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  1. Vanos issue with no vanos codes?

    ///M3 Forum
    After a little bit of testing and trial and error I have been able to narrow down a consistent misfire on my car at 4+k rpm under load and only under load. Issues started off as an intermittent cylinder 3,4,5 misfire (not noticeable but the code was there). This then progressed to the car...
  2. 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...
  3. Misfiring on Cylinders 1, 3, and 6(Help!!)

    General E46 Forum
    So I have replaced the oem headers with aftermarket catless headers. I’ve been driving with CEL on and I want to try and fix the misfiring problems. I’ve got 3 misfires on my engine. I only have the o2 sensors that go before the cats on and the ones after the cats are off. Recently I have...
  4. Misfires :/

    General E46 Forum
    Hi there, I have a 2001 BMW 325XI with 180,000 miles. My dad bought the car when it had 3,000 miles on it and we've maintained it ourselves since, and I bought the car from him when I turned 18. I went on vacation for a few days last weekend and the car was sitting unused for 4 days. I drove it...
  5. Changed Coils, Plugs, 02 Sensors, Now what!!

    General E46 Forum
    Hello Brethren and Sisteren, I have a 2005 325xi with 130K. Been a dream until recently. It starts great cold, runs rough and misfires warm, and I am throwing codes P0304,5, and 6. I had to replace an 02 sensor Bank 2 Sensor 1 that had its wire melted against the manifold. Changed out the...
  6. Stupid random misfires...AGAIN

    General E46 Forum
    The codes I'm getting are 300 (random misfire) 1343, 1345, and 1347 (misfires on cylinders 1, 2, and 3 with fuel cutoff). I had several other codes prior to these which led me to watch a YouTube video and replace the valve cover gasket, all 6 ignition coils, and all 6 spark plugs. I'm down to...
  7. Misfire on all cylinders

    General E46 Forum
    Hi guys I have misfire codes PO300 PO301 PO302 PO303 PO304 PO305 PO306 I have an engine knocking and it sounds like it's coming from the intake manifold. I think what happens is one cylinder misfires then they all. I've replaced the Disa and CCV lines which took care of the lean codes I used...
  8. Random misfires?

    General E46 Forum
    Hey there, I changed the oil separator, intake manifold gaskets, and a ton of vacuum lines on my 2001 BMW 325XI last week. When I tried starting it up, I was getting some misfires with a P151 code. I let it run a bit to see if there was air in the fuel system and the misfire went away shortly...
  9. Problems after engine swap (320->328)

    General E46 Forum
    Hey! I've been using this forum regularly for the past 6 months or so, but this time I cannot find an answer to my questions. So I'm making this in hope of sorting out my issues with the help of the wizards on here. I'm gonna try to be detailed in explaining my problems, but it is rather...
  10. Rough Idle, Poor Performance, and Misfires

    General E46 Forum
    I have a 2001 325i sedan that I am absolutely in love with it, but the problem is that the overall performance all of a sudden sucks. My check engine light came on so I took it and got the codes read. Well the guy at autozone helped me out by finding exactly what was causing the codes to be...
  11. Need help please on my323ci

    General E46 Forum
    So I had to replace my oil separator and hoses . I replaced all my spark plugs & coils & O2 sensor. And it's still misfiring and SEL light is on.. Can some one please help I've spent a lot and I need some piece in mind and help me figure this out..please and thank you..
  12. 01 325XI Vacuum help needed

    E46 Xi Forum
    I'm having a rough idle, stalling with my MAF connected (multi random misfire codes). I've replaced CCV and hoses, upper and lower boots, several vacuum lines at rear of manifold. However the vacuum listed as #9 in the diagram is off. I've searched for days but can not find out where it goes...
  13. Codes read, Need a fix

    General E46 Forum
    randomly thought I should check on fault codes on the M3. I have a Peake R5/FCX and these codes came up. 1b = Table 1b 01 = Fuel Pump Relay C4 = Misfire Cyl #1 C5 = Misfire Cyl #2 C6 = Misfire Cyl #3 CC = Misfire Multiple Cylinders Now I need the E46 M3 guru's to give me a hand and point...
  14. Misfire Cyl 1, running out of ideas

    General E46 Forum
    I've had this issue for a while now Cold start in the morning, the car starts fine but as the RPM's drop, it starts shaking and will misfire. I can turn the car off and back on, then it idles a little rough (not as much as the first time) but once the temp gauge goes past the blue area, its...
  15. running on 3 out of 6 cyl

    General E46 Forum
    Been a while since I've been here but I thought I'd give it a try. Just recently had to garage my e46 due to smoke and misfires. These are the symptoms: 2002 bmw 325xi, 2.5L inline 6 cylinder -smoke from tailpipe -very low power and erratic idle -cylinders 1,2,4 misfire with fuel cutoff...
  16. 2001 325i Rough Idle problem! help!

    General E46 Forum
    I have a 2001 325i that goes in and out of rough idle. It will run fine when cold then after a few minutes will jump from 5k rpm to 8k rpm during idles...sometimes it turns off. I took it to the dealer in 2003 and they had it for three weeks and could not find the problem. After replacing...