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03-24-2020, 08:58 PM | #1 |
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135i N54 ghost misfire on high boost/gear
I've tried to track this issue down for a little bit.
Car boosts fine and pulls hard on startup in 1st/2nd gear. Once I get into higher gear it throws the half CEL light and boost cutoff/limp mode. The service engine light pops on for 5-15 seconds and then goes away once I stay off boost. When the half CEL and SES light comes on the car starts sputtering/misfiring hard when under load. Once the car drops speeds and is out of boost the codes and half CEL light go away. I scanned the car and checked JB4 for codes and there's nothing showing. Car is FBO, not running meth. I did bottom out a little bit ago and I'm wondering if my FMIC piping isn't on all the way... I'll have to check that tomorrow. I did remove the chargepipe and clean it/tighten all connections. When the half CEL light stays on I can restart the car, it goes away but the car is still barely boosting and feels like it's NA. I do think the boost solenoid might be going bad as I hear a weird tapping noise as seen on a video, could that be the cause of this issue? Could it be something like plugs/coils? Injectors are Index11 and HPFP is newer. It doesn't feel like fuel cutoff Someone help!!!! |
03-24-2020, 10:27 PM | #3 | |
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EDIT-- I do have a DKAN cable, I'll probably cave in and get MHD just for logging etc. Last edited by iEatSand; 03-24-2020 at 10:34 PM.. |
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03-25-2020, 09:22 AM | #5 | |
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What trans do you have? I have the DCT and had this issue on my car after I installed the PS2 and had boost >16 at about 6200 rpm. This is a known issue with the DCT.
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Jim
2011 135i DCT - FBO PS2 1Mpostr Last edited by JPuehl; 03-25-2020 at 12:41 PM.. |
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03-27-2020, 04:37 PM | #6 |
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The issue was resolved. I removed all the intake, chargepipe, FMIC, and cleaned/reinstalled it. Checked for leaks on all vacuum lines. Car has been running strong for 3 days. No CEL, no half-engine light, can floor it in 3rd/4th gear at 3k and no issues. Car is finally mechanically solid! Just needs some PDR and bodywork to be back in perfect condition. Honestly happy with the quarantine so I can get stuff done on the car. Might be selling my 335i today so more money for fixing up the 1er
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03-27-2020, 04:39 PM | #7 | |
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As for the trans it's a 2008 automatic, I don't think they had a DCT in 2008. I'm planning on getting a parts car and doing a manual swap. |
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03-29-2020, 11:48 AM | #8 |
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Probably a tuning issue like MHD. Ever since I stopped running stage 1 or 2+ I get no misfires bc I'm on a custom tune. Mine wouldnt misfire for couple days at times but than would start doing bvn it again.
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