It finally happened and super knock??

asiflicious · 08-04-2018, 03:30 AM

So my CP finally blew tonight on my way to get my LSD put in. However that's the least of my concerns. When running the codes I also noticed a 30ED shadow code; super knock cylinder 1. How serious is this and what should I do? Prior to the CP blowing car was running flawlessly. I'm not sure how old that code is since I haven't had to check for codes in months. What could be causing that shadow code?

Gangplank · 08-04-2018, 07:14 AM

Quote:

Originally Posted by asiflicious

So my CP finally blew tonight on my way to get my LSD put in. However that's the least of my concerns. When running the codes I also noticed a 30ED shadow code; super knock cylinder 1. How serious is this and what should I do? Prior to the CP blowing car was running flawlessly. I'm not sure how old that code is since I haven't had to check for codes in months. What could be causing that shadow code?

Reading around the interwebs it sounds like superknock is caused by timing/overboost on a tune, bad plugs, or a combo.

What tune? How old are your plugs? What version injectors?

N54 or n55?

02Pilot · 08-04-2018, 07:14 AM

Is the fault present or stored? If you erase it does it come back? If not, I'd assume it was a transient fault when the charge pipe blew. If it returns, then it's time to start investigating.

1and1 · 08-04-2018, 08:44 AM

My first thought was a transient spike as well. Really weird things happen to air flow when the CP blows, the very definition of a transient event...

Clear and monitor, don't expect it'll return

asiflicious · 08-04-2018, 01:59 PM

Quote:

Originally Posted by Gangplank

Quote:

Originally Posted by asiflicious

So my CP finally blew tonight on my way to get my LSD put in. However that's the least of my concerns. When running the codes I also noticed a 30ED shadow code; super knock cylinder 1. How serious is this and what should I do? Prior to the CP blowing car was running flawlessly. I'm not sure how old that code is since I haven't had to check for codes in months. What could be causing that shadow code?

Reading around the interwebs it sounds like superknock is caused by timing/overboost on a tune, bad plugs, or a combo.

What tune? How old are your plugs? What version injectors?

N54 or n55?

N54, MHD OTS S2+ tune, plugs are about 15k miles old. Idk which injectors I have

Gangplank · 08-04-2018, 03:46 PM

Quote:

Originally Posted by asiflicious

Quote:

Originally Posted by Gangplank

Quote:

Originally Posted by asiflicious

So my CP finally blew tonight on my way to get my LSD put in. However that's the least of my concerns. When running the codes I also noticed a 30ED shadow code; super knock cylinder 1. How serious is this and what should I do? Prior to the CP blowing car was running flawlessly. I'm not sure how old that code is since I haven't had to check for codes in months. What could be causing that shadow code?

Reading around the interwebs it sounds like superknock is caused by timing/overboost on a tune, bad plugs, or a combo.

What tune? How old are your plugs? What version injectors?

N54 or n55?

N54, MHD OTS S2+ tune, plugs are about 15k miles old. Idk which injectors I have

Gotcha. I think 02Pilot & 1ana1 are probably right.

08-04-2018, 03:30 AM	#1
asiflicious Captain 670 Rep 963 Posts Drives: 2018 M2 Join Date: Aug 2017 Location: Winchester, CA iTrader: (0) Garage List 2018 BMW M2 [10.00]	It finally happened and super knock?? So my CP finally blew tonight on my way to get my LSD put in. However that's the least of my concerns. When running the codes I also noticed a 30ED shadow code; super knock cylinder 1. How serious is this and what should I do? Prior to the CP blowing car was running flawlessly. I'm not sure how old that code is since I haven't had to check for codes in months. What could be causing that shadow code?
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08-04-2018, 07:14 AM	#3
02Pilot Malcontent 188 Rep 305 Posts Drives: 128i Join Date: Jul 2017 Location: NY iTrader: (0)	Is the fault present or stored? If you erase it does it come back? If not, I'd assume it was a transient fault when the charge pipe blew. If it returns, then it's time to start investigating. __________________ Life's tough. It's tougher when you're stupid. -John Wayne
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08-04-2018, 08:44 AM	#4
1and1 Loves me some MHD! 1855 Rep 1,718 Posts Drives: faster than he should... Join Date: Jul 2016 Location: Tally, FL iTrader: (2) Garage List '09 135i [10.00]	My first thought was a transient spike as well. Really weird things happen to air flow when the CP blows, the very definition of a transient event... Clear and monitor, don't expect it'll return __________________ 1and1 135i - E82.N54 2009 BSM - MHD / xHP / DCI, PR CP & 7.5" Race IC / N55 mid & Borla . . WL RSFI, Koni, Eibach & Dinan CP's, M3 CA's / EBC Red's & Firehawk 500's X1 - E84.N20 2013 MGM - JB4 - The Wife's, now with new turbo & ewg
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