05-15-2023, 12:26 AM | #1 |
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[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. |
05-17-2023, 11:51 AM | #2 |
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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
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05-17-2023, 12:40 PM | #3 |
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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.
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05-17-2023, 06:18 PM | #4 |
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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. |
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05-18-2023, 01:44 PM | #5 | |
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You could be due for plugs and coils especially after 21 track days, but don't hesitate to yank that piggy back tune out.
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05-29-2023, 04:12 PM | #6 |
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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. |
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05-29-2023, 05:05 PM | #7 | |
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05-30-2023, 06:17 PM | #9 | |
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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. |
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05-30-2023, 09:10 PM | #10 |
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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.
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05-31-2023, 12:11 AM | #11 |
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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. |
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05-31-2023, 11:26 AM | #12 | |
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06-03-2023, 12:41 PM | #15 |
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Thanks, stock tune? Good to hear the good temps even with the upgraded 200 TW tires aren’t overwhelming the stock cooling
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06-04-2023, 09:30 PM | #16 |
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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.
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06-05-2023, 07:48 AM | #17 | |
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