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      06-30-2018, 04:38 PM   #1
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Yesterday afternoon I went to start my car and heard a knocking sound. At first I thought it was an exhaust leak or exhaust rattle so I checked under the car but it sounded like it was coming from the engine bay/header area. Popped the hood and clearly heard a knock sound, took my phone out really quick to reference with video back and turned the car off. Car was running for about 3 minutes. Last time I drove the car was Wednesday, 2 days prior and I did not hear anything related to anything you hear in the video. I immediately sent the video to a few local shops here in San Diego and called Malek at MRF. Everyone told me to not drive he car and to have it towed to the shop. I decided to have it towed to MRF Engineering last night as I believe if anyone can tell me if this is savable it will be him. If anyone has any advice in this situation or had a similar problem and what their outcome is. The way I look at it from talking to Malek, either it can be saved and a simple bearing job is needed or the crank is damaged and at that point a rebuild or new engine is necessary.



History on the car: 2010 BMW M3 Coupe. 101,000 miles. 3rd owner, owned it since 65,000 miles. Car was purchased with a stack full or service and maintenance records. Very well maintained. I did oil changes with liqui moly 10w60 every 7,000 miles. I performed an oil change at 100,000 miles ago so just recently about 2 weeks ago.





Mods: stock x pipe with primary and secondary cat delete. Gintani e85 tune. Been running this tune for about 1-2 months, really hoping it's not related.





Update: Malek texted me this morning saying that based on his preliminary diagnosis, he believes I'm getting bottom end rod knock. He said it's not terrible yet, so it might be savable. It is ether rod knock or main bearing failure. He said he will be inspecting the oil next. I'll keep everyone updated.

Update #2: Malek pulled the oil pan and found that none of the bearings spun. They were severely damaged but nothing spun. He looked at the crank, pistons, cylinder walls and nothing was damaged. He looked at the main bearings and they looked fine. He said usually when main bearings start failing you will see a blue hue to them and he did not see that upon inspection. He said I am very lucky and to buy a lottery ticket lol he will be proceeding with a bearing change. I will post a picture of my bearings they look terrible lol.






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Last edited by codinge90; 07-10-2018 at 03:56 PM..
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      06-30-2018, 04:50 PM   #2
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I'm 100% sure , your situation is rod knock !
You're spot on with Malek
It's #reallysucks ! But I wish you the best of luck ..
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      06-30-2018, 05:43 PM   #3
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High mileage E9x M3 and you decided not to do your rod bearings? Big no, no.
I had 36,000 miles on mine and the rod bearings looked like ass when they came out of the engine.
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      06-30-2018, 06:04 PM   #4
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Quote:
Originally Posted by GORDON.M3 View Post
High mileage E9x M3 and you decided not to do your rod bearings? Big no, no.
I had 36,000 miles on mine and the rod bearings looked like ass when they came out of the engine.
I wouldn't consider 100k mileage high mileage necessarily. I hope this thread is not filled with posts on "why were the bearings not changed blah blah blah" because frankly that does nothing in these situations lol and adds nothing insightful to this thread.

Unfortunate event regardless though
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      06-30-2018, 06:04 PM   #5
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Sounds like crap hopefully it turns out well for you good luck!
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      06-30-2018, 06:46 PM   #6
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When mains go..does it still sound like that?
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      06-30-2018, 07:27 PM   #7
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Quote:
Originally Posted by TheRussski View Post
When mains go..does it still sound like that?
Yes . But not for a long time ...And when driven it's usually followed by a black hole !
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      06-30-2018, 07:52 PM   #8
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Quote:
Originally Posted by codinge90 View Post
I wouldn't consider 100k mileage high mileage necessarily. I hope this thread is not filled with posts on "why were the bearings not changed blah blah blah" because frankly that does nothing in these situations lol and adds nothing insightful to this thread.

Unfortunate event regardless though
People are asking because it's been a topic of discussion for the past 4-5 years, and now a class action lawsuit against BMW. So people are asking because they're wondering if you're new and not aware of the rod bearing problem, or did know and chose to ignore it.
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      06-30-2018, 08:18 PM   #9
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Quote:
Originally Posted by codinge90 View Post
I wouldn't consider 100k mileage high mileage necessarily. I hope this thread is not filled with posts on "why were the bearings not changed blah blah blah" because frankly that does nothing in these situations lol and adds nothing insightful to this thread.

Unfortunate event regardless though
Fear drives behavior. I find it irresponsible when someone assures everyone RB failures are miniscule - less than 2% - and encourage people not to change out their RBs.
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      06-30-2018, 08:28 PM   #10
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I agree with you guys but you have to understand that any thread with a similar issue like mine is people non stop posting asking why the bearings weren't changed. How does this help my situation? I completely agree the issue is relevant and possibly getting worse as time goes on but in my thread you can clearly see my intentions for responses were more on line with anyone that has had a similar issue and what their outcome was. Was engine able to be saved? Was a simple bearing job necessary? Was the engine replaced? If so, how much was the total cost and how long was the car out?
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      07-01-2018, 08:35 AM   #11
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Your car is in good hands. Good luck.
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      07-01-2018, 08:58 AM   #12
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Your car is in good hands. Good luck.
Spot on !
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      07-01-2018, 12:38 PM   #13
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I feel like I've had this noise before, very similar consistent tapping sound after a long drive and heard it while idling. But now it's gone. Is it possible I can have a similar engine issue? I've already swapped my rod bearings
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      07-01-2018, 12:50 PM   #14
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Quote:
Originally Posted by Youngh View Post
I feel like I've had this noise before, very similar consistent tapping sound after a long drive and heard it while idling. But now it's gone. Is it possible I can have a similar engine issue? I've already swapped my rod bearings
Negative ! Once you get rod knock , it goes never away .Only worse ! And your S65 is RIP !
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      07-01-2018, 01:19 PM   #15
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Quote:
Originally Posted by ///M Power-Belgium View Post
Quote:
Originally Posted by Youngh View Post
I feel like I've had this noise before, very similar consistent tapping sound after a long drive and heard it while idling. But now it's gone. Is it possible I can have a similar engine issue? I've already swapped my rod bearings
Negative ! Once you get rod knock , it goes never away .Only worse ! And your S65 is RIP !
Whew thanks. Good to know
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      07-02-2018, 01:05 PM   #16
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Quote:
Originally Posted by codinge90 View Post
I agree with you guys but you have to understand that any thread with a similar issue like mine is people non stop posting asking why the bearings weren't changed. How does this help my situation? I completely agree the issue is relevant and possibly getting worse as time goes on but in my thread you can clearly see my intentions for responses were more on line with anyone that has had a similar issue and what their outcome was. Was engine able to be saved? Was a simple bearing job necessary? Was the engine replaced? If so, how much was the total cost and how long was the car out?
He has a point, popping in and saying what should'a been done isn't going to help the OP. I never had to deal with a rod knock and my previous M3 had the RB's done, my current M3 does not have it done (yet). OP, a friend of mine with an 2012 M3 and 78,000 miles got a rod knock and the car was taken to an Indy shop in Toronto, his was engine was saved. You caught it just in time so I would lean towards you are likely safe regarding replacing the whole block.

Good luck and you have the car in a superb shop and if anyone can save it, it's Malek.
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      07-02-2018, 02:13 PM   #17
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Quote:
Originally Posted by cmyE93M3 View Post
Quote:
Originally Posted by codinge90 View Post
I agree with you guys but you have to understand that any thread with a similar issue like mine is people non stop posting asking why the bearings weren't changed. How does this help my situation? I completely agree the issue is relevant and possibly getting worse as time goes on but in my thread you can clearly see my intentions for responses were more on line with anyone that has had a similar issue and what their outcome was. Was engine able to be saved? Was a simple bearing job necessary? Was the engine replaced? If so, how much was the total cost and how long was the car out?
He has a point, popping in and saying what should'a been done isn't going to help the OP. I never had to deal with a rod knock and my previous M3 had the RB's done, my current M3 does not have it done (yet). OP, a friend of mine with an 2012 M3 and 78,000 miles got a rod knock and the car was taken to an Indy shop in Toronto, his was engine was saved. You caught it just in time so I would lean towards you are likely safe regarding replacing the whole block.

Good luck and you have the car in a superb shop and if anyone can save it, it's Malek.
Thanks for the post! Do you know the details of how it was saved? Did the Indy shop just have to replace the bearings or anything else was repaired/rebuilt?
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      07-02-2018, 03:08 PM   #18
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Also if anyone wants to chime in and let me know how much they think my car would sell for with rod knock? I'll post some pictures up as it's atheistically very modded, probably won't affect the price very much. Can't find anything online with either a blown engine or rod knock engine so I don't know how it'd be priced.
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      07-02-2018, 03:15 PM   #19
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Good luck, hopefully the motor is savable! Sucks to see a fellow San Diegan deal with RB issues.
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      07-02-2018, 04:33 PM   #20
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Quote:
Originally Posted by codinge90 View Post
Quote:
Originally Posted by cmyE93M3 View Post
Quote:
Originally Posted by codinge90 View Post
I agree with you guys but you have to understand that any thread with a similar issue like mine is people non stop posting asking why the bearings weren't changed. How does this help my situation? I completely agree the issue is relevant and possibly getting worse as time goes on but in my thread you can clearly see my intentions for responses were more on line with anyone that has had a similar issue and what their outcome was. Was engine able to be saved? Was a simple bearing job necessary? Was the engine replaced? If so, how much was the total cost and how long was the car out?
He has a point, popping in and saying what should'a been done isn't going to help the OP. I never had to deal with a rod knock and my previous M3 had the RB's done, my current M3 does not have it done (yet). OP, a friend of mine with an 2012 M3 and 78,000 miles got a rod knock and the car was taken to an Indy shop in Toronto, his was engine was saved. You caught it just in time so I would lean towards you are likely safe regarding replacing the whole block.

Good luck and you have the car in a superb shop and if anyone can save it, it's Malek.
Thanks for the post! Do you know the details of how it was saved? Did the Indy shop just have to replace the bearings or anything else was repaired/rebuilt?
Completely rebuilt the engine but saved the block. From memory, it ran him $6,800. Less than the $10K for a used replacement (engine).
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      07-02-2018, 04:39 PM   #21
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Quote:
Originally Posted by codinge90 View Post
Also if anyone wants to chime in and let me know how much they think my car would sell for with rod knock? I'll post some pictures up as it's atheistically very modded, probably won't affect the price very much. Can't find anything online with either a blown engine or rod knock engine so I don't know how it'd be priced.
Whatever your car is worth less a replacement engine I would guess. Any buyer would go worst case scenario purchasing a car with rod knock.

Selling the car in this condition would not be remotely close to ideal for you. Maybe better parting the car out. If you can swing it, it's best to repair it and enjoy the car a few years longer than you may of normally.
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      07-02-2018, 04:42 PM   #22
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Quote:
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Quote:
Originally Posted by codinge90 View Post
Also if anyone wants to chime in and let me know how much they think my car would sell for with rod knock? I'll post some pictures up as it's atheistically very modded, probably won't affect the price very much. Can't find anything online with either a blown engine or rod knock engine so I don't know how it'd be priced.
Whatever your car is worth less a replacement engine I would guess. Any buyer would go worst case scenario purchasing a car with rod knock.

Selling the car in this condition would not be remotely close to ideal for you. Maybe better parting the car out. If you can swing it, it's best to repair it and enjoy the car a few years longer than you may of normally.
I would definitely part out some of the parts but I would only recoup maybe $2000. I don't plan on replacing the engine at the moment, I planned on getting rid of the car within a year and I don't owe a lot on the car at the moment so I would hope to break even if I can sell it. We'll see though if Malek tells me it savable and it won't be extremely expensive I'll go that route and keep the car for a year or 2 more.
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