N55 PWG Hesitation/ Stutter under acceleration - BM3 stage 1 93

okla_m2c · 09-21-2021, 09:37 PM

I've heard many people mention this about coils.. I don't see how they can be messed up by having them removed and just plugged back in. Are they that finicky/sensitive?

harkes · 09-21-2021, 10:18 PM

Quote:

Originally Posted by thejeremyman9

BM3 is known to suppress codes, especially those related to misfires.

Quite the statement - where have you heard this? You mean actually "deleting" codes - like JB4 did on the de-cat CEL or running with a de-sensitised knock control?

thejeremyman9 · 09-22-2021, 12:13 AM

Quote:

Originally Posted by dookayy

I've heard many people mention this about coils.. I don't see how they can be messed up by having them removed and just plugged back in. Are they that finicky/sensitive?

Old ones are, yes... some people even have them break apart while pulling them out, like part gets stuck on the plug. Depends on your miles and the live your car lived (harsh winters, etc).

thejeremyman9 · 09-22-2021, 12:39 AM

Quote:

Originally Posted by harkes

Quite the statement - where have you heard this? You mean actually "deleting" codes - like JB4 did on the de-cat CEL or running with a de-sensitised knock control?

It was in the BM3 thread a while back first, several people reported it - issues like misfires with no codes while tuned, flashed back to stock and codes immediately came up. I would have to go back through tons of pages in that thread to find it.

However, these are the three most recent examples i could easily find:

https://f30.bimmerpost.com/forums/sh...uppress&page=5

https://f30.bimmerpost.com/forums/sh...light=suppress

https://f30.bimmerpost.com/forums/sh....php?t=1830137

Unfortunately these all come up in individuals threads, flashing back to stock reveales the issue, and the problem is solved so the thread dies off and never gets seen again.

So, it's not deleting codes - either preventing them entirely or at least decreasing the sensitvity to them coming up.

okla_m2c · 09-24-2021, 08:29 AM

I'll plan on flashing back to stock to see if any codes come up. Will report back.

I'd rather have a code pop up and tell me exactly which cylinder I'm having issues with, that way I can pin-point the problem and not waste time changing out everything.

okla_m2c · 09-24-2021, 01:33 PM

Alright, here's an update, and not a good one:

Flashed back to the stock tune w/ the NGK plugs still in the car. Drove around for a bit and did some pulls. No stutters, no misfires, no codes.

Decided to try and flash back to the BM3 Stage 2 93 Octane tune that I was running previously. Did that, and went out, did some pulls, and the stutters/jerkiness came back while accelerating hard. Still no codes.

I think tomorrow I will go back to the old Bosch plugs and see if there are any issues.

okla_m2c · 09-25-2021, 03:05 PM

This has been more than frustrating at the very least. I tried the following troubleshooting steps but no luck:

1. I double-checked all of the NGK plugs and ensured I gapped them correctly and retorqued them to spec (17 ftlbs or 23 NM). Still had issues.
2. Switched out the plugs with the OEM Bosch plugs, and the issues seemed almost worse.

I'm now wondering if I have a boost leak, and/or if the initial jerk of the engine when I first installed the plugs knocked something loose, or something entirely different.

Issa.M · 09-25-2021, 03:10 PM

Quote:

Originally Posted by dookayy

This has been more than frustrating at the very least. I tried the following troubleshooting steps but no luck:

1. I double-checked all of the NGK plugs and ensured I gapped them correctly and retorqued them to spec (17 ftlbs or 23 NM).
2. Switched out the plugs with the OEM Bosch plugs, and the issues seem almost worse.

I'm now wondering if I have a boost leak, and/or if the initial jerk of the engine when I first installed the plugs knocked something loose, or something entirely different.

Bootmod3 gave me a new tune which helped but with the normal tune it's still there, maybe it's the drive shaft? Still stumped but rocking the new tune. Keep me posted

MadToy · 09-26-2021, 09:11 AM

When in doubt, run the M2 tune. Less aggressive in the lower rpm range, and should be smoother.

thejeremyman9 · 09-26-2021, 11:52 PM

Quote:

Originally Posted by dookayy

This has been more than frustrating at the very least. I tried the following troubleshooting steps but no luck:

1. I double-checked all of the NGK plugs and ensured I gapped them correctly and retorqued them to spec (17 ftlbs or 23 NM). Still had issues.
2. Switched out the plugs with the OEM Bosch plugs, and the issues seemed almost worse.

I'm now wondering if I have a boost leak, and/or if the initial jerk of the engine when I first installed the plugs knocked something loose, or something entirely different.

No codes still even on stock tune? What's your most recent log?

Issa.M · 10-28-2021, 11:58 PM

Quote:

Originally Posted by thejeremyman9

Quote:

Originally Posted by dookayy

This has been more than frustrating at the very least. I tried the following troubleshooting steps but no luck:

1. I double-checked all of the NGK plugs and ensured I gapped them correctly and retorqued them to spec (17 ftlbs or 23 NM). Still had issues.
2. Switched out the plugs with the OEM Bosch plugs, and the issues seemed almost worse.

I'm now wondering if I have a boost leak, and/or if the initial jerk of the engine when I first installed the plugs knocked something loose, or something entirely different.

No codes still even on stock tune? What's your most recent log?

Update: replaced very dirty air filter with a K&N one and stuttering is practically gone, it's there once in a while but you have to feel for it. Hope this helps anyone out there with the same issue

thejeremyman9 · 10-29-2021, 12:24 AM

Quote:

Originally Posted by Issa.M

Update: replaced very dirty air filter with a K&N one and stuttering is practically gone, it's there once in a while but you have to feel for it. Hope this helps anyone out there with the same issue

Might need to reset MAF adaptations or something due to air filter.

okla_m2c · 11-02-2021, 08:59 AM

Changed the coils and flashed to Stage 1 instead of the Stage 2 tune.. stuttering seems to be gone now.

I was having issues with trying to datalog with BM3. For whatever reason, the logs just wouldn't save (I tried the online and offline modes).

All of this may be a mute point.. I've been eyeing an M2C and looking to upgrade..

UhhItsANT · 01-09-2022, 05:36 PM

Quote:

Originally Posted by thejeremyman9

Remove the bm3 trans flash, that in itself is known to cause some strange behavior and issues. If you want a trans flash get XHP, but wait until your issues are solved.

I can run XHP tran tune along side bm3? What stage XHP do you run? Do you use BM3 or MHD?

thejeremyman9 · 01-10-2022, 11:23 AM

Quote:

Originally Posted by UhhItsANT

I can run XHP tran tune along side bm3? What stage XHP do you run? Do you use BM3 or MHD?

Yes XHP is a transmission tune and is completely separate from DME tunes from MHD or BM3. BM3 does offer a (basic) transmission tune in addition to their DME tune, so XHP would replace that. Recent logs also showed that the BM3 trans tune was not setting torque limits high enough to get full power from stage 2+.

I run MHD and XHP stage 3

Issa.M · 02-24-2022, 06:44 PM

Quote:

Originally Posted by thejeremyman9

Yes XHP is a transmission tune and is completely separate from DME tunes from MHD or BM3. BM3 does offer a (basic) transmission tune in addition to their DME tune, so XHP would replace that. Recent logs also showed that the BM3 trans tune was not setting torque limits high enough to get full power from stage 2+.

I run MHD and XHP stage 3

Still getting a little stutter so will clean the MAF sensor to see if that helps. How is XHP trans tune, thinking of getting it. Also, why choose MHD over BM3.

The mechanic said my diff is howling, so it could be the culprit to the grinding sound I was hearing in RWD. Maybe the diff is trying to lock up which causes the stutter??? idk

thejeremyman9 · 02-25-2022, 01:03 PM

Quote:

Originally Posted by Issa.M

Still getting a little stutter so will clean the MAF sensor to see if that helps. How is XHP trans tune, thinking of getting it. Also, why choose MHD over BM3.

The mechanic said my diff is howling, so it could be the culprit to the grinding sound I was hearing in RWD. Maybe the diff is trying to lock up which causes the stutter??? idk

XHP is great, definitely recommend it. I wont get into the whole MHD vs BM3 thing... plenty of threads on that. MHD fit what i wanted for a variety of reasons including from the app-based platform to having load-based tunes.

No idea about your grinding sound, and don't know what you mean about "trying to lock up"

n55david · 02-26-2022, 07:02 AM

Quote:

Originally Posted by thejeremyman9

Quote:

Originally Posted by Issa.M

Still getting a little stutter so will clean the MAF sensor to see if that helps. How is XHP trans tune, thinking of getting it. Also, why choose MHD over BM3.

The mechanic said my diff is howling, so it could be the culprit to the grinding sound I was hearing in RWD. Maybe the diff is trying to lock up which causes the stutter??? idk

XHP is great, definitely recommend it. I wont get into the whole MHD vs BM3 thing... plenty of threads on that. MHD fit what i wanted for a variety of reasons including from the app-based platform to having load-based tunes.

No idea about your grinding sound, and don't know what you mean about "trying to lock up"

Yeah the bm3 mhd debate is hilarious.. have you ever seen the posts in the Facebook groups?

thejeremyman9 · 02-27-2022, 05:47 PM

Quote:

Originally Posted by Phantom10R

Yeah the bm3 mhd debate is hilarious.. have you ever seen the posts in the Facebook groups?

I don't even use facebook and i certainly would not do so for any kind of technical discussion lol...

n55david · 02-27-2022, 06:42 PM

Quote:

Originally Posted by thejeremyman9

Quote:

Originally Posted by Phantom10R

Yeah the bm3 mhd debate is hilarious.. have you ever seen the posts in the Facebook groups?

I don't even use facebook and i certainly would not do so for any kind of technical discussion lol...

You're almost missing out but don't blame you!

09-21-2021, 09:37 PM	#23
okla_m2c Private First Class 97 Rep 139 Posts Drives: '20 BMW F87 M2C Join Date: Aug 2014 Location: Washington, DC iTrader: (0) Garage List 2020 BMW M2 Competi ... [0.00]	I've heard many people mention this about coils.. I don't see how they can be messed up by having them removed and just plugged back in. Are they that finicky/sensitive?
	Appreciate 0 Quote

09-24-2021, 08:29 AM	#27
okla_m2c Private First Class 97 Rep 139 Posts Drives: '20 BMW F87 M2C Join Date: Aug 2014 Location: Washington, DC iTrader: (0) Garage List 2020 BMW M2 Competi ... [0.00]	I'll plan on flashing back to stock to see if any codes come up. Will report back. I'd rather have a code pop up and tell me exactly which cylinder I'm having issues with, that way I can pin-point the problem and not waste time changing out everything.
	Appreciate 0 Quote

09-24-2021, 01:33 PM	#28
okla_m2c Private First Class 97 Rep 139 Posts Drives: '20 BMW F87 M2C Join Date: Aug 2014 Location: Washington, DC iTrader: (0) Garage List 2020 BMW M2 Competi ... [0.00]	Alright, here's an update, and not a good one: Flashed back to the stock tune w/ the NGK plugs still in the car. Drove around for a bit and did some pulls. No stutters, no misfires, no codes. Decided to try and flash back to the BM3 Stage 2 93 Octane tune that I was running previously. Did that, and went out, did some pulls, and the stutters/jerkiness came back while accelerating hard. Still no codes. I think tomorrow I will go back to the old Bosch plugs and see if there are any issues.
	Appreciate 0 Quote

09-25-2021, 03:05 PM	#29
okla_m2c Private First Class 97 Rep 139 Posts Drives: '20 BMW F87 M2C Join Date: Aug 2014 Location: Washington, DC iTrader: (0) Garage List 2020 BMW M2 Competi ... [0.00]	This has been more than frustrating at the very least. I tried the following troubleshooting steps but no luck: 1. I double-checked all of the NGK plugs and ensured I gapped them correctly and retorqued them to spec (17 ftlbs or 23 NM). Still had issues. 2. Switched out the plugs with the OEM Bosch plugs, and the issues seemed almost worse. I'm now wondering if I have a boost leak, and/or if the initial jerk of the engine when I first installed the plugs knocked something loose, or something entirely different. Last edited by okla_m2c; 09-25-2021 at 03:14 PM..
	Appreciate 0 Quote

09-26-2021, 09:11 AM	#31
MadToy Second Lieutenant 64 Rep 263 Posts Drives: '18 340i Xdrive Join Date: Jul 2014 Location: Mooresville, NC iTrader: (1)	When in doubt, run the M2 tune. Less aggressive in the lower rpm range, and should be smoother.
	Appreciate 0 Quote

11-02-2021, 08:59 AM	#35
okla_m2c Private First Class 97 Rep 139 Posts Drives: '20 BMW F87 M2C Join Date: Aug 2014 Location: Washington, DC iTrader: (0) Garage List 2020 BMW M2 Competi ... [0.00]	Changed the coils and flashed to Stage 1 instead of the Stage 2 tune.. stuttering seems to be gone now. I was having issues with trying to datalog with BM3. For whatever reason, the logs just wouldn't save (I tried the online and offline modes). All of this may be a mute point.. I've been eyeing an M2C and looking to upgrade..
	Appreciate 0 Quote