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...

I've read up on some discussions and have noticed that when your maf is going bad it typically reads lower... but that's not the case with my MAF. I currently have a P0171 code and have noticed that my MAF reads above 31 g/s upon acceleration or while on the highway. At idle it reads 3.7 g/s...

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...

SCROLL PAST FREEZE FRAME DATA FOR QUESTION(S) BELOW ARE ALL DETAILS YOU MAY NEED/WHAT IVE POSTED BEFORE *sorry for making yet another thread i just want to give the most detailed info and try to get the most answers i can and hopefully help others who also have a similar issue and can't find a...

So at idle (around 700rpms) I noticed my 02 Sensor 1 was reading 0 volts but my 02 Sensor 2 was reading between 0.30 volts to .65 volts and i was wondering if that's normal? Or is 02 sensor 1 faulty... I have no codes specific for 02 sensors but I have not gotten rid of my P0171 issues with my...

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?

So on my previous discussion, i discussed some issues i was having and posted the freeze frame data i got for code P0304 which i currently aren't getting anymore. Now i'm getting different codes being P0171, P16A7, P0133. Killer codes i swear. I've replaced my catalytic converters around two...

******UPDATE 9/30****** BaliDawg helped me out big time by updating my DME on 9/12 which was the factory firmware version from 2003-2004. For about 400 miles my car has been running flawlessly; the usual hesitation/studder at 2,800 rpms is gone and my idle issue seemed to be fixed. Within the...

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...

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...

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...

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...

Long time lurker, first time poster. Sorry for the long post, but I can't seem to eliminate the lean codes and misfires at low RPMs. I'm a mechanic, but generally work on classic cars from the '60s through '90s, though I'm no stranger to modern cars. This, however, is my first BMW...

Welcome. Thank you for looking at this post! I will give a short topic point to help any one who may have quick and easy information, then I will proceed to post detailed information about my E46. --2001 330CI 3.0L __NEW PARTS__ -valve cover gaskets full set felt pro -rebuilt the VANOS -fuel...

Hey guys, First post! I was hoping that I can just find some answers lurking, but seems to me that my specific problem wasn't shared by anyone else. So here it is...My SES light was one a few months ago when it was really cold, my car died after backing out of a parking spot and driving in 1st...

I apologize - I know there's too many of these, but I didn't want to hijack another poster's thread, and the resolution to my issue may take a different direction. I've read every thread I could find here and elsewhere, and have eliminated many of the common diagnoses for my Lean Code...

been trying to find the dreaded cause of P0174 & P0171 codes. I have tried Cleaning maf (looks pretty new anyways) Checked disa and is working properly and o-ring looks good Checked intake boots for cracks/holes etc... Checked for leaks with spray and listened for engine changes. Checked cover...

I have two error code P0171 and P0174. I attached the freeze frame and some fuel trim data. Please look at it. It looks like a vacuum leak. I checked all common areas, but found nothing wrong. The intake boot is new, CCV is new, and VCG is new. Follow Scotty's smoke test method, but found...

My 2005 E46 325i has SES light on. The codes are P1701 and P1704. The long term fuel trims are |Bank 1 | Bank 2 | Idle |15% | 23% | 2500rmp |3% | 9% | I tried a smoke test. There was no smoke leaking. The strange thing was that after the smoke test, the...

Ive been chasing the solution to these codes for almost a month know, has caused many headaches. To start, I figured vaccum leak simply because well the codes imply the car is running lean and I didn't figure fuel problem because the car didn't bog or have a rough idle. only time it would rough...