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Thread: Random misfires and running lean

  1. #1
    Join Date
    Oct 2018
    Location
    Tx
    Posts
    2
    My Cars
    2000 328i

    Random misfires and running lean

    i have a 2000 328i and have been having some issues with it... I'm getting these codes
    P1189 (fuel control bank 2 sensor 1)
    P1188 (fuel control bank 1 sensor 1)
    P0300 two times ( random misfire)
    P0302 ( cylinder 2 misfire detected )
    P0303 (cylinder 3 misfire detected )
    P0301 (cylinder 1 misfire detected)
    P0173 ( fuel trim bank 1)
    P1250 two times ( no definition)

    I have done all ccv lines and ccv
    .. lower and upper intake boot .. Cold air intake.. .fuel pump regulator and filter.. New Vamos seals and gasket .new valve cover gasket cleaned maf, throttle body,and idle air control.. The car is very sluggish at times and will jerk and spudder then it's like it snaps out of it and will start to go... But not as well as it should.. If I floor it the car kinda bogs down like I'm not getting the right fuel... IDK I'm confused I have seen so much stuff about this issue but no fix yet Any help would be appreciated

  2. #2
    Join Date
    Dec 2013
    Location
    Chicagoland area
    Posts
    4,372
    My Cars
    EXOTICS
    If it's an oiled CAI,GO BACK TO STOCK! Oil damages the MAF sensor.
    Attempt to clean MAF with CRC MAF spray cleaner.
    Check for cracked or missing rubber caps at rear of intake manifold.
    Have a smoke test of the intake performed with a professional smoke machine,
    this will locate and verify all hard to find intake leaks.

    Btw, I see no mention of the obvious-new sparkplugs or coils.
    Swap coils #1,2,3 with #4,5,6 to verify if misfire follows.
    All these are generic codes but with P1250 check fuel filter installed correctly along with FPR.

  3. #3
    Join Date
    Oct 2018
    Location
    Tx
    Posts
    2
    My Cars
    2000 328i
    Quote Originally Posted by MIKYZZ4 View Post
    If it's an oiled CAI,GO BACK TO STOCK! Oil damages the MAF sensor.
    Attempt to clean MAF with CRC MAF spray cleaner.
    Check for cracked or missing rubber caps at rear of intake manifold.
    Have a smoke test of the intake performed with a professional smoke machine,
    this will locate and verify all hard to find intake leaks.

    Btw, I see no mention of the obvious-new sparkplugs or coils.
    Swap coils #1,2,3 with #4,5,6 to verify if misfire follows.
    All these are generic codes but with P1250 check fuel filter installed correctly along with FPR.
    Smoke test was good I have a professional smoke machine and no leaks. Plugs are new as well and I have swapped coils with no change should have mentioned before.. And pump filter and regulator are all installed properly as well..

  4. #4
    Join Date
    Dec 2013
    Location
    Chicagoland area
    Posts
    4,372
    My Cars
    EXOTICS
    Test fuel pressure at fuel rail Schrader Valve.
    Test psi during idle-1500-2500-3500rpm.

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