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Thread: bmw e46 fuel trims

  1. #1
    Join Date
    Feb 2018
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    georgia
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    bmw e46 2003 sedan

    bmw e46 fuel trims

    i have very large fuel cunsomption with no eror codes

  2. #2
    Join Date
    Feb 2018
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    georgia
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    My Cars
    bmw e46 2003 sedan

  3. #3
    Join Date
    Feb 2018
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    georgia
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    bmw e46 2003 sedan
    [IMG][/IMG]

  4. #4
    Join Date
    Aug 2014
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    Lawrence Kansas
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    1,090
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    2004 325XI/2008 GL320
    Look for vacuum leaks.

  5. #5
    Join Date
    Feb 2018
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    georgia
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    bmw e46 2003 sedan
    i cheked the vacuum with smoke. there is no leaks

  6. #6
    Join Date
    Jan 2016
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    Ca
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    2001 525it
    We found a vacuum leak athe booster for the brakes and the smoke came out from under the dash when we did the smoke test

  7. #7
    Join Date
    May 2010
    Location
    Honolulu, Hawaii
    Posts
    542
    My Cars
    E30, E9, E36, E32
    Leak in fuel system? Smell of gas when parked, wet stain on the ground?
    Someone siphoning gas from the car when you're not around? Watch the gage when you shut down and when you next start.
    Smell of gas at idle? Walk slowly around the car sniffing for it, down low too, not in a windy place.
    Leaking fuel line when under pressure? Look under the hood and under the car at idle, check pressure at fuel rail after shutoff.
    Stuck pressure valve, check fuel pressure at idle and at higher rpm.
    And the number one thing: what have you done to the car lately that has had anything to do with the fuel system? Mechanic's rule, y'know...
    Last edited by Honolulu; 02-09-2018 at 03:13 AM.
    Charlie

    Your mission, should you decide to accept it, is to add value to these threads, either by pictures or by descriptions, so the next person with the same or similar problem stands on your shoulders.

  8. #8
    Join Date
    Feb 2018
    Location
    georgia
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    bmw e46 2003 sedan
    fuel does not go out nowhere... i cleaned injeqtors, changed fuel filter, air filter. the fuel pressure is abaut 3.5 bar (50psi)

  9. #9
    Join Date
    Jun 2009
    Location
    Vermont
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    30,863
    My Cars
    97 328i Vert, 98 M3 Vert
    You probably have a vacuum leak. Smoke tests aren’t always accurate. They perform that test under very low pressure. I’ve had situations where there was a split in the intake boot and it didn’t show any smoke but the high vacuum when the car was running was enough to cause thT split to open and allow lots of air to get in. Most likely culprit is the inner intake boot

  10. #10
    Join Date
    Dec 2013
    Location
    Chicagoland area
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    2,932
    My Cars
    EXOTICS
    Bank 1 only, I assume?
    That should narrow down the leak locations to be bank specific.
    "It's not how you race your car, it's how you stand by your car, you better learn that".
    Edited version-F&F

  11. #11
    Join Date
    Feb 2018
    Location
    georgia
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    My Cars
    bmw e46 2003 sedan
    in smoke test presuure was 3 bar and the intake was holding the pressure

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