BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
M2 Technical Topics > Track / Autocross / Dragstrip > [2018 M2, N55] Misfires on 2 cyls on track

Post Reply
 
Thread Tools Search this Thread
      05-15-2023, 12:26 AM   #1
pal
Captain
pal's Avatar
433
Rep
753
Posts

Drives: Z4 M Coupe
Join Date: Nov 2007
Location: Seattle, WA

iTrader: (2)

[2018 M2, N55] Misfires on 2 cyls on track

On the last session of a 2 day track event, the car goes into limp mode while I am WOT in 4th gear over 6200rpm. Shut it off after a couple corners and started it back up and brought it into the paddock and scanned for codes. Misfires on cylinders 3 & 6, injection shut down on both (images of the codes scanned using Bimmerlink attached here).

It was a hot couple of days and the ambient was 90°F in the last session today at around 3:50pm. Car had about 3/4ths of a tank of gas.

I changed the plugs and coil packs about a year ago on May 1st, 2022. The car had 21,160 miles at the time. Today it had 34,634 miles when the car misfired, and it was the 21st track day since I changed the plugs and coils. Only engine mods are a Dinan Stage 1 harness (the original big harness), Akra 300 cell catted downpipe, ER intercooler, ER charge pipes, K&N panel filter.

I did drive the car 95 miles home, and even did some 3rd and 4th gear pulls at partial throttle to maybe 5000-5500rpm. No issues. Car runs fine and even got as expected mileage on the way home.

Thoughts? And thanks in advance.
Attached Images
    
Appreciate 0
      05-17-2023, 11:51 AM   #2
E90convert
Lieutenant
United_States
154
Rep
402
Posts

Drives: F87 M2 DCT, F15 X5
Join Date: Dec 2014
Location: Central Ohio

iTrader: (0)

Might just needs plugs again. Were you logging with BimmerLink at all during the session? Maybe the cylinder and head temps crept up high, and you have weak plugs. You’re running a tune now and doing track events, and that could be eating up the plugs a bit faster. Easy check to pull cylinder 3 plug and have a look
Appreciate 0
      05-17-2023, 12:40 PM   #3
dvas
Lieutenant
dvas's Avatar
515
Rep
579
Posts

Drives: 2017 M2 - Mineral Gray, 6spd
Join Date: Jul 2014
Location: NYC

iTrader: (0)

I would think it's the plugs as well. That's what the issue was on my car when I had misfires. Interesting that you replaced them not long ago, but may be a solid and cheap place to start to replace them and make sure the gaps are accurate.
__________________
Appreciate 0
      05-17-2023, 06:18 PM   #4
neonbrown
Second Lieutenant
neonbrown's Avatar
United_States
275
Rep
220
Posts

Drives: 2018 M2
Join Date: Oct 2020
Location: Dallas

iTrader: (2)

might want to replace injectors as well, fcp euro sells them.

i had injector failure on track that led to a damaged piston. currently rebuilding my motor with BMB autowerks for a full forged build.
Appreciate 0
      05-18-2023, 01:44 PM   #5
-Eidos
@lbb_kev
482
Rep
508
Posts

Drives: 2018 BMW M2 (LBB)
Join Date: Feb 2020
Location: California

iTrader: (0)

Quote:
Originally Posted by pal View Post
On the last session of a 2 day track event, the car goes into limp mode while I am WOT in 4th gear over 6200rpm. Shut it off after a couple corners and started it back up and brought it into the paddock and scanned for codes. Misfires on cylinders 3 & 6, injection shut down on both (images of the codes scanned using Bimmerlink attached here).

It was a hot couple of days and the ambient was 90°F in the last session today at around 3:50pm. Car had about 3/4ths of a tank of gas.

I changed the plugs and coil packs about a year ago on May 1st, 2022. The car had 21,160 miles at the time. Today it had 34,634 miles when the car misfired, and it was the 21st track day since I changed the plugs and coils. Only engine mods are a Dinan Stage 1 harness (the original big harness), Akra 300 cell catted downpipe, ER intercooler, ER charge pipes, K&N panel filter.

I did drive the car 95 miles home, and even did some 3rd and 4th gear pulls at partial throttle to maybe 5000-5500rpm. No issues. Car runs fine and even got as expected mileage on the way home.

Thoughts? And thanks in advance.
Someone I know dealt with misfire issues on track and replaced practically everything but his Dinan piggyback tune and still had misfires. After going back to stock tune, his misfires went away.

You could be due for plugs and coils especially after 21 track days, but don't hesitate to yank that piggy back tune out.
__________________
Speedtech Stage 3 (8474) | Remus Exhaust | Wagner EVO 3 | XClutch | Dorch Stage 3 HPFP | Nostrum S2 Injectors | Walbro 535 | EOS EKP | BendCalibration Flex Fuel Kit | Intrax 1K2 | SPL | Drexler GT Race Light LSD by limitedslip.de | Schirmer Diff Lift Kit

Full E85 DI-Only 717WHP Flex Fuel tuned by BendCalibration (ECUTek) | Built by SD Garage
Appreciate 0
      05-29-2023, 04:12 PM   #6
GasBurnlife(landapanda)
Captain
573
Rep
683
Posts

Drives: BMW M2
Join Date: Aug 2012
Location: Ashburn, Virginia

iTrader: (0)

We have seen this on couple of other M2s our group runs, both 17s with 25k-35k miles and 100+ track days and it turned out to be the HPFP. I am at 150 days and 38k miles, of which roughly 15k are on track. I preventative replace my HPFP, plugs, coils, water pump, valve cover and thermostat. I did all of this because I started to get wear in my bearings, as demonstrated by metal shavings in my oil, and the primary purpose of this service was to do the bearings. The rest got done since you have to take the valve cover off to get to the #1 cylinder bearings under the oil pump.

Looking forward to another 100+ days at which point I’ll pull the engine for a full service.
Appreciate 0
      05-29-2023, 05:05 PM   #7
E90convert
Lieutenant
United_States
154
Rep
402
Posts

Drives: F87 M2 DCT, F15 X5
Join Date: Dec 2014
Location: Central Ohio

iTrader: (0)

Quote:
Originally Posted by GasBurnlife(landapanda) View Post
We have seen this on couple of other M2s our group runs, both 17s with 25k-35k miles and 100+ track days and it turned out to be the HPFP. I am at 150 days and 38k miles, of which roughly 15k are on track. I preventative replace my HPFP, plugs, coils, water pump, valve cover and thermostat. I did all of this because I started to get wear in my bearings, as demonstrated by metal shavings in my oil, and the primary purpose of this service was to do the bearings. The rest got done since you have to take the valve cover off to get to the #1 cylinder bearings under the oil pump.

Looking forward to another 100+ days at which point I’ll pull the engine for a full service.
Interested to hear more about your experience on the useful life of an N55 on track. Several questions if it’s not too much trouble: Any mods to the car? What tires are you running? What engine oil was used? What engine oil and coolant temps were you seeing?
__________________
‘18 F87 M2 DCT
'17 F15 X5 xDrive35i M-Sport
Sold in 2023 '12 F30 335i 8AT Sport Line
Sold in 2020 '08 E92 335xi 6MT
Sold in 2016 '08 E90 335i 6MT - FBO
Appreciate 0
      05-30-2023, 12:38 PM   #8
GasBurnlife(landapanda)
Captain
573
Rep
683
Posts

Drives: BMW M2
Join Date: Aug 2012
Location: Ashburn, Virginia

iTrader: (0)

No power mods, and mainly running 200 TW tires with maybe 12-15 days on takeoffs. Have been changing Motul 5w-40 300V oil every 2-3 weekends.
Appreciate 0
      05-30-2023, 06:17 PM   #9
E90convert
Lieutenant
United_States
154
Rep
402
Posts

Drives: F87 M2 DCT, F15 X5
Join Date: Dec 2014
Location: Central Ohio

iTrader: (0)

Quote:
Originally Posted by GasBurnlife(landapanda) View Post
No power mods, and mainly running 200 TW tires with maybe 12-15 days on takeoffs. Have been changing Motul 5w-40 300V oil every 2-3 weekends.
That’s a lot of days, and I’m sure the take offs put some extra load (and fun) into the whole car. Sounds like you take really good care of it using 300V every few weekends. I guess the bearings are a wear item at that level of usage. I drive with a few friends who have 200k+ mile E46 and E90 M3. Engine bearings have been proactively replaced a few times on both cars. Still original engines, and get driven hard!

If you ever tracked engine oil or coolant temp, id be interested to see that. My car is stock except for brake pads and lines, and the engine oil doesn’t get above 230F and coolant stays in low 200s. Very impressed. BMW Genuine 0w-30 oil.
Appreciate 0
      05-30-2023, 09:10 PM   #10
iam2slow
Private
iam2slow's Avatar
United_States
79
Rep
70
Posts

Drives: 2017 M2
Join Date: Nov 2020
Location: Bay Area, CA

iTrader: (2)

I had a misfire also on my last session while WOT and it was a very hot day ~95 degrees F. Limped the car back to the paddock, cleared the code, restarted the car and everything was okay as if nothing happened… It was definitely a scary experience but I havent replaced anything since then and the cars running fine. (Happened 6k miles ago) My guess is it had something to do with the extreme heat.
Appreciate 0
      05-31-2023, 12:11 AM   #11
pal
Captain
pal's Avatar
433
Rep
753
Posts

Drives: Z4 M Coupe
Join Date: Nov 2007
Location: Seattle, WA

iTrader: (2)

I changed the plugs and coil packs and did another track day on May 19th. I ran the car with stock tune for the first session (Dinan ByPass mode) and Stage 1 for the rest of the day (5 additional sessions). Car ran like a top. It was cooler though with a high of low 70 degrees for ambient, but this track has higher speeds and longer time at WOT (see video below). The one thing I noticed right after changing the plugs and coils, even on the test drive right after the job, is that the car felt noticeably a touch stronger and throttle crisper.

The only logging I was running are the channels that AiM Solo2 DL records through OBDII - MAF, MAP, PPS, TPS, RPM, IAT.

I change the oil every 4-5 track days with Motul Xcess 5w40 or Valvoline Euro 5w40. My car has around 32K miles and 51 track days.

Appreciate 1
      05-31-2023, 11:26 AM   #12
E90convert
Lieutenant
United_States
154
Rep
402
Posts

Drives: F87 M2 DCT, F15 X5
Join Date: Dec 2014
Location: Central Ohio

iTrader: (0)

Quote:
Originally Posted by pal View Post
I changed the plugs and coil packs and did another track day on May 19th. I ran the car with stock tune for the first session (Dinan ByPass mode) and Stage 1 for the rest of the day (5 additional sessions). Car ran like a top. It was cooler though with a high of low 70 degrees for ambient, but this track has higher speeds and longer time at WOT (see video below). The one thing I noticed right after changing the plugs and coils, even on the test drive right after the job, is that the car felt noticeably a touch stronger and throttle crisper.

The only logging I was running are the channels that AiM Solo2 DL records through OBDII - MAF, MAP, PPS, TPS, RPM, IAT.

I change the oil every 4-5 track days with Motul Xcess 5w40 or Valvoline Euro 5w40. My car has around 32K miles and 51 track days.

Thanks for sharing. Great IATs, barely over 100 after the long straight! I bet that really gets the brakes hot. I assume you have an upgraded intercooler?
Appreciate 0
      05-31-2023, 02:59 PM   #13
pal
Captain
pal's Avatar
433
Rep
753
Posts

Drives: Z4 M Coupe
Join Date: Nov 2007
Location: Seattle, WA

iTrader: (2)

Yea, I do have an upgraded intercooler. It’s the Evolution Racing one.
Appreciate 0
      06-03-2023, 11:48 AM   #14
GasBurnlife(landapanda)
Captain
573
Rep
683
Posts

Drives: BMW M2
Join Date: Aug 2012
Location: Ashburn, Virginia

iTrader: (0)

E90convert I am at the track today and checked temperatures. Coolant was just under 200, and oil temps in the 225 to 228 range.
Appreciate 0
      06-03-2023, 12:41 PM   #15
E90convert
Lieutenant
United_States
154
Rep
402
Posts

Drives: F87 M2 DCT, F15 X5
Join Date: Dec 2014
Location: Central Ohio

iTrader: (0)

Quote:
Originally Posted by GasBurnlife(landapanda) View Post
E90convert I am at the track today and checked temperatures. Coolant was just under 200, and oil temps in the 225 to 228 range.
Thanks, stock tune? Good to hear the good temps even with the upgraded 200 TW tires aren’t overwhelming the stock cooling
__________________
‘18 F87 M2 DCT
'17 F15 X5 xDrive35i M-Sport
Sold in 2023 '12 F30 335i 8AT Sport Line
Sold in 2020 '08 E92 335xi 6MT
Sold in 2016 '08 E90 335i 6MT - FBO
Appreciate 0
      06-04-2023, 09:30 PM   #16
GasBurnlife(landapanda)
Captain
573
Rep
683
Posts

Drives: BMW M2
Join Date: Aug 2012
Location: Ashburn, Virginia

iTrader: (0)

Yep - stock power. I think the tires will not play a role here. You’d need to increase boost to SR oil and coolan temps climb. Stickier rubber will put more stress on the diff, but I didn’t have any temp issues even when running the 275 equivalent Michelin takeoffs.
Appreciate 1
      06-05-2023, 07:48 AM   #17
E90convert
Lieutenant
United_States
154
Rep
402
Posts

Drives: F87 M2 DCT, F15 X5
Join Date: Dec 2014
Location: Central Ohio

iTrader: (0)

Quote:
Originally Posted by GasBurnlife(landapanda) View Post
Yep - stock power. I think the tires will not play a role here. You’d need to increase boost to SR oil and coolan temps climb. Stickier rubber will put more stress on the diff, but I didn’t have any temp issues even when running the 275 equivalent Michelin takeoffs.
That’s good to hear the stock cooling system can handle the extra grip! I think the extra grip is going to work the cooling system more because you can stay on the power longer (brake later) and get on the power earlier (corner exit). Small changes on a single corner, but in a 20 minute session it can add up. On the M2 at least, it is not a meaningful amount of thermal load increase. Likely because the M3/4 cooling system is carried over from a higher powered and slightly heavier vehicle. And certainly work the diff more I’d be interest to see some temperature differences between street tires and take offs.
__________________
‘18 F87 M2 DCT
'17 F15 X5 xDrive35i M-Sport
Sold in 2023 '12 F30 335i 8AT Sport Line
Sold in 2020 '08 E92 335xi 6MT
Sold in 2016 '08 E90 335i 6MT - FBO
Appreciate 1
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 02:22 PM.




m2
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST