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01-10-2012, 10:44 PM | #89 |
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I'm going to listen to these videos when I get home..
My M3 is 12/2007 build, one of the early ones... Almost 38K on the clock and running stronger than ever. I was at the track a couple weeks ago and the instructor couldn't lose me in a new Z06 with 345 tires! |
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01-10-2012, 10:46 PM | #90 | |
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01-11-2012, 12:17 AM | #91 |
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+1 I'm willing to bet that this is fairly common and people either don't notice it or think it's normal. I didn't realize mine was doing it until I stopped driving it daily over the holidays.
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01-11-2012, 10:49 AM | #92 |
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Was there any resolution to what this sound is on our cars? From what I have read, it sounds like this may be the VANOS versus the videos of the loud sound at startup, which is something more serious. If it's the VANOS, is it a major concern or something that can be lived with for years, and miles, to come?
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01-11-2012, 07:53 PM | #93 |
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01-11-2012, 08:25 PM | #94 | |
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01-12-2012, 03:30 PM | #95 |
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Little bit of an update on mine. Like I said, mine doesn't do it unless I stop driving it every day. So I'd suggest people who DD think about letting it sit for a couple of days and then listen for this.
It is a real problem. My dealer acknowledged the problem after letting it sit for 2 days and starting it. They have contacted BMW asking how to proceed. I'll update when I know more. |
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01-14-2012, 11:33 PM | #97 |
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BMW will be replacing both timing chain tensioners on my car this week. Apparently, it is not a problem with the VANOS system because they disconnected the VANOS solenoid (Iirc) and the noise was still present.
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01-15-2012, 12:38 PM | #98 |
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Sounds like the same route they took with mine...in my case, that didnt work. Hope it does for yours!
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01-16-2012, 01:10 PM | #99 |
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01-16-2012, 01:33 PM | #100 | |
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the engine noise can be lack of lubrication to the lifters, it very common, even more so with M3's in 6MT. |
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01-18-2012, 11:49 PM | #101 |
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what do you guys think is the cause of the noise?
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01-19-2012, 11:30 AM | #102 |
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I personally believe that it sounds like timing chain slap. There are valves on the hydraulic timing chain tensioners that hold in oil pressure to keep the chain tight while the engine is off. If the valves on the tensioners go bad, the oil pressure will bleed off allowing the chain to become a little loose. When the engine first starts and oil pressure is low, the chain will rattle until oil pressure builds up and reapplies pressure to the tensioners and chain.
BMW seems to agree. They are changing my timing chain tensioners as we speak. However, another member posted that this didn't solve his problem. In one case, replacing the VANOS check valves seemed to do the trick but that didn't work in another. From what I understand, there are pins on the VANOS that lock the system in place when the engine is off in which case the check valves don't come into play at start up. Again, my dealer/BMW seems to agree with this. They disabled the VANOS system (disconnected the VANOS solenoid IIRC?) and the problem was still present. edit: I should also mention that nothing suggests that this is a bearing issue. |
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01-19-2012, 02:08 PM | #103 | |
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- VANOS check valve replacement - All tensioners and belts on the front of the engine - Cam chain and tensioners - Bottom end bearings and crankshaft - Front exhaust section None worked. That was my car in particular of course - so it doesn't mean some of these ideas won't fix another. Each time the foreman went through their next course of action with me, it sounded completely right and feasible - but never worked. I hope they learnt was the issue was from taking apart my old engine and have formulated a plan to rid the noise in other cars in the future (should it show)
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01-19-2012, 03:16 PM | #104 | |
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01-19-2012, 08:25 PM | #105 |
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I'm really keen to hear how your one goes!
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01-25-2012, 02:19 AM | #107 | |
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Same path they took with mine.
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01-25-2012, 02:22 AM | #108 |
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02-03-2012, 05:27 PM | #110 | |
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The E46 m3 and e39 M5 are notorious for vanos noise especially in higher mileage - haven't heard of too many e9x M vanos issues, but it could be a matter of age/mileage. We might hear a lot about this 5 years down the road... |
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