Bootmod3 Cold Start Issue

gman444 · 04-18-2019, 09:51 PM

Hi guys,

So I pulled the plug and flashed my car with the bootmod3 stage 0+ GTS tune. Paired with the m performance exhaust, the tune transformed the way the car sounds.

But leaving work the next day, I noticed an issue on cold start. The car would rev up then down (almost as if it was about to stall). I immediately turned it back off and on and it was fine. I flashed it to the CS tune and noticed the same thing happen today while leaving work (+4 degrees).

Not sure if this is relevant, but this does not happen during all cold starts. Its completely fine in the mornings. I have only had it happen these two times so far (both after work, car is sitting for 8 hours). Can anyone chime in?

I don't have the cold start delete.

Thank you

chewbakam4 · 04-18-2019, 10:39 PM

If you changed your cold start RPM setup on the map that’s why. I’d set that to OEM and set cat heating to off and you’re set

gman444 · 04-18-2019, 10:55 PM

This is my current setup

avex8 · 04-18-2019, 11:04 PM

I had same issue and I cleaned my MAF sensor the rough idle went away

behindthen0thing · 04-19-2019, 04:58 AM

Mine idles rough when cold. Cold start disabled. Do you think the maf sensor clean would fix that?

gman444 · 04-19-2019, 07:15 AM

Car only has 8000kms and stock intakes. It only started doing this after the tune. Do you think it could still be the MAF? Is there some sort of "learning period" for the car that I should expect after the tune?

M3Jae · 04-19-2019, 11:28 AM

Contact Bootmod3 Support!

https://bootmod3.atlassian.net/servi...stomer/portals

cAtLeYx · 04-19-2019, 12:35 PM

I had the same - Have you used BM3 to read for error codes. Mine showed misfire on cylinder 5.

gman444 · 04-19-2019, 07:45 PM

I have contacted bootmod help centre. Also, these are the codes I got when I did the diagnostics. Nothing relevant to this issue, I believe.

nioh_lbbm2 · 04-19-2019, 10:54 PM

Keep in mind a fresh flash the ECU needs to re learn adaptations for idle, etc in varying temps

gman444 · 04-23-2019, 03:42 PM

Update: Bootmod3 customer service replied to me and suggested to try reset adaptations under diagnostics. This seems to have worked and the car hasn't done this since.

mike@x-ph.com · 04-24-2019, 03:57 PM

Quote:

Originally Posted by gman444

Update: Bootmod3 customer service replied to me and suggested to try reset adaptations under diagnostics. This seems to have worked and the car hasn't done this since.

04-18-2019, 09:51 PM	#1
gman444 Enlisted Member 26 Rep 39 Posts Drives: BMW M3 Join Date: Mar 2018 Location: Edmonton, Canada iTrader: (0)	Bootmod3 Cold Start Issue Hi guys, So I pulled the plug and flashed my car with the bootmod3 stage 0+ GTS tune. Paired with the m performance exhaust, the tune transformed the way the car sounds. But leaving work the next day, I noticed an issue on cold start. The car would rev up then down (almost as if it was about to stall). I immediately turned it back off and on and it was fine. I flashed it to the CS tune and noticed the same thing happen today while leaving work (+4 degrees). Not sure if this is relevant, but this does not happen during all cold starts. Its completely fine in the mornings. I have only had it happen these two times so far (both after work, car is sitting for 8 hours). Can anyone chime in? I don't have the cold start delete. Thank you
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04-18-2019, 10:39 PM	#2
chewbakam4 Major 717 Rep 1,184 Posts Drives: F82 M4 Join Date: Oct 2015 Location: Malton iTrader: (0)	If you changed your cold start RPM setup on the map that’s why. I’d set that to OEM and set cat heating to off and you’re set
	Appreciate 0 Quote

04-18-2019, 10:55 PM	#3
gman444 Enlisted Member 26 Rep 39 Posts Drives: BMW M3 Join Date: Mar 2018 Location: Edmonton, Canada iTrader: (0)	This is my current setup Attached Images
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04-18-2019, 11:04 PM	#4
avex8 Major 324 Rep 1,337 Posts Drives: 11 E92 m3, 15 F80 M3, GLC 63 Join Date: May 2011 Location: San Diego iTrader: (3)	I had same issue and I cleaned my MAF sensor the rough idle went away
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04-19-2019, 04:58 AM	#5
behindthen0thing Captain 840 Rep 937 Posts Drives: M4 Join Date: Jul 2018 Location: Germany iTrader: (0)	Mine idles rough when cold. Cold start disabled. Do you think the maf sensor clean would fix that?
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04-19-2019, 07:15 AM	#6
gman444 Enlisted Member 26 Rep 39 Posts Drives: BMW M3 Join Date: Mar 2018 Location: Edmonton, Canada iTrader: (0)	Car only has 8000kms and stock intakes. It only started doing this after the tune. Do you think it could still be the MAF? Is there some sort of "learning period" for the car that I should expect after the tune?
	Appreciate 0 Quote

04-19-2019, 11:28 AM	#7
M3Jae New Member 7 Rep 24 Posts Drives: F80 M3 Silverstone II Join Date: May 2016 Location: Atlanta, Georgia iTrader: (0)	Contact Bootmod3 Support! https://bootmod3.atlassian.net/servi...stomer/portals
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04-19-2019, 12:35 PM	#8
cAtLeYx Private 23 Rep 50 Posts Drives: Mineral White M4 DCT Join Date: Jun 2018 Location: UK iTrader: (0)	I had the same - Have you used BM3 to read for error codes. Mine showed misfire on cylinder 5.
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04-19-2019, 07:45 PM	#9
gman444 Enlisted Member 26 Rep 39 Posts Drives: BMW M3 Join Date: Mar 2018 Location: Edmonton, Canada iTrader: (0)	I have contacted bootmod help centre. Also, these are the codes I got when I did the diagnostics. Nothing relevant to this issue, I believe. Attached Images
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04-19-2019, 10:54 PM	#10
nioh_lbbm2 Lieutenant Colonel 1717 Rep 1,899 Posts Drives: M2 Join Date: Mar 2018 Location: California iTrader: (0)	Keep in mind a fresh flash the ECU needs to re learn adaptations for idle, etc in varying temps
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04-23-2019, 03:42 PM	#11
gman444 Enlisted Member 26 Rep 39 Posts Drives: BMW M3 Join Date: Mar 2018 Location: Edmonton, Canada iTrader: (0)	Update: Bootmod3 customer service replied to me and suggested to try reset adaptations under diagnostics. This seems to have worked and the car hasn't done this since.
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