Stutter/misfire feel at WOT

Jayrhee7 · 01-04-2024, 02:52 PM

So I’m currently on the BM3 multimap stage2+ OTS tune, with about e30.

It seems whenever I go WOT, high rpm range, the car stutters or misfires. No codes at all. Just feels as if the car is breaking up or choking rapidly.

I took a log of it but let off as soon as I felt the stutters. Can anyone who’s more knowledagble with reading logs, take a look and see if there’s anything that can lead to why the cars doing this?

It was running perfectly fine for about a week or two when I first installed the flex fuel kit but now it’s back to doing it. Fresh plugs (0.030) and PR coils.

https://bootmod3.net/log?id=65970e30f9a8ea58b1642010

VGSON · 01-04-2024, 06:05 PM

whats your fuel setup?

Jayrhee7 · 01-04-2024, 06:26 PM

Quote:

Originally Posted by VGSON

whats your fuel setup?

• Precision Raceworks stage 2.5 LPFP
• Dorch stage 1 HPFP
• Originally had ET3 design EKPM but it failed on me so I put the original back on.
• BM3 FlexFuel kit

ericlr1225 · 01-05-2024, 05:49 AM

gap down

AmuroRay · 01-05-2024, 08:26 AM

Could be maxing out MAP, or it could be plugs or an injector.

Jayrhee7 · 01-05-2024, 12:07 PM

Quote:

Originally Posted by ericlr1225

gap down

Quote:

Originally Posted by AmuroRay

Could be maxing out MAP, or it could be plugs or an injector.

I’m thinking plugs as well. Do y’all have a recommended gap I should go down to? I had 0.028 before these new plugs, but car still did same behavior on stage 2+ OTS map. I read somewhere 0.030 was the stock gap so I gapped wider on the fresh plugs.
MAP was replaced for a 3.5 BAR before getting the flexfuel kit, and injectors were replaced with EU6’s not too long ago. Hoping it’s just plug gap!

Mr_M// · 01-11-2024, 11:40 AM

At what RPM does it do it?
Does it constantly at the same RPM?

Jayrhee7 · 01-12-2024, 01:43 AM

Quote:

Originally Posted by Mr_M//

At what RPM does it do it?
Does it constantly at the same RPM?

I believe it’s around 5k rpm. And yes, consistently at the higher rpm range it does this.

Mr_M// · 01-12-2024, 01:59 AM

I had the exact same issue with stage 2+, it was my HPFP, but I had stock HPFP.
Does it do it with stage 2 not 2+.
What is your Emix ? (E30?)

CanadianM2 · 01-12-2024, 02:03 AM

Quote:

Originally Posted by Mr_M//

I had the exact same issue with stage 2+, it was my HPFP, but I had stock HPFP.
Does it do it with stage 2 not 2+.
What is your Emix ? (E30?)

In his log it looks like the hpfp is keeping up fine

Mr_M// · 01-12-2024, 09:43 AM

Quote:

Originally Posted by CanadianM2

In his log it looks like the hpfp is keeping up fine

I’m just sharing with him My issue was fuel related, so it can atleast gives him an idea what it could be.

Jayrhee7 · 01-12-2024, 10:07 AM

[QUOTE="Mr_M//;30806658"]I had the exact same issue with stage 2+, it was my HPFP, but I had stock HPFP.
Does it do it with stage 2 not 2+.
What is your Emix ? (E30?)

Stage 2, no issues.
Stage 2+ & MM Stage 2+, I get the stutter/misfire feeling issue.
According to the FlexFuel sensor, I’m at about e25 currently!

Mr_M// · 01-12-2024, 10:27 AM

[QUOTE=Jayrhee7;30807444]

Quote:

Originally Posted by Mr_M//

I had the exact same issue with stage 2+, it was my HPFP, but I had stock HPFP.
Does it do it with stage 2 not 2+.
What is your Emix ? (E30?)

Stage 2, no issues.
Stage 2+ & MM Stage 2+, I get the stutter/misfire feeling issue.
According to the FlexFuel sensor, I’m at about e25 currently!

Did get this issue after you installed the flex fuel sensor ?
Did you run the car with stage2+ or MM stage 2+ without issue before the flex fuel sensor? Or did you do everything at the same time?

ericlr1225 · 01-12-2024, 10:38 AM

[QUOTE=Jayrhee7;30807444]

Quote:

Originally Posted by Mr_M//

I had the exact same issue with stage 2+, it was my HPFP, but I had stock HPFP.
Does it do it with stage 2 not 2+.
What is your Emix ? (E30?)

Stage 2, no issues.
Stage 2+ & MM Stage 2+, I get the stutter/misfire feeling issue.
According to the FlexFuel sensor, I’m at about e25 currently!

First, the stage2+ require E40+ to run smoothly/clean timing
Second, your hpfp holds up fine
Third, your injectors are new(hardest to diagnose)
Last, according to what you said, it's boost related. Just gap down

Jayrhee7 · 01-12-2024, 10:42 AM

Quote:

Originally Posted by Mr_M//

Did get this issue after you installed the flex fuel sensor ?
Did you run the car with stage2+ or MM stage 2+ without issue before the flex fuel sensor? Or did you do everything at the same time?

First time I ran stage 2+ 93oct OTS map, I didn’t have FlexFuel or ran any E. I still had the same symptoms on that map, but when I installed the FlexFuel and added E, I still had symptoms on the MM Stage 2+ map.

Jayrhee7 · 01-12-2024, 10:43 AM

Quote:

Originally Posted by ericlr1225

First, the stage2+ require E40+ to run smoothly/clean timing
Second, your hpfp holds up fine
Third, your injectors are new(hardest to diagnose)
Last, according to what you said, it's boost related. Just gap down

Oh, I did not know it needed e40+! Will add some more after I gap down and see how things run 👍🏼

Mr_M// · 01-12-2024, 10:49 AM

Quote:

Originally Posted by Jayrhee7

First time I ran stage 2+ 93oct OTS map, I didn’t have FlexFuel or ran any E. I still had the same symptoms on that map, but when I installed the FlexFuel and added E, I still had symptoms on the MM Stage 2+ map.

What HPFP did you select on the stage 2+?
Maybe try selecting a different one.

Jayrhee7 · 01-12-2024, 02:12 PM

Quote:

Originally Posted by Mr_M//

What HPFP did you select on the stage 2+?
Maybe try selecting a different one.

I have Dorch Stage 1 selected in the configurations.

-Eidos · 01-12-2024, 05:24 PM

Quote:

Originally Posted by Jayrhee7

So I’m currently on the BM3 multimap stage2+ OTS tune, with about e30.

It seems whenever I go WOT, high rpm range, the car stutters or misfires. No codes at all. Just feels as if the car is breaking up or choking rapidly.

I took a log of it but let off as soon as I felt the stutters. Can anyone who’s more knowledagble with reading logs, take a look and see if there’s anything that can lead to why the cars doing this?

It was running perfectly fine for about a week or two when I first installed the flex fuel kit but now it’s back to doing it. Fresh plugs (0.030) and PR coils.

https://bootmod3.net/log?id=65970e30f9a8ea58b1642010

I've seen PR Coils cause issues for some owners. If gapping down doesn't help, I suggest going back to stock coils. Stock coils should be plenty for your current setup.

Jayrhee7 · 01-12-2024, 05:49 PM

Quote:

Originally Posted by -Eidos

I've seen PR Coils cause issues for some owners. If gapping down doesn't help, I suggest going back to stock coils. Stock coils should be plenty for your current setup.

I had a couple new PR coils lying around, so I swapped out certain cylinders, which remedied the issue at first, but the stutters came back within the day.
I have a set of OEM coils as well. When the Bosch plugs arrive, should I give 0.025 gap a try?

ericlr1225 · 01-13-2024, 12:48 AM

Quote:

Originally Posted by Jayrhee7

I had a couple new PR coils lying around, so I swapped out certain cylinders, which remedied the issue at first, but the stutters came back within the day.
I have a set of OEM coils as well. When the Bosch plugs arrive, should I give 0.025 gap a try?

Try not to make more variable changes. Just...gap down first.
Get them to 0.022-0.023 first then do some log/pulls. If it fix your issue, you can gap up later.
If the issue still remain, there is no point to gap down more under 0.022''. At least you know it's something else.

Mr_M// · 01-15-2024, 11:33 AM

I would check the injectors and work that was done after they got replaced.
But hopefully you don’t need to do that after gaping the plugs or changing the coils.
Good luck

01-04-2024, 02:52 PM	#1
Jayrhee7 Second Lieutenant 44 Rep 284 Posts Drives: BMW M2 Join Date: May 2020 Location: Florida iTrader: (0)	So I’m currently on the BM3 multimap stage2+ OTS tune, with about e30. It seems whenever I go WOT, high rpm range, the car stutters or misfires. No codes at all. Just feels as if the car is breaking up or choking rapidly. I took a log of it but let off as soon as I felt the stutters. Can anyone who’s more knowledagble with reading logs, take a look and see if there’s anything that can lead to why the cars doing this? It was running perfectly fine for about a week or two when I first installed the flex fuel kit but now it’s back to doing it. Fresh plugs (0.030) and PR coils. https://bootmod3.net/log?id=65970e30f9a8ea58b1642010
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01-04-2024, 06:05 PM	#2
VGSON First Lieutenant 220 Rep 312 Posts Drives: F87 OGM2 Join Date: Feb 2023 Location: NC iTrader: (0)	whats your fuel setup?
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01-05-2024, 05:49 AM	#4
ericlr1225 Second Lieutenant 137 Rep 249 Posts Drives: 2018 M2 LCI 6MT Join Date: Sep 2022 Location: Los Angeles iTrader: (0)	gap down
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01-05-2024, 08:26 AM	#5
AmuroRay Brigadier General 2302 Rep 4,162 Posts Drives: M235i Join Date: Aug 2019 Location: Florida iTrader: (0)	Could be maxing out MAP, or it could be plugs or an injector. __________________ Mods: Yes.
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01-11-2024, 11:40 AM	#7
Mr_M// Second Lieutenant 124 Rep 261 Posts Drives: 2017 M2/M3 Join Date: Jan 2020 Location: Ontario iTrader: (0)	At what RPM does it do it? Does it constantly at the same RPM? __________________ Speedtech top mount G35\|Motive\| Reflex plus \| Wagner EVO 3 \| BMP manifold \| Dorch Stage 2 HPFP \| PI \| Precision Racework stage 4V2 LPFP \| BendCalibration Flex Fuel Kit \|turner catch can\| HRE 20” \Apex 18” wheels\| ECUTEK tuned by bendCalibration\|ohlins suspension IG Modded_M2
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01-12-2024, 01:59 AM	#9
Mr_M// Second Lieutenant 124 Rep 261 Posts Drives: 2017 M2/M3 Join Date: Jan 2020 Location: Ontario iTrader: (0)	I had the exact same issue with stage 2+, it was my HPFP, but I had stock HPFP. Does it do it with stage 2 not 2+. What is your Emix ? (E30?) __________________ Speedtech top mount G35\|Motive\| Reflex plus \| Wagner EVO 3 \| BMP manifold \| Dorch Stage 2 HPFP \| PI \| Precision Racework stage 4V2 LPFP \| BendCalibration Flex Fuel Kit \|turner catch can\| HRE 20” \Apex 18” wheels\| ECUTEK tuned by bendCalibration\|ohlins suspension IG Modded_M2
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01-12-2024, 10:07 AM	#12
Jayrhee7 Second Lieutenant 44 Rep 284 Posts Drives: BMW M2 Join Date: May 2020 Location: Florida iTrader: (0)	[QUOTE="Mr_M//;30806658"]I had the exact same issue with stage 2+, it was my HPFP, but I had stock HPFP. Does it do it with stage 2 not 2+. What is your Emix ? (E30?) Stage 2, no issues. Stage 2+ & MM Stage 2+, I get the stutter/misfire feeling issue. According to the FlexFuel sensor, I’m at about e25 currently!
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01-15-2024, 11:33 AM	#22
Mr_M// Second Lieutenant 124 Rep 261 Posts Drives: 2017 M2/M3 Join Date: Jan 2020 Location: Ontario iTrader: (0)	I would check the injectors and work that was done after they got replaced. But hopefully you don’t need to do that after gaping the plugs or changing the coils. Good luck __________________ Speedtech top mount G35\|Motive\| Reflex plus \| Wagner EVO 3 \| BMP manifold \| Dorch Stage 2 HPFP \| PI \| Precision Racework stage 4V2 LPFP \| BendCalibration Flex Fuel Kit \|turner catch can\| HRE 20” \Apex 18” wheels\| ECUTEK tuned by bendCalibration\|ohlins suspension IG Modded_M2
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