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Thread: 2014 335i high rpm hesitation.

  1. #1
    Join Date
    Nov 2018
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    Orlando, FL
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    2014 BMW 335i

    2014 335i high rpm hesitation.

    Whatís up guys,

    Hoping someone could help me identify an issue I am having.

    Car is a 2014 N55 with VRSF intercooler, charge pipe, and catless downpipe. Tuned on MHD stage 2+ on 93 octane. Car has been running perfectly fine until today. All of a sudden while at WOT from about 5200rpm-5800rpm the car hesitates. Before and after that rpm itís fine. Logs show a lot of timing corrections mainly in cylinder 4 in that rpm range which would lead me to believe it was a bad spark plug or coil pack. However, I have brand new spark plugs and coil packs. Not even a 1000 miles on them. Also, my fuel rail pressure in that rpm range dips extremely low. Normally itís around 2400-2800 in that rpm range. Today itís from 1800 to as low at 1000 in that rpm range.

    From the research Iíve done it could be anything from a bad HPFP or LPFP or bad injectors or a clogged fuel filter but I havenít seen anything concrete.

    I woud rather not have to throw money in different parts. Can anyone guide me to what they believe the issue could be?

    appreciate any help!

  2. #2
    Join Date
    Aug 2006
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    Massachusetts
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    e90 with Cobb, H&R, more
    I'd lean towards a problem with the HPFP given it's known to be a problem area and more importantly you're seeing a pressure drop in your readings.
    Scott
    fast = good
    slow = bad
    See my old Porsche here...

  3. #3
    Join Date
    Nov 2018
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    Orlando, FL
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    2014 BMW 335i
    Quote Originally Posted by teflonjones View Post
    I'd lean towards a problem with the HPFP given it's known to be a problem area and more importantly you're seeing a pressure drop in your readings.
    Appreciate the response. Do you know of any other symptoms I would be seeing with a bad HPFP aside from the hesitation I’m getting in that rpm range?

  4. #4
    Join Date
    Mar 2019
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    Southern wisconsin
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    12' vw CC, r32, f30 335
    Quote Originally Posted by CarbonF30 View Post
    Appreciate the response. Do you know of any other symptoms I would be seeing with a bad HPFP aside from the hesitation Iím getting in that rpm range?
    I'm currently having the exact same problem. I also have the same exact mods as you. Did you ever find the fix?

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