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fuel trim

  1. 2003 330xi - E1 - Aftercat fuel trim system Cyl #1-3 (Bank 1, Post Cat) | P 2096

    E46 Xi Forum
    2003 330xi - E1 - Aftercat fuel trim system Cyl #1-3 (Bank 1, Post Cat) | P 2096 Hi everyone. I'm currently getting this elusive code. I've done the intake books and O2 sensors post cat. DISA valve was redone with the aluminum kit. I have on order the fluorosilicone ring for the DISA valve. I...
  2. Issue with fuel trim and rough idle when warm

    General E46 Forum
    Hello! I recently did a swap from b25 to b30. But since the first start the car have been running rough... in idle you can feel the multiple misfire and the fuel trims are super lean and rich, bank1 28% and bank2 -28%... and the long term fuel trim does not register anything :loco: This will...
  3. Understanding my fuel trims

    General E46 Forum
    Hi guys, I've had the sound of a vacuum leak under my bay for awhile now and have just gotten around to investigating it. It was not running lean enough to throw a code so that is why I delayed. Running through some fuel trim data, I have a few questions that may or may not pertain to the...
  4. INPA readings

    DIY: Do It Yourself
    Hello, appreciate if you could comment on these INPA readings, if they are ok or is there any possible fuel trim fault that can be fixed. Thanks!
  5. E4 E3 fuel trim bank 1 and 2

    General E46 Forum
    misfires in cylinders 5,6,and 4. Just had all four O2 sensors replaced with bosch. Ill try a smoke test soon after that I've read that it might be the MAF. Is their anything else I can try or check on my iCarsoft scanner? thanks!
  6. Possible MAF issue

    General E46 Forum
    I have recently been having problems with my 2003 330ci. It seemed to be a transmission issue, as the car seemed to be slipping between shifts, but I took it to a transmission shop, and they told me that the transmission was fine. The car has been shooting codes for a while now, and they all...
  7. Calling all fuel trim experts!

    General E46 Forum
    Hey guys, I've been chasing a fuel trim issue for quite some time and need some expert help. I'm including a lot of data, so hopefully it will accelerate and narrow the areas of investigation. The facts: 1999 E36 M3(not an e46, but the same basic rules apply), 96k miles, Supercharged via AA...