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STILL Misfiring.. PLEASE HELP!!!! *Update Video
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09-18-2021, 09:18 PM | #1 |
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STILL Misfiring.. PLEASE HELP!!!! *Update Video
I’m begging for help at this point… my MHD wireless adapter literally just came in the mail and I just want this problem to end!
2008 335i N54… Mods are DCI, charge pipe/bov and just a few days ago I put on the VRSF catless DP and race exhaust with plans to go stage 2+. Before all this I put in index 12’s/coded them and new NGK plugs that were gapped. Put in eldor coils as well. Also replaced boost pressure sensor and crankshaft position sensor as those were my only codes. Car ran much better but I’m still getting a misfire/hiccup when I go WOT. No limp mode/No nothing! Just that jerky stutter that makes me cringe! I just bought NGK one step colder plugs and I’m going to try and put them in before the tune and make sure they are properly gapped to .22… But if that won’t work what are my options? 1. Walnut blast 2. Clean or replace Vanos 3. Make a claim with third party warranty for a new DMI? Please man… any info or suggestions would be highly appreciated! Updated 10-6 So I loaded the MHD stage 2+ tune and the colder plugs! Still stuttering and I was mistaken as it’s not a misfire but I’m losing power somewhere during WOT. LPFP? Video below! https://vimeo.com/624987569?utm_sour...campaign=29220 Last edited by PhillyPhilly; 10-06-2021 at 09:19 PM.. |
09-18-2021, 09:54 PM | #2 | |
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If it's a misfire, you should have codes indicating this. What's this hick up, can you describe it, any logs? |
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09-18-2021, 11:05 PM | #3 |
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No logs… I haven’t uploaded the MHD yet. Basically… When I floor it and the RPM’s rise and get towards 6-7k the car will just stutter one time and I always just let off the gas when it does. It’s like one random kind of violent shake and that’s it. When I drive regular it’s fine… only when I open that throttle.
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09-18-2021, 11:21 PM | #4 |
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I once had strange issues with misfire like symptoms while getting into high boost. Turned out the injector seals were not properly seated by the dealership when they installed the index 12 injectors. I ended up buying the new seals and purchased the seal installation kit and that resolved the issue for me.
Did you perform the installation of the new injectors or was it done by someone else? Also like Saif2018 suggested an data log uploaded to datazap.me would go a long way to showing up what the car does. Ideally the log would be of an instance where the issue is present. |
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09-18-2021, 11:33 PM | #5 | |
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Also, I’m pretty new to all this but I just got my MHD OBD2 wireless adapter and I’m waiting for one step colders to arrive. Once I purchase the Super license from MHD, the data logging capabilities will be available for me correct?? Along with showing if any codes are popping up too obviously… |
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09-19-2021, 12:57 AM | #7 |
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09-19-2021, 11:47 AM | #8 |
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Drives: 09 E92 335i 6MT
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Betting it's plugs. I once received 2 defective plugs. Car would run great, get into boost and it would misfire but never threw a code unless I just kept hammering it until it did.
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09 E92 335i 6MT / Alpine White / Coral Red / VRSF 7.5" / VRSF DCI / VRSF Catless Downpipes / VTT Charge Pipe / Turbosmart RacePort Gen V / RB OEM Billet Turbos / CD919 Custom Tune / Bilstein PSS9s
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09-19-2021, 01:03 PM | #9 | |
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09-19-2021, 09:51 PM | #10 |
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Appreciate your input… Will def log and read the codes. However I DID replace the injectors already with brand new index 12’s, brand new spark plugs and brand new eldor coils. Like stated before I’m gonna try the colder plugs and set up my MHD to see what’s what.
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09-19-2021, 09:53 PM | #11 |
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I’m hoping so buddy! I got NgK one step colders en route to my address so this week I’ll swap them out and see.
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09-19-2021, 11:22 PM | #12 | |
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09-20-2021, 12:09 AM | #13 |
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Post up a log. 3rd gear WOT from 2000 rpm all the way to at least 6500 rpm.
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10-06-2021, 09:19 PM | #14 |
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10-07-2021, 12:04 AM | #15 |
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Log it!
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GruppeM CF Intake | AR Resonated DP | ER CP | Turbosmart RacePort BOV | Cobb FMIC | RB Inlets | RB External Mishi/Turner OCC | Michelin PS4 | BMW Performance Springs/Bilstein B8 + Dinan & M3 bits | BMW Brembo BBK | BMW Performance CF Spoiler | BMW Performance CF Lip | BMW Performance Alcantara | PS Designs GTS Armrest | AG H6-40 | Rear Seat Delete |
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10-07-2021, 06:30 AM | #16 |
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Nothing to diagnose without the logs.
High Pressure Fuel pump could cause this stutter you describe too. Must have logs.
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2011 335is DCT BQ Tuning / BMS CAI / VRSF kittyless DP's / Synapse BOV and charge pipe / 7" VRSF Race FMIC / Walbro 535 and 450 on BMP4 / E90 tune / Diff Brace / PR Coils / Relocation Inlets / DAW Stage3+ Turbos / MMP port injection / xHP Stage 3 / FPR and -6 fuel lines
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10-07-2021, 11:22 AM | #17 |
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10-07-2021, 11:25 AM | #18 |
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10-07-2021, 11:27 AM | #19 |
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10-07-2021, 11:28 AM | #20 |
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10-07-2021, 11:40 AM | #21 |
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Sorry, I forgot you are new to this. Upload the logs to Datazap, its a free account and then you can share the logs. This way we can manipulate the graphs to see the relevant data.
https://datazap.me/u/noguru/1-2-logs...og=0&data=3-20
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2011 335is DCT BQ Tuning / BMS CAI / VRSF kittyless DP's / Synapse BOV and charge pipe / 7" VRSF Race FMIC / Walbro 535 and 450 on BMP4 / E90 tune / Diff Brace / PR Coils / Relocation Inlets / DAW Stage3+ Turbos / MMP port injection / xHP Stage 3 / FPR and -6 fuel lines
Last edited by NoGuru; 10-07-2021 at 11:46 AM.. |
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