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Thread: E46 320d misfire and low boost between 1200-2000rpm

  1. #1
    BMWHaus Contributor
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    E46 320d misfire and low boost between 1200-2000rpm

    For a while I've notice like misfire between 1200 and 2000 revs

    I think it happens after I changed air filter. Maybe coincidence.

    I blanked the swirl flaps. I've changed the gaskets on manifold.

    It is low on boost according the INPA desired and current values.

    No errors on INPA.

    Not sure where to look now.

    I've ordered vacuum pipes to change all of them but not sure if this will help- hopefully will.

    It's 2004 car eu4

  2. #2
    BMWHaus Contributor
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    Is the MAF will give this ?

    I read this will affect the performance under 2k. This happened after I change air filter

  3. #3
    BMWHaus Guru
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    Air filter sitting in correct against the maf?

    Even if it isn't, shouldn't really give a misfire


    Sent from my iPhone using Tapatalk

  4. #4
    BMWHaus Contributor
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    It does. I've checked today.

    I'm reading now that the faulty MAF will gives hesitation and low power under 2k.

    As this happened just next day I changed the airfilter and the old one was black.

  5. #5
    BMWHaus Contributor
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    Quick update.

    I've unplugged the MAF (which brought the engine light) and car drives better.
    Better acceleration until 2k and no misfire feeling. Idle revs steady no up or down.

    I think this is the problem. I'll try cold engine later on.
    When I started car this morning the revs were going up and down slight when cold.

  6. #6
    BMWHaus Contributor
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    So. Update.

    I put new MAF and actually don't think made any changes.
    I cleaned MAP and I think this made the difference. Less hesitation that's for sure.
    Maybe is on the way out I'll check with INPA the values if bad I'll replace this as well.

  7. #7
    BMWHaus Contributor
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    Not sure if anyone is reading this, hopefully someone can help me at some stage.

    So today I unplugged the vacuum pipe from EGR and blanked it.

    Car definitely drives better until 2-3k with good pull and without hesitation.

    I tried to push on 3rd gear above 3k and looks like lack of boost. Maybe there is a leak somewhere or egr is always open.

    Not sure where to look. My MPG dropped a lot

    If someone has an idea feel free to comment.

    So far I've changed MAF for Bosh one and cleaned MAP ( which made slightly better - maybe is broken?) how to check in INPA ?

    Anything else I need to check?

    Unplugging EGR made big difference below 3k.

  8. #8
    BMWHaus Contributor
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    So. After unplugging the EGR car become worst. Lack of power. Also I've got those errors





    Anyone could point me out what they mean ? Is those errors are related to MAP ?

  9. #9
    BMWHaus Contributor
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    I've ordered new MAP - Meyle.

    I hope this will help

  10. #10
    136 or 150 bhp?


    19\G/48

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