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Thread: Help with fuel trims

  1. #1
    Join Date
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    1992 BMW 325i

    Help with fuel trims

    https://www.icloud.com/numbers/03NO4...0170731_170053 here's my fuel trims can anyone tell me what these numbers mean in attempt to fix my car


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  2. #2
    Join Date
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    Was your engine at full operating temp for that test?

    Your short term trim on both banks is 0. Normally the STFT should hover around 0 but they're never exactly 0. Long term trim on both banks is 10. That could be caused by several things. I suspect you did that test with a cold engine.

    The big question is why are you testing your fuel trims?
    Last edited by flyfishvt; 08-01-2017 at 06:33 AM.

  3. #3
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    Quote Originally Posted by flyfishvt View Post
    Was your engine at full operating temp for that test?

    Your short term trim on both banks is 0. Normally the STFT should hover around 0 but they're never exactly 0. Long term trim on both banks is 10. That could be caused by several things. I suspect you did that test with a cold engine.

    The big question is why are you testing your fuel trims?
    My car has been bogging and randomly loosing power so I smoke tested my car fixed the leaks I found and it still bogged, im getting a p1353 cylinder 6 misfire with fuel cut off and I've replaced plugs and coils, the car has a new maf the only other way it could point is fuel issues. The engine was warm when I did this


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  4. #4
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    01 E46 330i 5sp man spor
    Have you checked fuel pressure?

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  5. #5
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    If a single cylinder is the problem, perform a compression test,
    this will indicate and confirm condition between individual cylinders.
    Btw, have you tried swapping injectors? The misfire should follow the bad injector,
    that is-if-compression is equal across all cylinders.

  6. #6
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    Here is an updated one where I unplugged the maf and let it find itself and then plugged it back in so the long term numbers will be gone, 193 is where the long terms are gone. My fuel trims increase with throttle and you can see that where I revved the car up to 3000. I checked my compression and it's good on all cylinders and I don't have a fuel pressure gauge but I can rent one from a local auto parts store.


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  7. #7
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    EXOTICS
    Swap injectors#(1X6)

  8. #8
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    Quote Originally Posted by MIKYZZ4 View Post
    Swap injectors#(1X6)
    Swapped injectors problem still occurring


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  9. #9
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    Perform a cylinder leakdown test.
    Btw,e36 or e46?
    Last edited by MIKYZZ4; 08-29-2017 at 12:54 PM.

  10. #10
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    E46


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  11. #11
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    Jan 2016
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    2001 525it
    Fuel pump

  12. #12
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    Quote Originally Posted by jclausen View Post
    Fuel pump
    Changed the fuel pump last night while running better the bogging still happened once in comparison to the 5 times or so it would happen before I changed the pump, what now


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