Did you replace your coil with a new one?
If your CEL is on, scan and post codes here

 

Yes, we did, no change... only change of that thing, injector maybe, seemed to help... but...
No, check engine is off, car otherwise runs excellent, no other problems (except oil burning, but these 6 cylinders do burn some oil, don´t the mileage is 230K KMs)...

 

I had a bunch of misfiring codes myself and my car had the same symptoms as yours. The cause of my problem was my battery which was not putting out the amperage it should have been and so it would throw many codes along with the complete loss of power at lights. If I restarted the car it would run fine until I stopped again. Go to a autoparts store and have the battery checked.

Good luck

 

That soundst interesting, will have checked the battery tomorrow... However I don´t think it´s my case, as there is only one, the fourth, cylinder misfiring...

 

mine was cylinder 3.:read: I couldn't figure it out and gave up then one day my car wouldn't start so I HAD to change the battery. Once I did it was like my car came out of a coma.

 

OK, so you've changed the spark plug, ignition coil & the fuel injector for #4 cylinder. Am I right?? Also, did you change the spark plug coil to plug boot? Let me know. Chas

 

So... only cylinder three, poorboys? So maybe it´s the battery after all... will take it tomorrow to my mechanic and see... thanks, will let you know tomorrow...

But just in case- what other thing may be causing this problem? Maybe some sensor or something?



Chas, yes, exactly.
Sorry, I don´t understand the plug boot part... Could you explain it here with the part numbers? You mean whether the part number 2 was replaced too?

http://www.realoem.com/bmw/showparts...&fg=05&lang=en
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Sorry, the web page will not connect. The boot that I mean is the rubber part that goes directly between the spark plug & the ignition coil. It also contains the spring that provides the direct electrical connection from the coil to the spark plug. Chas

 

Yes, part #2

 

Yes, we replaced it to...

 

Sorry for that bad link...
Yes, we replaced the whole thing, including that rubber boot...


Update:

So I tried changing the battery... Didn´t help... It ALWAYS happens when waiting on lights (never when in gear)... what the hell is wrong?
I think it´s something with the software (as it happens only in neutral and is ok after restart). What should I do?

Thx, this forum is my only hope...

 

OK, now that you've changed the fuel injector, spark plug, boot & coil, next step I would do is a compression test. You gotta start by process of elimination & it seems you already have a good jump on that. Chas

 

I´ve done compression test about 4 times during the last year as well as full engine tests (just wanted to eliminate some possible bad reasons of my car burning oil, it seems to be ok, these engine do burn oil) - no problem there... The engine seems to be 100% ok, the car was bought new so absolutely no abuse (as cold engine redlining etc.)... until it´s hit by the misfire (it´s like by pressing a button- in a second it gets bad)- then only restart helps...

 

Well, your first mistake was starting to replace everything. I would have just swapped coils and see if the problem followed it. Good luck...

 

Well I just took a coil from another car (didn´t pay for it) and the same with the battery.
Anyway, that doesn´t solve my broblem now... is there any possibility of "reinstalling" the software? I bet that´s the problem...
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Update: So guys, since nothing (spark plugs, coil, injector) helps and it´s happening only when idling, there is probably something with the software... There are no other codes, only this damn 4th cylinder misfire code... Now we will rewrite the software, maybe that will help? If not, than it´s the main unit saying goodbye, right? :facepalm::banghead: