2004 E46 320D - Maf sensor

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  1. 2004 E46 320D - Maf sensor 
    #1
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    jordan1990's Car Details
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    Hi, I'm new tp the forum and new to a BMW, I've always wanted an E46 and a couple of days ago i brought one.

    Before i bought it the dealer told me the MAF sensor had just been changed because it was faulty. When i test drove the car it was fine.
    On the drive back (Where i bought it from was about 60 miles from where i live) it started to cough or seemed like a misfire while cruising at about 80mph.

    Today i discovered its doing the same thing while I'm trying to accelerate (When i get past about 2000rpm, before 2000 it seems fine)
    The idle is fine and never misfires when idling, but i can sit there and just rev it and again after 2000rpm it stutters and misfires.

    But if you keep your foot down it gets past the misfire range and revs onto 3000rpm and upwards fine. Its only within that specific rev range it occurs.

    As the dealer is quite a way from me i toke it to a local garage who did a diagnostic and found the MAF sensor readings are way off what they should be.
    They said the new MAF thats been put on is a cheap jack aftermarket one, so it could either be that, or the wiring in-between the MAF and the ECU.

    So the dealer is paying for me to get a proper bosch MAF sensor as a replacement, i can either fit it myself or drive the 60 miles back to him to have him do it.
    I am capable of fitting it myself, however i would rather a proper mechanic so it and test it again and make sure all is well.

    Is it possible that one of these cheap aftermarket MAF's could fail that quickly? I mean it can't have been on there for more than 50 miles. Or is it possible its something more serious?
     
     

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    edber's Car Details
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    The cheap mafs don't meet the requirements of the ecu,therefore the ecu will be getting the wrong readings from the maf sensor.
    Fit the new bosch maf yourself(its very easy to do)and you should be fine unless the car has other issues.
    A maf sensor is one of the most important items that you cannot scrimp on.
    No need for testing when you fit the new bosch one as the difference of a properly working maf will be apparent straight away.
    Your car will thank you.
     
     

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    jordan1990 (22-11-2013)

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    #3
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    Thanks for your reply, does it take long to fit?

    Im hoping to god it does fix the problem! I love the car so far and I've only had it 48 hours, its the first decent car I've ever had, just want it to be running properly.
     
     

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    When you say the car started to cough or misfire,was this during heavy acceleration?
    Takes only about 15 minutes to change.
    5 if your good and have done it before
     
     

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    No just normal acceleration.
     
     

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    Get the proper maf on and then the misfire should be gone.
    A out of spec maf will cause all sorts of problems.
     
     

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    The guy fitted the bosch MAF today, he told me to take it for a test drive and at first, it was no different, but after about a mile the problem completely went away and the car was fine.

    Until i turned it off and started it again, it started doing it again just not as bad. And then the EML came on, and the guy said thats to be expected, so he plugged his snap-on solus thing into it again and reset it and the light went off. He explained to me that the ECU will "Learn" the new MAF after a while. He said it could take a couple of hundred miles of driving, so far I've done 70 but thats all been at one speed on the motorway. However the EML has come on again this afternoon when i popped out to the supermarket with this same "stutter" to the engine when i accelerate, strangely if i accelerate hard from the start through all the gears and give it a thrash it doesn't do it. It seems to be worse when you accelerate at a normal pace. I am hoping to do a bit of up and down the gears town driving and hope what this mechanic says is true and it will sort itself out.
     
     

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    He is correct in saying that the ecu will need a bit of time to ADAPT/RELEARN.
    You could try and disconnect the battery for a while,say 30 minutes and then reconnect and see how the car behaves then.
     
     

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    Ok thanks ill try that, will the EML light go out eventually once its working correctly or am i going to have to find someone with a diagnostic machine to plug it in and turn the light off?
     
     

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    This may sound ridiculous but i cannot for the life of me get the black tray off to get to the battery! Taken the 2 plastic holding things off but it will not budge, its held on against the carpet with something.
     
     

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