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  1. E82 120i intermittent starting issue and lumpy idle

    BMW 1 Series - Tech Talk For All Gen Of 1 Series
    Hi, just wondered if there are any known issues to check that can cause a 120i petrol to crank for longer before firing about 1 in 20 times starting it? Also has the odd lumpy idle about once a week. Car is a 2013 coupe 54k miles, not modified. Had new plugs to try to solve it but no change...
  2. Lumpy idle after cold start 2010 330d

    BMW 3 Series - Tech Talk For All Gen Of 3 Series
    Hi guys. Purchased my new car a couple of months ago in the form of a 2010 E90 LCI 330D MSport with 115000 miles on the clock. I’ve noticed some mornings when I jump in and start it the revs are up and down and car is jerky until it warms up after a few minutes. Previous experience with other...
  3. lumpy idle really doing my nut any advice pleasenow

    BMW 3 Series Forum - Technical Talk on the BMW E46
    right guys so i have now changed both cam sensors, both timing solenoids and the VVT motor, also changed one of the pencil coils as even when clipped in you you pull it out with ease It still judders and is a bit lumpy on starting but then a few seconds it sorts its self out and idles the best...
  4. 2005 E46 330ci Intermittent Misfire

    BMW 3 Series Forum - Technical Talk on the BMW E46
    Very occasionally on cold start, my 160k mint 330ci misfires. Sometimes it will clear on a switch off/switch on. When cleared, it is smooth for as many miles as can drive and never messes around when warm. DISA ok and Vanos ok. V smooth engine - when not misfiring. Changed No4 coil as I thought...
  5. E90 320d lumpy idle and possible over heating

    BMW 3 Series - Tech Talk For All Gen Of 3 Series
    Hi, I've just picked up a nice little E90 320d and love the car but the engine seems to run a bit lumpy when idling. Is this a natural characteristic of these engines? and also when stood in traffic it starts to smell hot / coolant but no warning light come on and not sure if fan is working...
  6. 330i slightly lumpy idle

    BMW 3 Series - Tech Talk For All Gen Of 3 Series
    Morning guys, I went look at a 59 plate 330i with 50k miles. Everything seemed okay but I noticed a slightly rough/lumpy idle which disappeared after a minute. I didn't think much of it as I heard the N53 was very reliable and assumed it was just a cold start thing. The car drove well and I...
  7. Cold start lumpy idle 320d

    BMW 3 Series - Tech Talk For All Gen Of 3 Series
    As the weather is getting cold now. The a couple of times in the past week when the temperature has been down around 1/2’c. When I initially start my car the idle is really lumpy, almost like a misfire. If I take the revs up a little bit it seems to sort itself out. Any ideas? When it’s warmer...
  8. While 320d is warming up, acceleration is lumpy and flat

    Technical Guides for the E46
    I have. a BMW 320d 2003 with 193K on the clock. Never had any major issue and replaced oil every time the trip computer has told me to. The car starts, idels and drive well when first starts, then when the car gets warm but not at full running temperature , acceleration is lumpy and flat, the...
  9. 2012 E90 320d Auto Gearbox Lumpy Gear Changes/Stall

    BMW 3 Series - Tech Talk For All Gen Of 3 Series
    I have a 2012 E90 320d with an auto gear box. It has 49k on the clock. I've started to find that gear changes at the lower end are becoming lumpy. Changes are not as smooth as they once were. I've also had the car stall on me, but this is only twice within the last 6 months. Today when it...
  10. Fuel issues or something else coincidental?

    BMW 3 Series Forum - Technical Talk on the BMW E21
    I have an E30 with an M52B25 and it's run like shite since a lousy mechanic installed a replacement fuel tank. Difficulty starting, lumpy idle (~600rpm), occasional lurching/spluttering like it wants to cut out, inconsistent/lower power delivery, and occasional stalling at red lights and...
  11. Lumpy idle - white smoke - maybe on 3 cylinders -

    BMW 3 Series - Tech Talk For All Gen Of 3 Series
    Hi each and all - I have just taken on a project I hope I wont end up regretting lol I purchased a 2007 320d Coupe - 98000 miles FSH - 2 owners I am hoping in my hour(s) of need I can fall back on your knowledge and experience - So lets get started with the problem(s) with this BM it...
  12. E39 530d grey smoke from cold and lumpy idle

    BMW 5 Series - Tech Talk For All Gen Of 5 Series
    Hi guys newbie here! Just got myself a 2002 e39 530d it's got just over 100k in the clock but starting from cold it's lumpy and bellows grey smoke out the back 😞 Smells nasty makes your eyes sting! Tried to plug in via obd port but can't read the engine but it talks to everything else. One...
  13. 645ci lumpy cold idle (not random, very evenly spaced) smooth...then momentary drop...smooth...then momentary drop

    BMW 6 Series - Tech Talk E24,E63,E64,F12,F13
    Only had the car a couple of days...all good after a few mins to warm up, makes a fair bit of noise from Vanos ends when the revs drop.... Probably runs smooth for 3 seconds, then it drops for maybe less then 1 second, then smooth run for 3 seconds... and so on. Car still drives fine from...
  14. 2009 330d - Lumpy cold start/ fault code help

    BMW 3 Series - Tech Talk For All Gen Of 3 Series
    Hi, I have a 330d manual 59 plate with 60k miles on the clock. When it's first started in the morning it runs really lumpy, like it's not firing on all cylinders and then clears after 40 seconds. There are no warnings lights on and it drives lovely once warm. I had a local garage do some...
  15. 2002 E46 325ti *UPDATE* found source of lumpy idle/misfire

    BMW 3 Series Forum - Technical Talk on the BMW E46
    Hi all,Got in car to come home from work today and started with a lumpy tick over, then on way home the engine light came on (1st time in six years). Plugged the Carly in and it came up with three engine faults, two of them were related to the Lamda sensors, forget exactly what, and one was the...
  16. Lumpy idle

    BMW 3 Series - Tech Talk For All Gen Of 3 Series
    Hello, I have a E91 320d with the N47 engine that has done 105k miles. I have a couple of issues, I think the cam chain is becoming noisy, and unsure if I should replace now? But the main reason I came here today is because there is a missfire when cold and the engine is idling. Is this...
  17. 2004 320d e46 lumpy idle but only when stationary !

    BMW 3 Series Forum - Technical Talk on the BMW E46
    Hi All I put a post on here about my car having a rough tick over, I went out in it today and noticed that when doing just a couple of mph and with the clutch pressed down the tick over was fine, as soon as I stopped then it became rough again !! Any help on this would be greatly appreciated Bill
  18. E36 318iS M44 coupe lumpy idle

    BMW 3 Series Forum - Technical Talk on the BMW E21
    Hi All I’ve been trying to figure out a lumpy idle issue I have on my e36 318iS M44 1998 coupe for a while. (This is a lengthy post with quite a bit of info so hang in with me ;) ) I’ve been working with another forum member to compare some notes and had some guidance, great tips & support...
  19. Having a lumpy idle on BMW 318 E46

    BMW 3 Series Forum - Technical Talk on the BMW E21
    Hey, i've been having rough idle on my bmw e46 for a little while now... i decided to run a diagnostic on it to see if that would shed some light. I found this: Knock Signal, Cylinder 1 - 2.34V Knock Signal, Cylinder 2 - 2.27V Knock Signal, Cylinder 3 - 2.19V Knock Signal...
  20. Rough and lumpy engine

    General BMW Discussions
    Hi all, really really need some help as 2 garages now can't tell me what's up, I have a E90 330d, while driving at a steady speed and idol the revs are very rough, while useing full power or trying to over take the car will go in limp mode or cut out, I have been told it could be an injector...
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