     

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    #39
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    trial and error, you won't be able to pinpoint it exactly without physically checking for vacuum leaks, disconnecting the maf etc. hope you get to the bottom of it soon!
    Before you judge a man, walk a mile in his shoes; after that, who cares?! He's a mile away and you've got his shoes!
     
     

  11.  
    #40
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    Quote Originally Posted by Bmw320d se View Post
    trial and error, you won't be able to pinpoint it exactly without physically checking for vacuum leaks, disconnecting the maf etc. hope you get to the bottom of it soon!
    Ok cheers, I shall do some tests and update soon hopefully!
     
     

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