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Got a 2007 E90 335i.
Had 100km or 60k miles on it.
Miss fire was there but no code.
Finally day before scheduled visit at dealer, I went into limp mode and had a code.... (I was happy)
Lol
Instead of guess like you are now, I knew where to start.
Code was for intake solenoid.
Well that was not my issue.
Here is what I did to fix my miss fire issue.
1) dealer did a walnut blast... No warranty here. Paid too much... But well worth it.
Think of a intake port cleaning as one of those regular services that must be done..... Regardless.
Be thank full it is every 40-60k miles.
But soon as I picked up the car, wow, what a performance difference.
2) I changed my Solenoids, both intake and exhaust.
My old ones are very clean.
That did not do anything.
Still miss firing....
Changed my plugs..... That did little.
Very little.
Then changed my coils week later.
No more miss fire.
The only miss fire I get now is at cold start initial start when rpm is dropping down to 600 from 1100.
Also, regarding damage to your turbos..... I read that your turbos get the most damage at cold starts.
I don't push my car much until temp is about 120 or higher.
In short the problem was intake ports, plug(s) and coil(s).
Ohhh also 2 cans of BG44k back to back on 2 tanks of gas.
Didn't notice any change.
Hope this helps.
DN
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