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HELP!! Possible N55 Engine Failure! VIDEO!
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05-15-2017, 02:14 PM | #1 |
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HELP!! Possible N55 Engine Failure! VIDEO!
My car recently has developed some sort of knocking sound coming from the engine. Sounds like a bad connecting rod or rod knock. Car is a 2011 BMW 335i with the N55 engine with 85,000 miles. Owned the car since 60k and changed oil every 5k with Castrol Edge 0W-40. At this point, it's financially smarter for me to avoid a used engine if I can. I still owe 10k to the bank. If it was the rod bearings or connecting rods will I be able to just replace those and keep changing the oil for lets say 500 miles for a few months or until there's no more metal? A used engine will go around for 5k. I've been quoted 4k in labor to install it. Then again I have the chance into running into more problems. I'm in a really tough spot and I REALLY need some help. Thanks.
https://www.youtube.com/watch?v=yMeokNp6ppc |
05-15-2017, 02:19 PM | #2 |
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Stop driving it.
Have it checked out by a qualified mechanic or if money is a concern right now, spend $28.00 and send a sample of the oil to Blackstone laboratories. The Vanos bolts were and issue on some years of the N55 so you might want to see if your VIN is part of that recall (my 2011 335i was not). I'm not sure what it sounds like when that issue shows up. |
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05-15-2017, 02:25 PM | #3 | |
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05-15-2017, 02:41 PM | #4 |
Clean is the new cool, keep it that way.
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Ah okay, and you said you changed your oil every 5k, have you noticed any consumption between those oil change intervals? Any chance you ran it low on oil? I do 5000 mile oil change intervals and I always have to add at least a quart, even more if I go on a few hard drives thru the hill country.
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05-15-2017, 02:50 PM | #5 | |
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05-15-2017, 03:08 PM | #6 |
Clean is the new cool, keep it that way.
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I think that is pretty normal, mine has always required oil to be added. I'm at 80k now. Sounds to me like it could be a fluke. Is your car tuned?
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05-15-2017, 03:47 PM | #7 |
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Take it for diagnostic or scan for codes. Codes will tell you a lot.
A true engine failure is nearly immediate loss of oil pressure and a seized engine. This is not your problem. I'll give you a ray of hope here, hopefully you have some sort of fuel / ignition issue and the sound you hear is one or more cylinders not combusting. Typically a rod knock will not give you any codes related to combustion, and the video clearly shows the half engine warning light and codes. To answer your other question, no on this engine it is typically not worth trying to replace just the crank bearings, or connecting rods. You are usually better off with a used engine.
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05-16-2017, 12:38 PM | #8 | |
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Last edited by Mean E92; 05-16-2017 at 12:44 PM.. |
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05-16-2017, 12:51 PM | #9 |
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Have you investigated at all where the noise is coming from in the engine bay?
I'm listening on cheap laptop speakers but to me it almost sounds like you have a horrible exhaust or intake leak. Or like maybe one of your injector hold down clamps came loose and two of your injectors popped out. I'm not exactly sure how the injectors are held in so this is just a hypothetical. Could also maybe be a fluke fuel pump, low or high pressure. When the noise started, was it sudden? What were you doing when the noise started? Did any other noises happen?
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05-16-2017, 01:07 PM | #10 | |
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05-16-2017, 01:13 PM | #11 | |
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Best of luck!
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05-17-2017, 01:47 PM | #13 |
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05-17-2017, 02:31 PM | #15 |
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05-17-2017, 11:39 PM | #16 |
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05-18-2017, 11:23 AM | #17 |
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05-19-2017, 07:36 AM | #19 |
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Exhaust leak
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05-19-2017, 06:08 PM | #21 |
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Shop got back to me and told me it's mechanical. They said it's a spun rod bearing. They didn't drop the pan. Still don't know how this is possible. They then told me they removed JB4 because it was making the car have starting problems. They also compression tested the engine. Apparently 2 of the 6 cylinders aren't balanced. I asked why they couldn't just change the rod bearings and they said that the clearance would be too much. I'm sending it to a well known highly respected BMW only shop next week to see what they say. All of this still dosent add up to me.
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