BMW e92 330i 2007 wierd misfire.

[SelmirDE]

Hallo guys,

Something like 10 days before I started feeling in my seat slight vibrqtion on cold start and sometimes when it is warm like some sort of jerk but maybe 2-3 times per minute. Until 2 days ago I started car at around 11°C and when it got to 650rpm it started to misfire and finaly got code. P0300 P03005 P0306 and B2aaa. So misfire at 5. and 6. cylinder i dont know what means last code. I shuted car down after maybe 1 minute and started up and everything is normal just like before.So yesterday i started car and it was same codes. I started with coils i swaped coils and now i dont have luck with wetter now is 20°C at night and 28 over day at this temperatures it just vibrate a little bit but without codes. I wait now for codes. I also saw that I need to change my valve cover gasket wich i orderd already beacuse i have in 2. 3. And 5. Coil hole some oil. What was also wierd is coild out of cylinder 4. I will attach photo of it and of my spark plugs. I hope You guys can spend some time and help me. Thanks

[SelmirDE]

When I read what I wrote I see how bad is my English.. Sorry guys.

[Yraceu]

Your English isn't terrible man! Its readable! anyway I think I would start with changing out your plugs after you do the valve cover gaskets. Then go from there.


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[SelmirDE]

Thank You for respond. How does mine spak plug looks like. I mean bad or good?

[Yraceu]

They look old and cruddy to be honest. I'd install new ones and go from there.


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[TonyAngel]

Selmir, it might just be my eyes or my monitor, but I'm having a hard time getting a good look at the pics of the plugs. From what I can see, the first one looks like it has heavy carbon deposits on it. This could be caused by a rich fuel mixture or maybe a coil going bad. The second picture looks like either carbon or oil. I can't tell. If it's oil, could be a leaky valve.

You've had suggestions to put new plugs in and see what happens. It looks like you should do that, but it won't cure your problem if you have any of the problems mentioned above. It might mask it for a bit, but you'll likely start having the problem again, assuming that I am correct.

I think your first order of business is to either get a BMW specific scan tool or have a scan done by someone that knows BMWs and has the right equipment to diagnose the problem. "P" codes (generated by a generic OBD scanner) are next to useless for BMWs and can often lead you on a wild goose chase.

What I said above is just based on general experience, not specific to BMWs. Getting a scan done might help you to pin point the problem. I could be way off base. Don't just start throwing money and parts at the problem until you know which way you need to go.

[SelmirDE]

Thank You Tony. I will start with spark plugs just after I change my gasket. And let someone scan it.

[soulmaker1]

I had very similar issue, mine turned out to be bad fuel injectors in cylinders 3 & 4.


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[TonyAngel]

Doesn't a bad fuel injector cause a lean condition?

[RocketSurgeon]

Injectors can fail a couple different ways. If the DME detects a problem, it may shut the injector down and throw a code. More frequently the injector leaks and causes problems that the car won't detect. Detecting a leaking injector involves running an ISTA test plan, or checking for wet plugs an hour after shutting the car off. High pressure injectors tend to leak when they fail, as opposed to regular injectors that tend to cause misfires when they go bad.

[TonyAngel]

Thanks rocket, livin' and learnin'.

[SelmirDE]

Today I got my valve cover gasket changed. Next week I will start with other stuff. But first tomorow I will see if my plugs are wet as Rocket told.

[SelmirDE]

So I checked mine sparks 1 hour after engine running and they were dry.

[SelmirDE]

I got update. Today is first time that it started misfiring when it is warm. I wqnted to park it and there was smell of gas and smoke out of exhaust. Got codes on whole bank 2 cylinders misfire. I am still waiting for inpa and cable. But wit this I would say 100% injektors. Am I right?

[SlackTube]

07 330. It's unlikely you need injector.
that coil in the picture looked like cheap Chinese trash. OEM coils were black made by Bosch and new coils are silver ( metal ) made by Delphi or Eldor depending on model.
refrence SIB 12 18 14- you probably need plugs and coils.
a bad coil can misfire completely or intermittently and is usually temperature dependent.

[SelmirDE]

Guys I have one question. Wich program is best to see on wich injektors code or to code them. I need to see that if I put my injektors on right place. My car is September 2007 do I need to use K or D can.

[SelmirDE]

I wrote it wrong I just wanna see codes in ECU so i know are they on right place.