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      08-22-2019, 01:39 PM   #1
Excers
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Troubleshooting Codes after Engine Swap

I've got a 2011 ZCP e92 M3. Long story short spun 2 bearings and had to swap in a new engine. I am having a few codes after I installed the new engine. 2b39, 2b3a, 2b3b, 2b3c, 2b41 (Combustion misfire with cut-out cyl 5-8) The car runs perfectly with all 8 cylinders firing. I have checked over every connection over multiple times and didnít come across anything out of place. Iíve replaced both throttle actuators with the ones off my old engine which I know are good. Using the original wiring harness and DME also. The car will idol forever and not go into limp mode until after revving it. Itíll run for a minute or 2 perfectly fine with me giving it throttle but then suddenly back into limp. When I restart the car, everything is fine, and the process repeats and sheíll idol without a problem. This is all with the car up on quickjacks, have yet to drive it knowing till immediately go into limp mode. At this point I really donít know what else to trouble shoot. I have yet to find someone with a similar problem on the forums. If anyone has any suggestions it would be much appreciated.
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      08-23-2019, 02:00 PM   #2
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      08-25-2019, 01:14 AM   #3
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Seen something similar when installing a rebuilt motor. Ended up being a ground wire by the positive battery jump point. There is the main alternator/starter wire that bolts to a stud by the jump point, there is also other studs with power next to it. The ground wire was mistakenly connected to one on the other power studs not the correct ground stud that is further down closer to the coolant reservoir....... good luck
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      08-25-2019, 10:46 AM   #4
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Have you swapped the coils to a good cylinder? Installed new spark plugs? That would be the first step. If the fault stays on the same cylinder then its likely an electrical issue.
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      08-25-2019, 12:15 PM   #5
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Quote:
Originally Posted by bigjae1976 View Post
Have you swapped the coils to a good cylinder? Installed new spark plugs? That would be the first step. If the fault stays on the same cylinder then its likely an electrical issue.
Yes new plugs and can confirm all the coils work.
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