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09-27-2009, 11:30 PM | #23 |
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I had the same problem. Started running 76 100 octane fuel, sound went away. Must admit, I was also using Shell and each time it sounded worse and worse.
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09-28-2009, 11:01 PM | #24 |
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I've been running a steady diet of Shell V Power. Guess I drank the Kool Aid. The last couple weeks I've been noticing some mild drivability problems. Slight backfiring when I back off the throttle, a little bucking when cold, occasional momentary drop in power under WOT. Almost like fouled plugs or (shudder) carbon deposits.
I'm going to give it what we used to call an "Italian tune up" tomorrow (probably waaaaay too politically incorrect these days). Will also switch from Shell and see if that makes any difference.
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10-07-2009, 02:59 PM | #25 |
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Rovman, thank you for your excellent account of the knock problem. I have 6000 miles on my convertible '08 M3 and for the last couple of weeks I am getting this weird very frustrating cheap car kind of knock every time I try to accelerate from lower speeds on 2nd or 3 rd gear, especially when there is a slight incline. True, I have been filling 93 octane Shell gasoline lately more consistently, though occasionally in the past without problems. I switched back to Mobil but the problem persists, very disheartening indeed. I have an appointment with the service department next week, but I do not want to go through what you had to go through, and I do not want them to tell me it is "nothing" either. First, can you give me an update on your M and the knock problem current situation, fully resolved or is still rearing its ugly head? Second, what would be my approach to service personnel regarding this, so I can cut the crap?
Thank you for your advice and time. Last edited by Amrrrrr; 10-07-2009 at 03:09 PM.. Reason: spelling |
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10-08-2009, 10:20 AM | #26 |
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How does a cheap car kind of knock differ from an expensive car kind of knock? Can you describe it? Do you feel a loss of performance or are you just hearing knock with your ear?
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10-08-2009, 12:00 PM | #27 |
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By that I meant it is unbecoming of the M3 and it never happened under similar conditions of driving before. The performance is transiently worse. But it is the new noise that is more persistent and annoying.
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10-08-2009, 12:58 PM | #28 |
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After reading this thead, my question is how effective is the in-plug knock sensor on EACH cylinder of the M3 engine? Compared to 1 or 2 (1 per bank) sensors on other engines, this one has EIGHT (one per cylinder). It's supposed to be the perfect solution to knock/ping. Just curious. Or maybe it's something else, like a loose cam chain (bad tensioner)???
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10-13-2009, 09:04 AM | #29 |
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Mine is still knocking and pinging away. I have tried Shell, BP, Mobil, and of course Sunoco with no change whatsoever. I have even tried a couple tanks of 91 and it knocks just as much as with the 93. Trying a different dealer next week...hopefully their service dept will figure out what is wrong. Just thinking about what "elp" said about the knock sensors...why won't the dealer just try replacing the plugs to see if that makes a difference? I am so frustrated.
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10-29-2009, 06:47 PM | #30 | |
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Glad to know it's as intended, albeit not the best sound.
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10-30-2009, 08:41 AM | #31 | |
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Drives: '09 E92 M3 IB/'17 f85 X5M LBB
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10-30-2009, 11:41 PM | #33 | |
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new car doesn't have that |
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11-01-2009, 12:42 AM | #34 | |
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What was the rationale for using the lemon law? Was the car not performing to its specs and BMW NA was not able to fix it? Any threads on this? Thanks.
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09-22-2010, 01:38 AM | #36 |
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I've had nothing but bad experiences with Shell.
It sent my supercharged 330 into limp mode. And it's sent a couple 335's into limp mode as well. I avoid it at all costs and only use Chevron or 76. On the east coast I used Sunoco 94/93.
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05-30-2011, 10:53 PM | #37 |
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bump any solution on this?
what exactly does the knock feel like? my car has been feeling weird in gear 1 when i floor it above 4k. theres a weird sound coming from engine bay under this circumstance |
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05-31-2011, 01:00 AM | #38 |
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DINAN has software for this. It retards timing only in the specific range and claim there is no power loss. I have not tried it yet because I have to send my ECU overseas.
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05-31-2011, 02:25 AM | #39 |
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1 it's exacerbated by aftermarket filters. You can really hear it when going from wot and abruptly lifting off the accelerator at 32-3300 rpm. I think it's a vanos related noise kinda like VTEC aha
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05-31-2011, 02:32 AM | #40 |
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05-31-2011, 08:19 AM | #41 | |
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05-31-2011, 11:06 AM | #42 |
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I get the same thing around 3k-5k when the oil temp is on the colder side, It tones down considerably once the car has warmed up to 100 canadian (210F) to almost nothing
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05-02-2012, 01:01 AM | #43 |
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Bumping this thread for some others insight. Since I have had my car, I notice a very slight audible knock when the car is under a light load (say 2k rpm in second gear @ 75% throttle) for 1/2 a second on throttle input. It is very slight, and all diff brands of gas don't seem to matter. Dealer thinks I am crazy (car is under warranty, nothing's been done) and I know what I hear. Again a light knock under a light load that goes right away, I'm stumped. Considering the elaborate knock sensor design on this car, it is kind of odd.
Anyone Else? Please let me know after you drive your car. Again, both my M cars have sounded like sewing machines (normal) but this is a little odd. |
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