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  1. E46 General
    Before someone tells me to read previous posts, I couldn’t find an issue quite like this. It was negative temps lately and one morning my check engine light turned on, read the codes and it gave me a P0174 and P0313. (No P0171). Also had a rough bouncing idle. Fast forward a week- figured its...
  2. E46 General
    Greetings. I have searched far and wide through almost two decades of forum posts and yet struggle to find similar issue someone had with reliable information on the fix. I am hoping someone can help me get my car finally running like a dream again. Instead of throwing more parts at it I’d...
  3. E46 General
    Hey guys, so very recently my e46 has begun to misfire during a coldstart, and it kind of happened suddenly with no warning. But when the car warms up, it runs perfectly fine with no issues. This weekend I'll be testing the fuel pressure and conducting a smoke test. Here's the strange thing...
  4. E46 General
    P0171 and P0174, one of the most common codes E46 owners come across. It's not that difficult nor expensive to resolve this issue and the end result is a better running car. To help find the root cause, you should look at the freeze frame data of when the code was triggered. Usually, if the...
  5. E46 General
    So I decided instead of doing a back pressure this time I would buy a cheaper inspection camera from harbor freight and take a look inside my cats to visually diagnose my bank 1 cat is bad. This worked out great and I had great results. Definitely recommend the cheap AMES inspection camera for...
  6. E46 General
    I was driving this morning and my car was driving as usual, I didn't feel anything different. It still runs rough and acceleration is rough and sluggish, but I figured I have a vacuum leak somewhere that I haven't found with a smoke test (going to redo a smoke test soon). But I decide to check...
  7. E46 General
    Was going through maintenance on my 05 325 I got back in December. Fixed P0171+P0174, replaced the PCV valve plus the hoses, valve cover gasket, intake manifold gasket, all 6 plugs and a coil. Cars been fine for a week, until the CEL popped back on. Pulled the codes and it’s just P0174 by its...
  8. E46 General
    Little bit of a backstory but put short, I hit a curb my oil pan cracked, i got a “heater sprayer not working” code and i called it a day. I got my oil pan replaced as well as the gasket and i changed my oil filter and gave a coolant flush while i was at it. haven’t touched my transmission...
  9. E46 General
    I have these codes on my e46 and I’m trying to diagnose. Can’t seem to figure it out so hopefully someone here can relate and help. Things I’ve done: Smoke test (intake and exhaust) no leaks Cleaned MAF Both O2 sensors were replaced with Bosch less than 5k miles ago Fuel pressure test - fuel...
  10. E46 M3
    Hi all, I have a custom built E46 M3, we are facing an issue which we could not solve yet, and we are running out of ideas. The problem started with a hesitation during acceleration, it is more noticeable in higher gears, e.g.: pull in 5th gear, but I can feel it in 3rd gear, and even in 2nd...
  11. E46 General
    Hi everyone, I just replaced my motor mounts and used an engine support bar to lift it up a couple inches. I drove a bit after the install and got an SES, just a p0174 code. Any first thoughts as to what I may have pulled/stretched/cracked/etc. by lifting up the engine? Intake boot on top looks...
  12. E46 General
    Replaced the thermostat and the water pump recently, and changed out the coolant (which if it helps any, my car did not take alot of new coolant only about a gallon, despite me draining it as best I could, but the car isn't over heating and the temp gage stays steady in the middle, maybe an air...
  13. E46 General
    A little while back I had a lean code (P0174) throw and I posted on here about it. I ended building a cheap smoke tester and tried that out. I couldn't see any visible smoke, even after multiple different tries. (Yes I removed the oil fill cap and let the crankcase be filled with smoke, the put...
  14. E46 General
    I'm doing my vcg this weekend and replacing all my vacuum lines. while I'm under the good, I'm not sure what size hose, shop life on YouTube said 5/16ths, fcp euro on the other hand has like 4 different size hoses. I cant seem to find much about vacuum lines on this forum. could anyone help me out?
  15. E46 General
    Hello fellow e46 owners I have a p0174 lean code not both the p0174 and p0171 just the p0174 there’s no cracks in intake boots I replaced the valve cover is there anything anybody can think of it is also worth mentioning that the idle can be wonky as in it’ll fluctuate and also go to about 800...
  16. E46 General
    I have been trying to diagnose and remedy this problem for several months, and now I need the to call on the collective knowledge of the group. It all began when SES illuminated one morning as I was on my way to dealer for routine maintenance. The car was behaving normally on the roughly one...
  17. E46 General
    Hey everybody, I recently picked up a 2004 325i and I'm looking for some advice with the infamous P0171 and P0174 lean codes. I've tried a few super easy and cheap things that I figured would be a good place to start before spending large amounts of money on parts. Some background on the car: it...
  18. E46 General
    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...
  19. E46 General
    Hi. I have a 2000 bmw 320i with 213k kilometers. It has the M54B22 engnine. My car threw P0171 and P0174 along with codes for camshaft position sensor. So i fixed the camshaft position sensor and decided to try and tackle the P0171 and P0174. I found out that the CCV system was broken so i fixed...
  20. E46 General
    P0174 - System Too Lean Bank 2 P0171 - System Too Lean Bank 1 P0313 - Misfire Detected With Low Fuel P0128 - Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) I thought it was a vaccum leak and a BMW/German auto shop do a full replace of the vanos line and the...
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