Single Cylinder Misfire - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

B T · 09-29-2021, 05:18 PM

Hey guys, I have a single cylinder misfire that's been going on ever since I built my engine. Really don't want to tear it back apart as I'm in an apartment right now. Only happens on Cylinder #1, hot/cold doesn't matter. I've tried swapping/replacing plugs and coils but it always stays on the same cylinder. Any ideas on other things to test?

Ultramaroon · 09-29-2021, 06:48 PM

Injectors

Compression on all four. Is #1 lower than the others?

blsfrs · 09-30-2021, 09:05 AM

Is the engine actually missing or are just getting P0301 or both?

B T · 09-30-2021, 09:24 AM

It doesn't sound like it's missing to me, but its throwing the P0301 code, so my tuner backed out of timing.

FrickingReallySlow · 09-30-2021, 02:01 PM

Also SC'ed and I occasionally get a misfire on cyl#1 but I would only see it if I do a ecutek log, don't hear anything or see any engine codes. Tried logging lots of parameters but nothing really coincides with it. My DT tune never uses any port injection only DI and always wondered if that's a problem.

How often do you get it? like once in a 30min drive?

09-29-2021, 06:48 PM	#2
Ultramaroon not playing cards Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 32,394 Thanks: 53,054 Thanked 37,230 Times in 19,309 Posts Mentioned: 1118 Post(s)	Injectors Compression on all four. Is #1 lower than the others? __________________ service manuals

09-30-2021, 09:05 AM	#3
blsfrs Senior Member Join Date: Dec 2018 Drives: 2013 frs base Location: central Virginia Posts: 1,469 Thanks: 2,801 Thanked 1,486 Times in 702 Posts Mentioned: 13 Post(s)	Is the engine actually missing or are just getting P0301 or both? Last edited by blsfrs; 09-30-2021 at 09:08 AM. Reason: "or both"

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09-29-2021, 05:18 PM	#1
B T Senior Member Join Date: May 2015 Drives: 15 BRZ, 2003 MR2, '70 Elky, 06 TBSS Location: Mobile, Alabama Posts: 538 Thanks: 211 Thanked 230 Times in 159 Posts Mentioned: 7 Post(s)	Single Cylinder Misfire Hey guys, I have a single cylinder misfire that's been going on ever since I built my engine. Really don't want to tear it back apart as I'm in an apartment right now. Only happens on Cylinder #1, hot/cold doesn't matter. I've tried swapping/replacing plugs and coils but it always stays on the same cylinder. Any ideas on other things to test?

09-30-2021, 09:24 AM	#4
B T Senior Member Join Date: May 2015 Drives: 15 BRZ, 2003 MR2, '70 Elky, 06 TBSS Location: Mobile, Alabama Posts: 538 Thanks: 211 Thanked 230 Times in 159 Posts Mentioned: 7 Post(s)	It doesn't sound like it's missing to me, but its throwing the P0301 code, so my tuner backed out of timing.

09-30-2021, 02:01 PM	#5
FrickingReallySlow Senior Member Join Date: Jun 2021 Drives: 2015 FR-S Location: San francisco Posts: 368 Thanks: 161 Thanked 157 Times in 103 Posts Mentioned: 8 Post(s)	Also SC'ed and I occasionally get a misfire on cyl#1 but I would only see it if I do a ecutek log, don't hear anything or see any engine codes. Tried logging lots of parameters but nothing really coincides with it. My DT tune never uses any port injection only DI and always wondered if that's a problem. How often do you get it? like once in a 30min drive?

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