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Thread: M54b25 pulls stronger when cold

  1. #1
    Join Date
    Mar 2021
    Location
    Spain
    Posts
    3
    My Cars
    325i e46

    M54b25 pulls stronger when cold

    I recently bought a nice 325i, i replaced vanos seal and i did all oils. The car pulls stronger at low revs when cold, and it idles perfectly, once it warms up, it becomes a bit more slugish and really easy to stall. I have disconected the maf and it did make no difference in cars's behaviour. Thank you

  2. #2
    Join Date
    Jan 2005
    Location
    Japan
    Posts
    54,654
    My Cars
    11/88 E32 750iL+98 E36M3
    check the temperature sensors for coolant and air.
    Best is you get a fault code reader, much easier to find fault codes on the E46
    Shogun tricks and tips for the E32 series are HERE!

  3. #3
    Join Date
    Mar 2021
    Location
    Spain
    Posts
    3
    My Cars
    325i e46
    Quote Originally Posted by shogun View Post
    check the temperature sensors for coolant and air.
    Best is you get a fault code reader, much easier to find fault codes on the E46
    I have already checked for codes and nothing

  4. #4
    Join Date
    Jul 2011
    Location
    Arlington, VA
    Posts
    9,933
    My Cars
    2018 BMW M240i
    Get the OBDFusion app for your smartphone or tablet. Buy the appropriate interface adapter that plugs into the obd2 port under the dash. Search this forum for a thread on the app written by Balidawg. Check the following separately when the engine is operating properly and then when it’s less powerful:
    MAF (grams/sec at idle and 2000rpm)
    Long term fuel trims (LTFT)
    Short term fuel trims (STFT)
    Intake air temperature (IAT)

    Buy/borrow a fuel pressure gauge. Remove the plastic cover on the top of the engine and attach the gauge to the fuel pressure test valve (looks like a tire valve) on the fuel rail. Item #2 in the link is the cap for the valve. Pressure if as to be at least 50psi at all engine speeds and loads.

    https://www.realoem.com/bmw/enUS/sho...diagId=13_0900

  5. #5
    Join Date
    Mar 2021
    Location
    Spain
    Posts
    3
    My Cars
    325i e46
    Quote Originally Posted by MarcoZandrini View Post
    Get the OBDFusion app for your smartphone or tablet. Buy the appropriate interface adapter that plugs into the obd2 port under the dash. Search this forum for a thread on the app written by Balidawg. Check the following separately when the engine is operating properly and then when it’s less powerful:
    MAF (grams/sec at idle and 2000rpm)
    Long term fuel trims (LTFT)
    Short term fuel trims (STFT)
    Intake air temperature (IAT)

    Buy/borrow a fuel pressure gauge. Remove the plastic cover on the top of the engine and attach the gauge to the fuel pressure test valve (looks like a tire valve) on the fuel rail. Item #2 in the link is the cap for the valve. Pressure if as to be at least 50psi at all engine speeds and loads.

    https://www.realoem.com/bmw/enUS/sho...diagId=13_0900
    Thank you, i didnt relaized about the fuel pressure rail. I will search on the forum for a proper disgnostic tool. Thank you very much

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