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07-06-2014, 06:52 AM | #221 |
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"VANOS GEARS !"
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07-06-2014, 08:54 AM | #222 |
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I'm hearing the same noise from my car about 50%of the time
but the noise is lot less apparent after i made the switch to 0w40 have you thought about maybe noise is coming from second chain linked to the oil pump? upper chain guide is held by tensioner, idk if tension is created by oil pressure or just spring by it self. its just a theory but i think its worth checkin before going into vanos gears. |
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07-06-2014, 01:49 PM | #223 | |
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worth checking out.
i will look into all of this once i return from vacation, leaving in 2 days. so all of this has to take a pause. during that time dont take my absence from the topic as a sign that i have given up i'll be back at it sometime near the end of july. simply not much i can do while on vacation Quote:
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07-19-2014, 08:25 PM | #224 |
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Metallic knock.
M3PO has provided the solution.
My car is experiencing the same thing. My post. http://www.m3post.com/forums/showthread.php?t=1012547 It's still under original warranty.. So I'm taking it in about 1.5 weeks so that it can be documented (if they refuse.) and/or repair. This is preventive measure.....just like preventive medicine. A clog artery may function fine....but overtime function will decrease....eventually....leading to complete obstruction and failure (heart attack).....or in this case....a BLOWN engine.. lol PLan to to provide M3PO invoice...... I may even take it to Irvine BMW. |
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07-19-2014, 09:02 PM | #225 | |
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please let everyone know how it goes.
i am currently on vacation, although peeking in here every few days to see if anything new develops on this subject. once i return home im going to have the vanos done, but would REALLY like to see 2 people use the same solution before i jump in on a multi-$$$$ repair. thanks for the notify! Quote:
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07-19-2014, 11:22 PM | #226 |
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i'm tired of hearing this clank noise and planning to replace the vanos gears
but how do you know which one is bad vanos gear out of 4 should i just replace all 4 of them at once? |
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07-20-2014, 11:56 AM | #227 |
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I could have sworn that I heard my car make the valve clack noise the other day, but I just did a recording (with a good quality 25mm diaphragm condenser mic) and didn't hear it at all. I figured I'd provide the recording for you guys, so you have a point of reference (a baseline, really) for an M3 startup without the sound. Just in case anyone tries to tell you "it's perfectly normal".
The MP3 file is compressed at 192 kbps fixed bitrate, but I only have the (pretty crappy) LAME MP3 encoder, so I provided uncompressed formats if someone needs to do in-depth analysis. The WAV file should play on just about anything. The FLAC file is a "lossless" compressed format. 2013 M3 Startup MP3 format (433 KB) 2013 M3 Startup WAV format (1.6 MB) 2013 M3 Startup FLAC format (1.2 MB)
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07-20-2014, 12:57 PM | #228 | |
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Quote:
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07-20-2014, 03:44 PM | #229 | |
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hi bradley.
thank you kindly. im sure this will help those going to warranty with this issue. how many km on your motor btw? production year? id like to see the response from those who say this noise is normal after listening to your recording and mine / all the others side by side clearly there is something on motors that exhibit this noise that is maladjusted / misshaped / broken. Quote:
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07-20-2014, 03:58 PM | #230 | |
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Sounds perfect
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Sounds normal. Look at my post. You can hear the clunk sound perfectly. |
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07-20-2014, 04:00 PM | #231 |
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thats the thousand dollar question
i have to be honest, to this date, i have no idea which side its coming. i bought 2 stethoscopes so i could left ear = passenger side vanos, right ear = drivers side vanos the startup sequence but got in an argument with my gf both nights i had everything ready (remember, gotta wait 6+ hours at least to hear the noise etc etc etc) so i have yet to do this. the one time i had my head under the hood, with the intake manifold removed, the noise sounded like it was coming from the drivers side valve area. although, there were so many noises at once, i would take that with a serious grain of salt. if you (or anyone else for that matter) get this done via warranty or on their own, let me know the procedure they used to diagnose what side it was coming from |
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07-20-2014, 04:39 PM | #232 | |
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Copy of M3PO.... Hope this will help .
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07-20-2014, 05:37 PM | #233 | |
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Quote:
Last 7 of VIN: J593425 Model year: 2013 Production date: 28.09.2012 All oil changes performed at the dealer, so it's running whatever they'd put in it.
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07-20-2014, 05:39 PM | #234 | |
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Basically, if anyone tries to tell you that the clunk sounds normal, they're full of it, and this audio is the proof.
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07-20-2014, 09:21 PM | #235 | |
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Based upon all of the forum discussion on this topic, and all who have chimed in to say they've experienced, it can be reasonably concluded that it's not outside of the norm to have the noise. "Normal" as in what M expected? Can't say. Both of my E90s (separated by 2 model years and 25k miles) have it. If it was truly a rare issue, the chances of that I'd acquire 2 of the uniquely afflicted are slim to none. Others have also had two E9Xs with the issue. Also can be reasonably concluded based upon the available data that it is not indicative of a near term or long term serious (or even minor) engine issue. All of that said, I certainly hope we get confirmation on the Vanos cause. If so, what characteristics of the used Vanos are creating the noise, and are they in some way compromised? Considering this occurs on cold starts, and most commonly after the vehicle sits for a while, I have a suspicion this is much to do about a lubrication issue...
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07-21-2014, 08:04 AM | #236 | |
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Ok good to know...But now,and i've said it before... So pulling the Vanos Gears Bank 1-4 out ,and put the same of the factory Vanos Gears back in ,and this is the fix with the same Vanos Gears of the factory ? It's almost like pulling a problem out and put the same problem back in ?!?! Something is just not right ...and personal i'm thinking it's more like backlash of the Vanos Gears and creates the clunck noise during the start up ! And it's just that i don't get ??? Same thing is with the brake procedure for DCT's each time when i'm doing this i've no clunck noise ? And maybe it's a sign that the Vanos Gears have the necessary time to tension (during the 30 sec.brake procedure) and so there is no clunck noise ? Not sure about this and so maybe i'm wrong.....but it seems that way !
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07-21-2014, 09:09 AM | #237 | |
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Does anyone know if Vanos relies on the vacuum system at all?
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07-21-2014, 10:51 AM | #238 | |
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Note ; i've done this only with the keyfob in ! That being said i'll will try to start the car ,but first i'll wait 30 secondes to pusch the start button without the brake procedure, only then we should know that brake procedure is involved or not . I've had the clunck noise for time period of 2 years and now i've start with the brake procedure it's gone.... ,i've don't heard it anymore ?!?! I'm continue to dig about this mystery....
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07-21-2014, 01:00 PM | #239 | |
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I am not claiming that your brake pedal procedure has no effect on the noise, I'm only claiming that it can have no effect on Vanos. The brakes in your car simply aren't connected to anything that affects Vanos. The caveat being vacuum systems. Brake actuation absolutely has an effect on vacuum. I just don't know whether Vanos relies on vacuum. Most variable valve technology operates from oil pressure, because vacuum is too weak to reliably actuate the mechanisms.
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07-21-2014, 03:45 PM | #240 | |
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My 6MT sits for about 1 week at a time or slightly more right now, so every time I start it it's a prime opportunity for the infamous clunk/grind. And indeed for each of the prior 4-5 weeks I experienced it on the cold start. Tried the brake routine last week and perfect cold start, no clunk. I'll try again this week to verify. I have no idea what the possible interaction is between the brake system and this noise! Comfort access for me, btw. Key fob not in.
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07-21-2014, 06:17 PM | #241 | |
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BTW...about the "misguidance" of the brake procedure , it was the same here ! But thought...why not... i'll try it ! Thought also that it only works for DCT , but see now your car is 6MT ? The result you know by now....
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BPM DEV-Tune & DCT Software-Tune & Servotronic & coding ///Alpine HID Angeleyes ///Oem.exhaust mod. Last edited by ///M Power-Belgium; 07-21-2014 at 06:25 PM.. |
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07-21-2014, 06:23 PM | #242 | |
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