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05-15-2018, 01:40 PM | #1 |
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Pinging mystery
Lately I've had occasional pinging (pre-detonation, valve clatter, whatever). It's intermittent, on sudden acceleration, in 3rd or above, at 2500-3500 rpm, especially uphill. The sound is a quick or (uphill) an extended "zzzzt," the classic marbles in a can. Pinging can of course cause engine damage.
The history:
The only relevant M3post thread I could find is here, posts 42 and 49: http://www.m3post.com/forums/showthr...OzCraig&page=3 Two members (Aviato and OzCraig) fixed what seems like the same problem by replacing the low fuel pressure sensor. But they had related fault codes. Other possibly relevant notes:
Given all that, what do you think may be the problem, and what's a possible fix? Should I just go ahead and replace the LFPS, even with zero fault codes? Thanks for your thoughts, Craig (AKA Megabrode)
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Analog 2011 e92 M3 | Jerez Black | Black Novillo | 6MT | CF roof | No iDrive, Nav, M button, ZCP, EDC, or center hump | ZHP shift knob | OMP 1010 pedals | K&N filter | Dinan engine tune | OEM exhaust mod (bypass) | EAS exhaust tips | shaved front bumper | 19" Apex EC-7 | 12 mm rear spacers
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05-15-2018, 01:43 PM | #2 |
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I'd temporarily remove the tune and see what that does. Can you easily do that?
Any access to datalogging? If so, there are a ton of variables you could look at like timing advance/retard, O2 sensor values, etc.
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05-15-2018, 01:51 PM | #3 | |
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But no access to data logging AFAIK.
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05-15-2018, 01:58 PM | #4 | |
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In any event, switched to Chevron while back and do not hear the noise anymore. Did try Shell again briefly and noticed the same noise. So could be noisy injectors which are getting a bit cleaned up when using Chevron with Techron? |
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05-15-2018, 03:10 PM | #5 | |
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Your injectors are already very clean from years of premium fuel. Switching to Chevron on one tank is not going to magically release a ton of crap.
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05-18-2018, 07:02 PM | #6 |
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The mystery continues: I've done nothing to the car except thrash it all afternoon...and the ping is gone.
Maybe my daddy was right: "Son, every once in awhile you need to blow the baked-on carbon out of there."
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05-18-2018, 07:29 PM | #8 |
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Well, it's gone at the moment. If it returns, yes, I will post a clip.
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Analog 2011 e92 M3 | Jerez Black | Black Novillo | 6MT | CF roof | No iDrive, Nav, M button, ZCP, EDC, or center hump | ZHP shift knob | OMP 1010 pedals | K&N filter | Dinan engine tune | OEM exhaust mod (bypass) | EAS exhaust tips | shaved front bumper | 19" Apex EC-7 | 12 mm rear spacers
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05-18-2018, 08:41 PM | #9 |
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Did you change your exhaust?
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05-18-2018, 08:55 PM | #10 |
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About 10 months ago. OEM mod only. This pinging started maybe six weeks ago. I also have a K&N filter. That was a year ago. With the Dinan stage 1 tune, that's all the mods.
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05-18-2018, 09:52 PM | #11 |
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Sounds dumb and simple but have you checked the muffler? From the inside you can't tell where the sound is coming fro I've found. Front back left right.
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05-19-2018, 04:02 PM | #12 |
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Banging around with my fist, I can't make the mufflers rattle. The bumper buzzes, but not the same sound. It'd be brilliant if it's just a resonant noise. I'll keep that possibility in mind.
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05-25-2018, 10:14 PM | #15 |
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About 5K, so I doubt that's the issue.
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05-25-2018, 10:19 PM | #16 |
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Right -- WOT at 2500-3500 rpm, in my case from cruising speed. I will say frequency and severity have diminished in the past two weeks. Seems like either I really did get some bad gas or the Dinan software has learned to adjust the knock sensor. I'm still monitoring closely.
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05-26-2018, 11:39 AM | #17 |
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I hear this in mine too, same rpm range as well. No effect on performance from what I can tell.
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05-29-2018, 06:48 AM | #19 | |
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05-29-2018, 09:18 AM | #20 |
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I have an OEM straight thru Mod Exh. I bought it like that so don't know if it did it before. Also not really an aftermarket. I have sort of convinced myself it's exhaust shields rattling. I had a bmw master tech friend listen and he didn't think it was of anything of concern but.....I'm not 100% convinced.
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05-29-2018, 02:48 PM | #21 |
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Factory spec
Nope. My car is a bog standard M3 Pure exactly as it left the factory and maintained by the authorised BMW dealer according to the book for the last 5 years. All I do is fill it with gas and drive it.
Last edited by MINIDCT; 06-18-2018 at 01:50 AM.. |
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05-29-2018, 03:06 PM | #22 | |
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Lately, though, the pinging has stopped completely, who knows why. My totally uninformed theory is the engine management software is "learning" to adjust to different gas with different characteristics, including octane levels.
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