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Thread: Trouble shooting BMW M3 S65 Fuel pump related issues

              
  1. #1
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    Trouble shooting BMW M3 S65 Fuel pump related issues

    I can't find any solid information for fuel related issues on the S65. N54, its all over the place, S65, not so much.

    I figured I would start this thread to serve as at least a starting point for people that may run into an issue down the road.

    My original code:
    2786
    Plausibility fuel pressure sensor to machanic pressure controller
    Error will cause a warning light
    Error is not currently present
    Test conditions have been completed
    Signal or value below threshold


    No real known performance issues that I noticed with it, no CEL, no limp mode, ect.


    Later as fuel demands increased, these popped:


    2722 fuel pressure sensor electr. Diagnostics
    2788 fuel pressure variance comparison at max pressure
    2796 Motor emergency programm activated


    As Mike Benvo was able to explain:

    Click here to enlarge Originally Posted by Mike Benvo Click here to enlarge
    This quote is hidden because you are ignoring this member. Show Quote
    2722:
    This happens when the fuel pressure sensor value transmitted to the DME was higher than the maximum value stored for this sensor

    You should:
    1. Delete the fault and see if it returns
    2. If it does check the plug and wiring harness at the sensor
    3. if the wiring is ok replace the sensor


    2788: This can be triggered in many different ways. It is specifically Fuel pressure, setpoint/actual-value comparison at max. pressure.

    Fuel pressure too high at maximum pressure
    Mutual deviation between specified/actual pressure > K_Sensor_OBD_Q_Max (this is the name for the max pres value set in the code)

    1. there is a test routine that can be done with the factory computer to test the system
    2. check your fuel filter
    3. check the fuel pressure sensor and wiring

    The above two faults will cause 2796 so that just means emergency program activated.

    Various people have been consulted, and the most probable cause is the low pressure fuel sensor.

    Im told that this is the part # 13537614317

    looks like this: (#20)
    Click here to enlarge
    Click here to enlarge


    It should be located here on the M3
    Click here to enlarge

    Click here to enlargeClick here to enlarge

    Looks easy enough to reach, for now. Ill update as soon as I have a new one in.



    Forward thinking tends to believe that if its not that, then it would be the fuel pump control unit

    part # 16147842024

    Click here to enlarge

    Click here to enlarge


    This is also an easy install.

    I hope noone has to deal with issues, but if you do, I hope this helps
    Last edited by LostMarine; 08-02-2012 at 08:35 PM.

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    Hm same thing as the N54 one. I think it's a large size wrench, 13/16" or 23mm needed to spin it off. Does not take much force to tighten it either.

    Or we will just swap it out when the 'other' goodies arrive Click here to enlarge

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    i need it fixed asap to do the initial testing, so if the dealer doesnt want to do it, ill do it myself.
    once thats done, we can move forward with other goodies Click here to enlarge

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    Best of luck sorting out your issues. Hopefully this doesn't become a regular thing for our cars being at a young age.

    I can't wait to see your initial thoughts on the kit! Definitely keep us posted in those "goodies" you all speak of Click here to enlarge
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    Steve...Positive news bro! LP sensor was the culprit. Did a couple of WOT runs and the car is back to normal. It is actually so much smoother and the exhaust note sound cleaner for some reasons...Better burn since there is more fuel pressure.

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    That's good to know. I should have some information later today

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    I commend your patience steve, I would have sent it to ACM or VAC already ha
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    Hope you solve this bro.
    Click here to enlarge



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    Click here to enlarge Originally Posted by bobS Click here to enlarge
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    I commend your patience steve, I would have sent it to ACM or VAC already ha
    If it wasnt a pre-existing problem, i would have been to VAC from day 1, but the possibility of it being covered by warranty+loaner car doesnt suck that bad. I have waaaay too much goin on to really care about cars right now

    Click here to enlarge Originally Posted by 0-60Motorsports Click here to enlarge
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    Hope you solve this bro.
    Thanks, im not worried, it doesnt seem to be anything major, just not a lot of info for us to search through

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    I thought you took it to the dealer?
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    It is at the dealer, that's why I didn't go to VAC.

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    What did the dealer say?
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    nothing yet, they didnt get to it on friday

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    Then I guess you have to wait until next week, bummer.
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    as long as its ready by Friday, its all good. I like beating up on loaner XI cars

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    Finally have an update, but not much.

    Dealer did all their tests, i dont have them in hand, waiting on the email.

    Still points to either the LPFS or the actual pump.

    Being me, i decided to do this myself. I paid the pittance for the low pressure sensor and took her home.

    Easy install, maybe 10 minutes
    sorry for crappy pics, it was an after-thought

    Location of low pressure sensor
    Click here to enlargeClick here to enlarge
    Click here to enlarge
    Click here to enlarge
    Click here to enlarge

    It seems to have fixed the issue, so far

    I cleared all faults and adaptations before starting
    runs much smoother on start-up. I took her out, but shore traffic and "the man" kept me from really getting on it, but car feels more spirited and alive up to about 6,5-7k rpms

    If anything comes back, i will move onto a new pump and retest.

    If everything is ok, we can schedule the dyno again, and see what she puts down on pump, then pump meth Click here to enlarge

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    Great update man!

    I'm hoping this is it! If there is anyone who is going to do hardcore testing of the supercharger, it's you!

    Keep us posted.
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    Glad you got it fixed! I hope it doesn't come back.

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    Great news! Now you can enjoy that beast.
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    Thanks gents.

    I tried going out again today to induce a limp, unsuccessful so far, but i need to get to a GT1 again to log idle FP.

    I did however fill up and turn on the methanol... Click here to enlarge

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    Click here to enlarge Originally Posted by LostMarine Click here to enlarge
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    I cleared all faults and adaptations before starting
    Bav-Tec tool?
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    Nice...hope that fixed it for good.

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    Yes, I cleared codes and adaptations with a bav tech tool.

    The lpfs seems to have fixed the issue. Idle is more smooth, an no sensor codes as before.

    I am probably going to stop by VAC this week just to double check fuel pressure with the GT1

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    Click here to enlarge Originally Posted by LostMarine Click here to enlarge
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    Thank you!
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