|
Tracking / Autocross / HPDE / Drifting What these cars were built for! |
|
Thread Tools | Search this Thread |
11-03-2019, 09:05 PM | #1 |
Senior Member
Join Date: Sep 2019
Drives: 2015 FRS
Location: KY
Posts: 177
Thanks: 1
Thanked 191 Times in 78 Posts
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
|
Mis-Fire diagnosis/issues
OK, I need the wisdom of the forum to help me understand or uncover the issue of the random mis-fire codes.
At Road America, first time racing the car, I had the P0300, 0301, 0303 codes for random, cyl 1, and cyl3 mis fire codes. The car was on original plugs/coils, so we put all new plugs/coils after that event, and at Gingerman, car never seemed to mis-fire, but it's also a shorter track that didn't really get the car deep into 5th gear, where it routinely mis fired at RA. It was very slight so didn't hamper performance that much, and could be driven through. Fast forward to today, at NCM for the first time, and immediately starts mis-firing, as there are some high speed sections. However, this time, is gives P0300, and 0200 for random and Cyl 2 mis-fires, and they could be felt, massively even at lower speeds. Also, while the CEL is flashing, the TC light also comes on (the one that is off when the Pedal dance mode is engaged)….it was so bad I thought it was fuel starving, so pitted, put more gas in, went back out, and same thing happened once back up to speed. So besides burning up another coil in such a short time, what else could cause mis-fires like this? I have a ACT street-lite flywheel, Fluidamper harmonic damper, Antigravity lithium battery....trying to think of anything else that could possibly affect crank position sensors or ignition. I have vents in the hood. Car makes 200 WHP on E85. Could the combination of the LWFW, plus the Fluidamper harmonic damper (which is OE size but 1lb heavier) be causing crank position sensor issues at high RPM? Do these cars just go through coils this much? The car has literally been run for 11-12 sessions (20 min or less) on track since the all new coils/plugs. Thanks for the input in advance!
__________________
'15 FRS - GLTC spec
YouTube channel race vids: https://www.youtube.com/channel/UClU...phsppnA/videos |
11-04-2019, 12:53 AM | #2 |
Senior Member
Join Date: Jun 2012
Drives: Nevermorange FRS
Location: Seattle, WA
Posts: 4,160
Thanks: 755
Thanked 4,200 Times in 1,803 Posts
Mentioned: 77 Post(s)
Tagged: 1 Thread(s)
|
It may not be the heat whilst in motion but when at rest. Heat soak is a helluva thing. Just how coils can die, so can sensors. What’s your cool down lap look like and how long do you run the fans after a session?
__________________
SCCA T4 - FRS
Last edited by rice_classic; 11-04-2019 at 02:44 AM. |
11-04-2019, 08:39 AM | #3 |
Senior Member
Join Date: Nov 2016
Drives: 2013 BRZ Limited 6MT
Location: Nashville, TN
Posts: 208
Thanks: 36
Thanked 80 Times in 58 Posts
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
|
Check you direct injection seals. That is a pretty well documented issue on these cars.
I had a coil go bad midway through Saturday at NCM after having paid for the whole weekend |
11-04-2019, 09:42 AM | #4 |
Senior Member
Join Date: Sep 2019
Drives: 2015 FRS
Location: KY
Posts: 177
Thanks: 1
Thanked 191 Times in 78 Posts
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
|
I don't have fans running after the session, but I do try to remember to pop the hood. Not to mention, both the last two times at track were in cool conditions (60 deg or less).
__________________
'15 FRS - GLTC spec
YouTube channel race vids: https://www.youtube.com/channel/UClU...phsppnA/videos |
11-04-2019, 09:48 AM | #5 |
Senior Member
Join Date: Sep 2019
Drives: 2015 FRS
Location: KY
Posts: 177
Thanks: 1
Thanked 191 Times in 78 Posts
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
|
Thx. Sorry to hear that. I was supposed to be there Saturday as well, but a funeral delayed me until Sunday.
__________________
'15 FRS - GLTC spec
YouTube channel race vids: https://www.youtube.com/channel/UClU...phsppnA/videos |
11-04-2019, 09:58 AM | #6 |
Senior Member
Join Date: May 2014
Drives: BRZ
Location: Fargo, ND
Posts: 968
Thanks: 124
Thanked 327 Times in 236 Posts
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
|
My local track has a long stretch of 5th gear. I have a 2013 BRZ, still on original plugs and coils. Never had a coil fail yet. I must be stupid lucky, maybe it cause i still have the OEM overpipe?
Maybe time to add the outside vents on your hood to help with temps? (I know you said it was cold air temps) I would be curious on the flywheel, I know I have head of them causing misfire issues on other applications, but usually when paired with a lighter crank pully. |
11-04-2019, 10:55 AM | #7 | |
Senior Member
Join Date: Sep 2019
Drives: 2015 FRS
Location: KY
Posts: 177
Thanks: 1
Thanked 191 Times in 78 Posts
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
|
Quote:
I'm thinking about testing the OEM damper along with the Exedy LWFW which is another 1lb heavier than the ACT version, to see if that gets rid of the "phantom" random misfire code. That said, the car had some real misfiring going on, along with P0302, so something in the ignition system def. wasn't working properly, which leads me to think that in fact Cyl 2 coil is dead again. I noticed a big drop-off in fuel economy this weekend, which coincides with mis-firing. At Gingerman it was fine, and fuel economy was really good, and no mis-fires.
__________________
'15 FRS - GLTC spec
YouTube channel race vids: https://www.youtube.com/channel/UClU...phsppnA/videos |
|
11-04-2019, 11:53 AM | #8 | |
Senior Member
Join Date: Jul 2018
Drives: 2014 Scion FR-S
Location: Sarasota, FL
Posts: 427
Thanks: 499
Thanked 276 Times in 178 Posts
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
|
Quote:
Sorry for wall of text. Hope it helps. Edit: a good way to confirm this would be to log AFR, fuel trims, and turn on the cylinder misfire channels if using Ecutek.
__________________
|
|
The Following User Says Thank You to MCTeeJ For This Useful Post: | rice_classic (11-04-2019) |
11-05-2019, 07:49 AM | #9 | |
Senior Member
Join Date: Sep 2019
Drives: 2015 FRS
Location: KY
Posts: 177
Thanks: 1
Thanked 191 Times in 78 Posts
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
|
Quote:
Ran like a champ at Gingerman, but there was only 1 place on the track that I even got into 5th gear, so not as much chance to expose any ongoing misfire there, so it still could have been there, just not exposed like at Road America and NCM. Will run some E85 injector cleaner through the system as well, to see if that helps as well.
__________________
'15 FRS - GLTC spec
YouTube channel race vids: https://www.youtube.com/channel/UClU...phsppnA/videos |
|
The Following User Says Thank You to prandelia For This Useful Post: | MCTeeJ (11-05-2019) |
11-05-2019, 08:37 AM | #10 |
...
Join Date: Mar 2012
Drives: Yes
Location: MD
Posts: 391
Thanks: 34
Thanked 80 Times in 64 Posts
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
|
I had one of these codes over the summer, and one of the direct injectors was the culprit.
|
11-05-2019, 11:54 AM | #11 | |
Senior Member
Join Date: Jul 2018
Drives: 2014 Scion FR-S
Location: Sarasota, FL
Posts: 427
Thanks: 499
Thanked 276 Times in 178 Posts
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
|
Quote:
__________________
|
|
12-13-2019, 08:11 AM | #12 |
Senior Member
Join Date: May 2015
Drives: unlimited cheap build N/A track car
Location: TN
Posts: 101
Thanks: 12
Thanked 55 Times in 32 Posts
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
|
I have a 8 pound aluminum flywheel on my track car and no misfire issues. I would look elsewhere.
|
12-13-2019, 07:28 PM | #13 |
Join Date: Jul 2012
Drives: S2000 CR
Location: Orange County
Posts: 14,527
Thanks: 8,916
Thanked 14,174 Times in 6,833 Posts
Mentioned: 966 Post(s)
Tagged: 14 Thread(s)
|
Do you have a datalog and video?
|
12-14-2019, 01:20 PM | #14 |
Senior Member
Join Date: Sep 2019
Drives: 2015 FRS
Location: KY
Posts: 177
Thanks: 1
Thanked 191 Times in 78 Posts
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
|
Well, I finally confirmed something. It seems a lot of information out there says the 13-14 had the "old" wiring harness/coils, and the new one is in '15. Well, I have a '15 and thought I was good, but turns out that the old system was used about halfway through '15, and I have the old coil/harness.
Not that it's a fix-all, but I'm going to update to the new harness/coils, add more heat shielding (even though I have double sided ceramic coated Ace headers from CSG), and see how things go. I might even use the "better" coils from Cusco or another brand to help with high RPM use.
__________________
'15 FRS - GLTC spec
YouTube channel race vids: https://www.youtube.com/channel/UClU...phsppnA/videos |
|
|
Thread Tools | Search this Thread |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Help Diagnosis This Coilover Sound (video included) | ett808 | Suspension | Chassis | Brakes -- Sponsored by 949 Racing | 12 | 11-10-2018 09:33 PM |
Suspension Diagnosis | AZ94 | Suspension | Chassis | Brakes -- Sponsored by 949 Racing | 9 | 02-10-2018 08:18 PM |
Axle diagnosis | protpibe | Engine, Exhaust, Transmission | 4 | 05-11-2015 12:32 PM |
Need a brake diagnosis | muffinz | Suspension | Chassis | Brakes -- Sponsored by 949 Racing | 9 | 02-27-2015 11:56 PM |
Subaru TSB: 02-136-12R - Oil Seepage Diagnosis and Repair Procedures. | ATL BRZ | Issues | Warranty | Recalls / TSB | 10 | 10-17-2014 02:34 PM |