[mcpcolas]

Originally Posted by Bimmer305

Delete all codes and drive the car to see what codes comes up.

If all three codes come up again, then it is not the coil. Never heard of all three coils going bad at the same time.

thats what im doing right now . waiting for the engine light to come back on cause i had it cleared.

[mcpcolas]

quick question? would the oil level indicator past the max line if u put too much oil in there . reason being my oil level was half way last month so i added one qt it rose just a bit so i added another quart, now im not sure when exactly it reached the max line, if its halfway through the second quart or the end . cause im thinking i might have put too much oil and it got to the plugs

[Bimmer305]

Originally Posted by mcpcolas

... cause im thinking i might have put too much oil and it got to the plugs

↑ That is impossible.

If you add too much oil, when you check the level, the car will tell you oil level too high the same way it tells you oil level low.

[ZBMW]

I had very similar codes recently after my engine suddenly started misfiring and the half engine light showed up. It cleared up but when I took it in they diagnosed bad injectors and said the problem would reoccur if they weren't replaced. I had noticed small misfires under load several times so it had been coming on for a while.
The bad part of this is that the injectors and required decoupling element cost $248 each.
Like you my mileage was below 50,000. I called BMWNA because the injectors have been a problem and this is the third version. They agreed to split the cost of the injectors which was great because the labor cost is not too bad.
The codes do seem nonspecific so I was surprised they came up with injector failure but the car now runs noticeably smoother. I think you have the same problem.

[mcpcolas]

Originally Posted by mcpcolas

this morning i started my car and it started shaking violently, then the engine light came on . so i restarted the car it wasn't shaking anymore but, the engine light stayed on, so i drove it to an Indy to read the codes and he found 7 codes
P0300
P0301
P0302
P0303
a few of them were repeated . he said the culprit could be spark plugs, coils, injectors, or the engine is leaking oil on the plugs, or the engine is sucking air somewhere other than the air intake . only mods are DCI and golf tee. the car is currently a bit over 47k . the plugs were replaced at 31k .looking at the car service history it shows at 27k i had my injectors check B13 14 10 but it does say if they were replaced or not . that's pretty much it. what do u guys think is mostly likely to be the culprit.

so i changed all six plugs and swapped coils 1,2,3 with coils 6,5,4 and that order not that it matters. to see if the misfire would follow, but it didn't. guess that ruled out coils and plugs. the car only act up at cold start it shake violently,misfire, white smoke out the exhaust then ses light come on but once i shut it off and restated it runs just a bit rough but the light goes away. another thing my lifters are extremely loud and there this weird rattle coming out the middle part of the exhaust after a quick rev. now im in the process of buying the extended warranty got the price down to $2200 for power train plus,cover major mechanical and some electrical

[enrita]

leaky injector

[mcpcolas]

Originally Posted by enrita

leaky injector

anyway to test them without going to the dealership?

[enrita]

Originally Posted by mcpcolas

anyway to test them without going to the dealership?

remove the plugs in the morning from bank 1 . if one of them is wet or very sooted you know which injector is leaking. i had the same issue. would get misfire cylinder 4 than multiple so i knew it was 4.
basically left overnight it leaks into the cylinder.

[MilehighM3]

Originally Posted by enrita

leaky injector

This. Cold start N54 misfires are leaking injectors. Period