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rough idle

  1. 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...
  2. Need Help Diagnosing Misfire and Lean Condition

    General E46 Forum
    As a New Yorker who suddenly cannot use public transit for health concerns (please don't take this political) I actually need my car. Of course, it developed a sudden problem on Sunday while I was away checking on my parents. The car seemed to struggle at idle and actually stalled as I pulled...
  3. Engine idles rough in neutral only

    General E46 Forum
    Let***8217;s just say this I had to pull the engine out to replace my disgusting after market headers that were not sealing properly (previous owner), I had to remove the transmission which was impossible to disconnect to due a seized top stud. Even with the engine and tranny out together it...
  4. P1635 oil leak killed DME?

    General E46 Forum
    My 2005 330i zhp was running fine then power dropped and idle would surge from 1000 rpm to 1500 rpm. Did not respond to throttle. Checked engine codes and got P1635 and somtimes P1634 both about the throttle body adaptations. Did some searching didn't find much. Took the car to the Dealer 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. Random Misfires. Possible Head Gasket

    General E46 Forum
    Hi guys. 2005 330xi. 160,000 mi. Hoping to get a little expert advice trying to pinpoint this misfire problem I'm having. I read for hours but couldn't find matching symptoms. 2 weeks ago I started having these rough idle/random misfires right after i got gas somewhere. Maybe coincidence...
  7. Random Misfires. Possible Head Gasket

    Driveline, Engine & DME Tuning
    Hi guys. New here. I read on here for hours but couldn't find a post matching my symptoms. 2005 330xi. 160,000 mi. Hoping to get a little expert advice trying to pinpoint this misfire problem I'm having. 2 weeks ago I started having these rough idle/random misfires right after i got gas...
  8. 2008 335D Rough idle Help!

    E90, E91, E92 & E93 - General Forum
    Hi there! I’ve recently purchased my 2008 335D and and it’s been running sweet as a nut up until this morning. The cars sitting at about 88k on the clock and as I got to work and sat in the car park I noticed that it was idling rough. It normally sits about 800rpm on idle but sitting this...
  9. Hole in intake manifold, ccv replacment

    General E46 Forum
    e46 m52tub engine. The previous owner for unknown reasons decided to drill a hole in the intake manifold, stick a vaccuum hose in it, connect that hose to the fuel pressure regulator and plug the vaccuum hose that goes to the ccv with a rivet. Does anyone know why would you that? And what would...
  10. 320ci M52tu cold start problem and rough idle

    General E46 Forum
    So I recently bought a 00' 320ci with 145k miles on it and it has this problem when it's cold it usually starts but it has a rough idle and has no power for the first few minutes. And sometimes if I give it some gas while it's running like this I can hear a loud pop... I've also noticed if I...
  11. Rough Idle, not running on all cylinders

    General E46 Forum
    I have a 2003 330Ci vert with 193,000 miles (310,603KM) with a rough idle and over all sluggish performance. This mimicked the behavior of my DISA failure but unlike the DISA failure clearing codes doesn't even give a moment of clean idle/running. The issues began today when I went to start my...
  12. Bad fuel-pump symptoms?

    General E46 Forum
    Hi. I have an E46 325i that is "idle-hunting" The idle goes up and down. I've replaced and checked alot of different things to fix this such as Vanos seals, DISA-valve, intake boots, ICV and some more parts, but I haven't been able to solve it. Now I'm suspecting a bad fuel-pump. But...
  13. 325i rough idle - bad injectors?

    General E46 Forum
    Hi! I've been struggling with a problem with my 325i engine in my BMW e46 325ci for a long time now. The idle is jumping up and down until it most often settles at 800rpm but sometimes it stalls. Also sometimes the car is veeery weak when starting from a stop. I've changed most things I've come...
  14. 6 codes, and I've tried everything.

    General E46 Forum
    Okay, so I've been having an issue with this horrible howling/whistling noise coming from the engine for the last two months now. I've replaced the DISA seal, intake boots. I replaced the CCV system with a catch can system. NONE of this has fixed the howling. The only thing that the catch can...
  15. 318i E46 N46 2004 Hesitation/Rough idle/ pops in airbox

    General E46 Forum
    Hi everyone, newbie here. Having had a few BMW's of my own over the years with no serious touble I have bought a 318iSE for my son. Bought knowing it has running issues but only to find the young idiot who owned it looks like he has been mucking about with it himself trying to fix it... nuts...
  16. 2002 325i all of a sudden rough idle - no codes

    General E46 Forum
    Really frustrating - the CCV was replaced with a cold weather package about 3 months ago, and now I get this rough idle that goes away when I disconnect the MAF - the MAF is brand new (literally - installed it last night) in response to the rough idle. I have just about taken the intake...
  17. Rough Idle

    General E46 Forum
    Hey guys my problem this time is a rough idle. Yesterday I drove my car for atleast 2 hours and it was perfectly fine and smooth but today i went to go for a joy ride and it was really rough! I have no idea what its due to. I thought maybe it was something with the fuel pump cause it was on a...
  18. 325ci Error codes during startup

    Tire & Wheel Forum
    Hi, I'm a new BMW owner. Just purchased a 325ci about three months ago and I've been working my way through getting all the error codes corrected. I have a very strange combination of error codes that appear in the computer every time I start the car. I've cleaned the idle air control, DISA and...
  19. Intake Manifold Backfire

    General E46 Forum
    Hey e46fanatics, So I have a problem with my e46 when I turn it on after a few hours of sitting the idle is very rough (sounds liked a cammed car), I usually let it warm up for a few minutes and everything works fine. I did forget this morning and "drove" it right after turning it on. The...
  20. 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...
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