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vacuum leak

  1. Fuel Trims and P1188, P0170

    General E46 Forum
    Hello all. So my 2000 328i with 200K+ miles on it was sitting for about 2 weeks because I was waiting on some new parts. Went to start it, fired right up. Cylinder 3 started to misfire so I shut it off threw in the old (but not bad) coil pack I still had from when I replaced them. Car fired up...
  2. Engine light going out by itself

    General E46 Forum
    Hey guys, Case is i have had a engine light for a few months now on my 2000 E46 323i, The code is: P0173 "Fuel Trim, Bank 2 - Malfunction" I've been trying to figure it out, and think that I've narrowed it down to a vacuum leak. (Did a smoke test, and smoke came out, however I've yet to...
  3. 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...
  4. DIY P0171 & P0174 Code Diagnose/Fix - Smoke Test

    DIY: Do It Yourself
    I’ve got a 2005 325i with 112k miles that I bought earlier this summer. SES light came on recently and I plugged in my obd2 reader and found it threw the infamous P0171 and P0174 fault codes (system too lean banks 1 and 2). I have an obd2 scanner that gives freeze frame and live data, and...
  5. Rough idle/power loss

    General E46 Forum
    Hi all, Although this is my first post, I have been using this site as a reference for a while now! I have a 2002 318ci (n42 engine) automatic. I’ve got an issue that’s now really bugging me! The problem started about 2 weeks ago when my alternator packed up whilst driving home along the...
  6. Misfiring on all 3 cylinders on a single bank at idle

    General E46 Forum
    I have been having a problem for the past 6 months, where I have been getting misfire on all 3 cylinders on a single bank at idle. When I am driving, I can't tell if the misfires are present and car seems to feels fine otherwise. I have taken in the car to a few different Mechanics and one of...
  7. Vacuum Leak After DISA Rebuild?

    General E46 Forum
    Hi guys, first post here. I just rebuilt disa using a repair kit. It did not come with the o-ring, do I put it on without it. I noticed the car makes a hissing sound coming from the area. Seems to run fine, no dash lights. Is there any way of knowing it it's a vacuum leak?
  8. Lean and rich at the same, vacuum leak

    General E46 Forum
    I have an intermittent check engine light with P0174 (Bank 2 system too lean) and P0172 (Bank 1 system too rich). I just replaced the cylinder head, and a lot of the vacuum lines were old so I replaced everything that I saw. The CCV is new. All gaskets were replaced. There is one line, however...
  9. Hissing sound at front drivers side wheel

    General E46 Forum
    So I have the P0171 and P0174 codes signifying a vacuum leak and there's a hissing noise I can hear coming from the front left tire when the car is running. I was wondering if these two things are related
  10. Finally found my vacuum leak

    General E46 Forum
    This month would have been my six month of me chasing down a vacuum leak but that is no more!!!!:excited: About six months ago my car decided it was time to start giving me trouble again. It started with the fuel pump, then the DISA, then a vacuum leak. This was all in about a 2 week period...
  11. Very loud engine hissing

    General E46 Forum
    Hi everyone, my 325ci is making a terribly loud hissing noise from behind the dipstick. Previously, the dealer had told me that the DISA needed to be replaced for $650. Yesterday I used the German Auto Solutions DISA repair kit and the car is still hissing. I installed everything properly and...
  12. CCV valve help please

    General E46 Forum
    1999 323i e46 sedan production 8/98 DME MS42 auto to man 5spd swapped Hey fanatics I just replaced my crankcase vent valve which solved my P1188 and P1189 codes :woot: (caused by a split oil return/drain-back hose). Now I'm getting new codes :bawling:. Before I get into that I have questions...
  13. Check engine light help - P1421

    General E46 Forum
    I've replaced the pump, valve, and relay and still this wonderful light keeps coming back. Next on the list is to check the vacuum system. Is there anything else i should be checking/aware of before i dive into that?? Any help would be greatly appreciated.
  14. No power accelerating, rough start

    General E46 Forum
    I need help! I've got a 2000 323i e46 automatic and it has been a pain. My symptoms are: 1- if it hasn't been started in several hours, it idles rough, pops or tings, and dies. It does this until you hear the fan prime stop. 2- if I stop at a stoplight for a few minutes, it has very little...
  15. Running lean for a long drive safe?

    General E46 Forum
    Hi guys, First, a little back story. I'm from California but I spent this summer in Michigan working on some stuff for Ford (they're funding my PhD). Anyhow, a couple of weeks ago my 2000 323Ci SES light lit up and it's throwing the P1188 and P1189 codes. I replaced both pre-cat O2 sensor since...
  16. Need Help Troubleshooting my 1999 323i!!

    General E46 Forum
    Hi everyone, thanks in advance to everyone who responds to my post. Believe me I've done a lot of research, but still haven't narrowed down the problems and haven't found any visible problems. Therefore, I thought I'd post my symptoms and see if anyone can help me diagnose it. Engine Codes as...
  17. P0171, P0171 & P0174 so confused!!

    General E46 Forum
    Hi guys, I'm new to this forum. Saying that I have being reading this forum for months now, and I'm still confused. So here goes! I bought my car (2004 330ci convert) first week on June. Two days later the SES came on, so I took it to Autozone the guy showed me the code and it was only P0171...
  18. Can I find out what code it's throwing (at home)?

    General E46 Forum
    My car, an 06 ZHP vert, started yesterday with an erratic idle and seemingly a great loss of power...it ran like sh*t. Decided not to drive it and by the time I shut it off, my "Service Engine" light came on. It sat overnight. Tried again this morning, same deal. Light comes on after about a...
  19. Strange Stalling situation

    General E46 Forum
    Hello everyone, Bit of backstory, skip if you want About two months ago I bought a 2003 BMW 330ci with 133,000 miles on it. The car has been taken care of very well for the most part. I did however buy it knowing it had the p0171/p0174 infamous lean vacuum leak. The seller told me it was a...
  20. Still SES light on

    General E46 Forum
    I have had my SES light on for it seems forever and it goes on and off. I have the codes P0171 and P0174. I had a bmw mechanic look at it but he just found a small cracked hose fixed it and erased the codes. The light came back on and I don't really wanna take it to him or another shop since...
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