03-27-2019, 08:12 PM | #23 | |
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2013 F30 335i xDrive M-Sport 6MT (FBO/BM3 custom tune by HCP, 91 oct, 550i clutch, xDelete)
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03-27-2019, 08:23 PM | #24 |
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Speaking of tunes... anyone try out the MHD tune yet??? How does it shape up against bm3, or even Jb4 for that matter. I've heard bm3 gives smoother response.
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03-28-2019, 01:59 AM | #25 |
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I gapped them at .018 because there was still hesitation at .024. the hesitation has improved now but is still there
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03-28-2019, 02:01 AM | #26 |
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I have bm3 and love it
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03-28-2019, 02:02 AM | #27 |
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I have put the stock tune on and the hesitation isnt there only when bm3 is on
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03-28-2019, 08:05 AM | #28 | |
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https://f30.bimmerpost.com/forums/sh....php?t=1531734 |
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03-28-2019, 10:44 AM | #29 |
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thank you for finding that. but spark plugs are now ruled out. the stutter was there with the oem ones and still persists after ngks
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03-28-2019, 12:50 PM | #30 |
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Clutch slipping.
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03-28-2019, 01:26 PM | #31 | ||
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So why would a more aggressive tune lead to misfires? Perhaps the octane is too low, or maybe older plugs will help? Or maybe the BM3 wasn't connected tightly, and getting a bad reading? Or it could be defective. |
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03-28-2019, 01:29 PM | #32 | |||
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03-28-2019, 01:36 PM | #33 | ||||
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03-28-2019, 01:44 PM | #34 | |||||
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Buddy who has made 20 different posts about his misfiring n55 should prepare himself for the news that it is actually his clutch slipping and the dme detecting misfire based on the slippage. And people in general should get over trying to solve everybodies problems they have on their cars by telling them to change spark plus or adjust spark plug gap and then when they waste their time and money doing that they come back and say to get new coil packs and when that fails.... unplug bootmod3.
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03-28-2019, 04:35 PM | #35 | ||||||
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He said that disabling his Bootmod solves the problem, so it doesn't seem like a slipping clutch to me, it seems that the misfire happens under the higher stress conditions when the tune is enabled... fuel flow increases, heat increases, cylinder pressure increases. These all point to an ignition-related condition, but of course I can't say for certain. If there's 200 left on the warranty, I'd try to reproduce without the Bootmod and report it, that way, the repair still needs to be made even if mileage exceeds the warranty maximum. |
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03-28-2019, 05:00 PM | #36 | |||||||
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Clutch slips when running tune due to approx 100wtq more than what the car pushes through the clutch stock. Dme reads the slippage as misfire and pulls load/timing. Stock clutch not designed for so much torque.
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03-28-2019, 10:41 PM | #37 | ||||||||
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I just got my car back today, they couldn't figure shit out. They logged the engine and checked injectors but all they told me was that they couldn't fix it and it's most likely a coil misfire. Only thing is I just changed the coils specifically because of the misfiring so now I'm just clueless. Engine seems to misfire more when cold. |
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03-28-2019, 10:46 PM | #38 | |
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03-28-2019, 11:01 PM | #39 | |||||||||||||||
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Uhh I'm not the one with the bootmod, but I am the one with 200 miles left on the warranty however. Still dunno what's wrong sadly enough. Bimmer shop couldn't figure anything out. |
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03-29-2019, 12:45 AM | #40 | ||||||||||||||||
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03-29-2019, 01:33 AM | #41 |
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check your injectors, when my car was making weird idle/stumbles on WOT I guess my injectors weren't to spec, but weren't bad enough to throw any codes. I didn't know anything till my HPFP failed and took out my injectors too.
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04-16-2019, 03:24 PM | #42 | |
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05-22-2019, 08:51 PM | #43 |
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i changed my coils last week and the hesitation when downshifting went away. today i was driving and it is happening again.
recap. i am running bm3 stage 2 e30. changed to ngk spark plugs gapped at .018 3k miles ago. changed all coils about two weeks ago. i have cleaned my maf. i have used chevron techron multiple times the last year. i have er chargepipe and wagner evo 2 comp intercooler. a res delete and wagner catless downpipe. afe pro dry drop in filter. my car has 74k miles. is getting a walnut blast the next step? car runs beautifully when i take off bm3. no rough idle or hesitations when normally driving. only in wot. my car is 6mt 2013 f30 335ix n55. i am discouraged because why should i continue to mod if i cant hold the power i have now. i have hit up pro tuning freaks about this but not since i changed my coils because i thought issue was resolved. i have sent them logs too. back to the drawing board. |
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