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maf

  1. Please help!

    General E46 Forum
    I bought an E46 320ci 2004 yesterday, drove home lovely and all day no issue. Then went to leave a friends and it wouldn't start. The MAF sensor was left dangling but plugged in by the prev owner and a cone filter was left on the intake pipe. The car originally turned on and then died after a...
  2. No start after MAF HACK

    Driveline, Engine & DME Tuning
    Successfully got the DME into boot mode and upload the proper 512k file per the wiki and able to tune the calibration files just fine with ROMRAIDER. Trying to turn on the MAF hack using the community patch file in tuner pro and also in rom raider and load the 512k file back in using JM and boot...
  3. Siemens MAF partnumber differences

    General E46 Forum
    Can anyone tell me the difference betweek a MAF with PN 5WK9 6471 and 5WK9 6472? Both are suppose to fit a 325i ... and look identical .. but My old one is 0471 ... Here's another example of the same thing Notice the top items Both fit 325i , but have different skus and no clue as to what's...
  4. Siemens 5 pin MAF

    General E46 Forum
    Is anyone able to share a functional pin out description, schematic, or wiring diagram for the Siemens 5 pin MAF ? just a pin out description would be helpful. (that would be the late 2003 -2004 3.25i) Thanks in advance..
  5. E46 error code P0173

    General E46 Forum
    Hey guys, I've had quite the headache around my car - a 2000 e46 323IA - the last few months. It threw me an engine light, and I've since tried to figure it out. IMPORTANT TO NOTICE The car drives fine, however it does idle abit rough sometimes, I don't believe this is tied into the problem I...
  6. 3.25i (E46) Bank 2 only fuel trim

    General E46 Forum
    I want to share my unexpected experience. (I'm an experienced mechanic and electrical engineer), but this is my first BMW. We purchased a sweet 2004 3.25i, expecting to do a lot of work including replacing all the rubber, cvg, DISA etc. After we did that the car had what appeared to be a vacuum...
  7. Fuel/MAF tuning understanding

    Driveline, Engine & DME Tuning
    Hello all! I am just getting started into learning about ECU tuning. I watched a really good series on Youtube (video at bottom of post) that talked about the general process of tuning. Someday in the far far future I would love to turbo my car (325i) so I am trying to apply what I learned in...
  8. MAF stopped working?

    General E46 Forum
    Hello guys, i need some opinions what could have happend. My e46 330i was running fine, but it was leaking oil on drive-thru. So i decided to change oil filter housing gasket. After i've done that, when i start cold car for the first couple secounds rpm's jump up and down, when its a little warm...
  9. Any E46 Siemens Mass Air Flow (MAF) Sensor

    Miscellaneous BMW and E46 Parts
    Original, pulled from 2000 323i and tested working. PM if interested! https://photos.app.goo.gl/Jr8kW4D7W18TpzPw6
  10. P0101 CEL Code - MAF working?

    General E46 Forum
    Hello all, long time lurker and first(ish) time poster! I drive a 2005 330xi. So this past Sunday I spent about 2 hours replacing the lower intake boot (massive crack in it) as I was getting some nasty lean conditions. While I was in there I took out the ICV and cleaned it really good with...
  11. A/T safe mode after MAF codes.

    General E46 Forum
    Hello all, First time poster and first time BMW owner. We have a 2002 325xi for my kids' daily driver. While leaving the neighborhood, the CEL came on along with the transmission cog light. Car stopped moving. After turning off the car and letting it sit for a while (as per the manual), the...
  12. P0102 followed closely after by P0171 & P0174

    General E46 Forum
    Hey guys, I searched the forums already and saw some issues similar to mine but nothing 100% similar. About 4 days ago, I got a P0102 code. I decided to grab some MAF cleaner and hit my MAF up a little bit and clear my code too see if that fixed it. So no biggie there. Following this, about a...
  13. The Dreaded PO171 / PO174 DTCs... Vacuum Leak or MAF issue?

    General E46 Forum
    Fairly new here and 1 month owning a pretty nice 2003 330ci convertible. These 2 codes popped up twice now; looking for advice as to whether look towards a vacuum leak(s) or a faulty MAF sensor? Leaning towards the MAF because both times the codes dropped during highway speed driving (never...
  14. Code P0102 and P0113 Troubleshooting Help!

    General E46 Forum
    So I originally had P0171 System Too Lean (Bank 1), P0174 System Too Lean (Bank 2), P0171 System Too Lean (Bank 1), P0174 System Too Lean (Bank 2) codes read after I got a service engine soon light come on. After research through the forums, I came to the conclusion that I had a vacuum leak in...
  15. Throttle Body.

    General E46 Forum
    I have a 2000 323i with over 200k. I've just done some cooling system work and I'm getting codes P1580 throttle body mechanically stuck and P1622 MAP cooling thermostat control circuit electrical. I just replaced the thermostat and the cooling temp sensor (including reconnecting the wires...
  16. Misfiring due to vacuum leak, but hardly any codes????

    General E46 Forum
    Hi everyone. I'm new to the forums and new to BMW's in general. i've always owned a jeep ever since i started driving, but I have had a variety of vehicles since then as well. Grand Cherokee (ZJ and my current WJ), Cobalt, B6 A4 1.8t Quattro, 2010 Lancer, 4th gen Ram TRX4 and the most recent...
  17. E46 no start issue after expansion tank repair

    General E46 Forum
    Hi all So I have been having some issues w my 2004 BMW 325ci TL;Dr I replaced a fuel pump and expansion tank. I tried to start the car with the maf and air box disconnected. Resulting in a no start/crank. It started when the car stalled and started back up after a few turns. A couple days...
  18. E46 Bad MAF. Clean it or Replace ?

    General E46 Forum
    Found out I have a bad MAF. Should I replace or clean? I don't know if it usually starts to work if you clean it..
  19. Rough idle/stalls on cold start, a problem from hell.

    General E46 Forum
    Hey friends, First post! Ive been stalking these forums for years now, and only now did I need to make a thread of my own for a problem. Goes to show how much intelligence there is in this community. Hopefully you guys can help me out. So here goes, this is a bit of a long one, so buckle up. I...
  20. LTFT, MAF and Cylinders - does this look right?

    General E46 Forum
    Hi guys. I replaced my MAF sensor today. The reasons: it was showing fault 120 in INPA, poor RPM at idle, my cruise control was switching itself off, all there may be because of bad MAF. So I purchased a second hand one and connected it to the car (BMW E46 318i M43 2000). Is there some coding...
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