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Thread: Random multiple misfires tied to gas tank level? X3 E83 3.0i 11/2004 US Model

  1. #1
    Join Date
    Oct 2016
    Location
    Romania
    Posts
    4
    My Cars
    2000 316i, 2004 X3

    Random multiple misfires tied to gas tank level? X3 E83 3.0i 11/2004 US Model

    Hi Guys,

    I need a bit of help here, maybe some of you can help me make some decision.

    I have a X3 E83 3.0i 11/2004 US Model, Check Engine Soon light is on. Car behaves weird:

    - most of the time i get "some" shudders when at idle, like once per minute a small hesitation.
    - sometimes idle is really bad, loss of power when accelerating - i just stop the engine and restart it, problems go away and behaves as i said above, i can feel it misfiring once in a while at idle.

    - if i start the engine and immediately drive away, the problem never appears
    - if i start the engine and idle it for 30 seconds, it starts misfiring and i have to stop the engine and start again in order for it to go away.

    What i noticed is that if i have a full tank, it very rarely has this problem. i can sometimes feel it, but much smaller "shudders". If i am almost empty, the car is sometimes almost undrivable, check engine light blinking, etc.

    Went to 3 different shops, (including BMW), got same errors after testing - multiple misfires, random cylinders.

    Got solutions like:
    - change all coils, all spark plugs (they were changed with new 1 year ago, problem persists)
    - vacuum problems - changed all the vacuum hoses i could find
    - valve gaskets for misfiring cylinders (but then the misfires are random - sometimes 5, sometimes 3, sometimes 123 at the same time)
    - cranckase gasket

    I have absolutely no oil spills.

    Last shop i visited told me i have to change the gas pump, because it's going bad. I asked if maybe it could be the fuel filter with pressure regulator, they said no, because i would have a persistent problem, not just sometimes.

    What do you guys think.. something like this happened to any of you? What should i start with?

    Thanks,

  2. #2
    Join Date
    Mar 2017
    Location
    PUERTO RICO
    Posts
    1
    My Cars
    X3
    Might sound weird but I had the same problem, 110k miles, added a moisture removal additive to full gas tank of 93 octane and after half a tank problem went away, could be either bad gasoline or water/moisture in tank.

  3. #3
    1st thing : search for codes. Could be as simple as a O2 sensor or maf. It's a computer, diagnose first.
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