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BMW 3-Series (E90 E92) Forum
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N55 rod knock/spun bearing tracking
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02-24-2020, 07:04 AM | #353 | |
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I believe that some other owners (with a louder version of this noise) said it had to do with the vacuum pump. I have put off doing any repairs as it's just not significant enough. |
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Marq_z9.00 |
02-24-2020, 11:55 AM | #354 | ||
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02-24-2020, 12:00 PM | #355 | |||
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That's just the Transmission Control Unit logic (TCU) |
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02-24-2020, 02:10 PM | #356 | ||||
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03-08-2020, 12:22 AM | #357 |
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2011 e93 n55
103xxx knocking motor think I spun a rod bearing , changed oil roughly 1000-2000 miles liquid moly 5w30 in summer 5w40 in winter at the time of incident I was running mobil 5w30 smh
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04-08-2020, 09:03 PM | #358 |
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05-31-2020, 03:36 PM | #359 |
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My 2nd 2011 n55 engine has also got rod knock https://www.e90post.com/forums/showthread.php?t=1725430
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06-24-2020, 09:57 AM | #360 |
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Chiming in here, 2012 MY, 11/2011 build, 135 just ate a rod bearing at 113,000 miles. I just did the OFHG and OCHG, let it idle and warm up, took it for a 10 mile drive or so everything seemed fine, went to a track day and like three laps in, boom. I got three different codes for super knock on cyl 3, but maybe that was just the bearing clattering?
I've owned it since 2016 when it had 102,000 miles. Oil has been Castrol 0W40 every spring, and every 5-6 track days, not much history on it before my ownership but it looked well maintained, the oil pan and head are super clean. I've been running MHD Stage 1 for pretty much the entire time I've owned it. |
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06-24-2020, 05:49 PM | #361 | |
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2. Had high mileage (100k+) - check 3. Was tuned on an OTS map - check 4. Changed the oil once a year - check 5. Used 40 weight oil - check 6. Recently changed OFHG - check 7. Tracked the car - check Do you happen to go above 3k rpm in the morning (oil temp below 190) as well? Rod bearings are a wear item. Your rod bearings must've been on its way out. My theory is some debris or air that got in during OFHG change must've put a nail on the coffin of your dying rod bearings.
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2011 E92 335i xDrive
Pure Stage 1 | DV+ & Inlet | Injen Intake | M3 Cowl | ETS 5" FMIC & CP | Aquamist HFS4 Direct Port | CSF Radiator | Wagner Catted DP | BMW PE | Apex FL-5 | Michelin PS4S | 335is Engine mount | SDW Monoball thrust arms | UUC Swaybars & SS Brake lines | Bilstein B8 | Dinan Springs & Shock mounts | Whiteline RSFB | M3 Rear Control arms | Manzo Toe arms | Wavetrac LSD |
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06-25-2020, 07:19 AM | #362 | |
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Also when it went I got a bunch of codes for super knock and then cyl 3 deactivation so I’m not convinced it was because of the OFHG but who knows. My leading theory is bad gas leading to super knock and then the rod bearing failure. |
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06-26-2020, 10:30 PM | #363 | |
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06-26-2020, 10:36 PM | #364 | |
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06-28-2020, 11:32 AM | #365 | |
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Across the last two years I had a few super knock codes because I overboost at 28 psi and nobody knows what to do about it, but my bearings are still holding up. Like Supermoon mentioned, I still think it has something to do with air entering the feed system or a lubrication handicap. Anyways, sorry to hear about this and I hope you get to fix it.
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TOTALED | 2011 E90 335i xDrive - BMS Cold Air Intake - ETS Charge Pipe - ETS 7" FMIC - MHD Stage 2+ - GFB DV+ - PE Mod - VRSF Catless Downpipe - xDelete - xHP Stage 3
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08-17-2020, 10:31 PM | #367 |
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2011 e90. 117k miles. Engine still runs. Will be pulling the pan to see how bad it is.
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08-22-2020, 05:37 PM | #368 |
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Member of the MiamiBimmerClub was driving his e92 n55 and said it just turned off, he sent a video and I had to break the news his engine is seized. His mechanic reassured him that it is in fact seized. What a junk platform, think that I got an n55 instead of n54 to deal with less problems and ended up with two seized engines.
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08-22-2020, 10:01 PM | #369 | |
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Sometimes this life, I swear.
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TOTALED | 2011 E90 335i xDrive - BMS Cold Air Intake - ETS Charge Pipe - ETS 7" FMIC - MHD Stage 2+ - GFB DV+ - PE Mod - VRSF Catless Downpipe - xDelete - xHP Stage 3
2015 E84 X1 35i M-Sport |
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08-24-2020, 11:25 PM | #371 |
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also a victim
My #6 piston spun at 90K miles. Can't afford to purchase a used engine so I try to salvage it and planning to replace all rod bearings this week. Hope it works.
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08-25-2020, 10:10 AM | #372 |
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While I'm certain preventatively replacing rod bearings is not the right decision for everyone, for me and my goal of keeping the car in good working order for years to come - and especially after seeing what condition mine were in after only 72K miles, it was more than worth it. ~15K tuned miles later and still running strong!
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08-25-2020, 02:19 PM | #373 |
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08-25-2020, 10:44 PM | #374 |
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