Thread: N54 misfire
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      05-08-2019, 12:44 PM   #5
JM98
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Drives: 2009 135i
Join Date: May 2016
Location: SoCal

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Quote:
Originally Posted by Mandinca View Post
I replaced the plugs maybe 15,000 miles ago and the problem has been happening before and after I changed them. Also, all six cylinders have now experienced this issue so all six coil packs have been changed, one by one.
If it was one or two of the plugs then it would be the same cylinder each time. Also, when this first happened I moved the plug from the faulty cylinder and the misfire didn't move. I then swapped coils and it moved with the coil....so, coil failed, not the plug or the harness connection to the coil itself...right ?

I know there are some how to's on coding on the forum but for one thing it seems largely hit and miss (and requires a bit of tech geekery to make it work) and for another thing at least one of my injectors is a refurb so who knows if the codes on the injector housing are even accurate.
Have you logged AFR's? They will show if you have a bad injector.