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      03-07-2020, 06:02 PM   #1
TopDownPopUps
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Terrible Misfire After Installing Coils & Plugs (N54 135i)

Hi all, I recently got my N54 135i and it had a slight misfire when warm. I replaced the coils (Delphi) and plugs (NGK 95770) and now the car runs TERRIBLY. It sounds like a cammed 302. It was not even close to being like this before.

Video of running:
https://www.dropbox.com/s/v3asiq5cz2...71934.mp4?dl=0

Checked for codes with JB4 and here is my (hefty) list:
2ded
29f4
29f5
2a15
30ff
29d
29d1
9bb
29cc

Only things I have on my car are a catless dp, JB4, BMS cone intakes, and BMS oil catch can.
I'd like to see if you guys have any ideas on what might've happened; any and all input appreciated. Thanks!
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      03-07-2020, 06:32 PM   #2
Petro135
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2008 BMW 135i  [0.00]
Funny I still remember all the codes I've got in the past. Most anyway
30ff is the dreaded boost leak. Can be anything or as simple as a disconnected vacuum line.
2ded I got once after hooking my battery back up. Cleared it never came back.
The 29f4 and 29f5 might be from no cats in your dps, i think that's what came up when i did my dp install and had yet to reflash mhd. But i could be wrong, was awhile ago.
2a15 i got when i broke my vent line connection on my lpfp it came up as a loose gas cap.
And i think the others have to do with coils
The first couple 29 ones anyway.
Are you sure all your coils are installed correct?
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      03-14-2020, 02:39 AM   #3
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Eldor coils work perfect for me...
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      06-14-2020, 08:43 PM   #4
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What are the spark plugs gapped at?
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