[SV_Amjad]

Got a misfire problem on my 2007 e92 328i. Changed all 6 coils, worked for a couple days, then misfired again. Now I'm reading a misfire in cylinders 4,5,6. Changed plug and coils. Any suggestions?
Intake and straight piped exhaust are the only mechanical mods.

[W37V]

Check your if your coils are seated properly.

[Ruddigger]

Injectors?

[bhmax16]

How many miles? Not likely an engine issue but I would check compression anyway for good measure.

Unlikely you have 3 injectors that are bad, but I suppose anything is possible.

I'd suspect a possible wiring issue. You said it worked for a few days then started again, so check that the coils are seated and for loose connections or chaffed wiring.

[SV_Amjad]

So i have 3 sets of ignition coils.
1) My oem ones with 101k
2) Used bosche with 32k
3) Brand new duralast set.
I changed spark plugs yesterday to a fresh set of bosches. My misfire comes and goes now. I used to have misfires in cylinders 4,5,6 but then at one point i was getting misfiring codes on 1,3,4,5,6 and now all of sudden its running good, i drove it for about an hour with no problem.. but as soon as i headed back towards home and i was a street away, SES light comes on and i get a code for cylinder 1 misfire. haha. I put some lucas fuel injector cleaner in the gas tank hopefully that helps. Im leaning to something fuel related maybe?

[Taskmaster]

No other codes?

[SV_Amjad]

Im getting P0300-P0306. And then codes for a multiple/random misfire detected.

[Taskmaster]

Failed crankcase vent valve, or a gasket for the valve cover. Use carb cleaner to see if there is a leak.

[Willsbma]

Originally Posted by SV_Amjad

So i have 3 sets of ignition coils.
1) My oem ones with 101k
2) Used bosche with 32k
3) Brand new duralast set.
I changed spark plugs yesterday to a fresh set of bosches. My misfire comes and goes now. I used to have misfires in cylinders 4,5,6 but then at one point i was getting misfiring codes on 1,3,4,5,6 and now all of sudden its running good, i drove it for about an hour with no problem.. but as soon as i headed back towards home and i was a street away, SES light comes on and i get a code for cylinder 1 misfire. haha. I put some lucas fuel injector cleaner in the gas tank hopefully that helps. Im leaning to something fuel related maybe?

Not loving the idea of Duralast coils...
Fuel injector cleaner isn't gonna help 6 cylinders misfiring. Make sure the plugs are tight and your coils are pushed down all the way

[Taskmaster]

Crack in VC, gasket or crankcase vent is my bet

[SV_Amjad]

returned duralast coils cause eff them haha only bought them to try and see if it helped or fixed the problem. Ran the injector cleaner and it seems to be running fine now? has oem coils off of another 328i with 32k with new bosche plugs