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02-22-2015, 07:11 PM | #1 |
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128i Engine Miss
Hope this helps folks. My 2012 128i developed an engine miss last week. Seemed like an ignition miss and would only happen when accelerating. Usually when merging with traffic or passing, rarely from a start. Idled fine. I replaced the spark plugs which looked worn and had about .060" gap. She has 68K miles. I replaced them with the only plugs available from any of the parts stores in town, Denso Iridium TT IKH20TT. Resolved the problem and she runs great again. I would have preferred NGK or Bosch, but she's happy. Pretty easy to change after watching a couple YouTube video.
Hope this helps anyone else that experiences a miss in their 128i. MontegoCoupe |
02-22-2015, 10:49 PM | #2 |
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Hmm, since it's a 2012, I would've thought you'd take it to the dealership, since it's probably still under warranty...
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02-23-2015, 01:07 AM | #3 |
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02-23-2015, 06:27 PM | #4 | |
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Easy fix
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02-24-2015, 02:05 PM | #5 |
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That's what I was thinking. I had a misfire develop around Thanksgiving, at times it was very bad but then it settled down to just a little stumbling under light acceleration. One coil later and I was back in business. My check engine light was on intermittently, don't know about you. Best of luck.
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02-25-2015, 06:59 AM | #6 |
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My N51 has done this twice in the last month. After a few seconds it goes back to normal. I will pull the codes and talk to the dealer about getting it fixed under the long term California emissions warranty.
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02-25-2015, 01:55 PM | #7 |
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Yikes, I missed that bit of info... Sorry.
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04-13-2015, 03:35 PM | #8 |
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I started noticing the same problem as OP on my 2011 128i, gradually getting worse...engine stuttering and shaking when accelerating with a cold engine (less that 10 minutes warmup). Back off the gas and it would go away, but if I continued giving it gas the CEL would come on and the problem would persist until I powered the car off/on again (awkward, but not a problem with the 6-speed). Otherwise, normal running.
Anyway, 70k miles, out of warranty, so I went ahead and changed the spark plugs since they were overdue. Not a hard job aside from getting to the coils. And I needed over 6" of extension for my ratchet at one point. I also ended up changing out the cabin filter on the way. Bosch double-platinums, in stock at AutoZone. Originals were NGK and looked pretty well-worn: Problem solved...full acceleration restored. Hope this helps others. |
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04-13-2015, 03:52 PM | #9 |
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Those NGKs cannot be factory....
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04-13-2015, 04:57 PM | #10 |
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04-13-2015, 10:39 PM | #11 |
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