P0300 Random cylinder misfire - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Grady · 11-27-2020, 03:31 PM

Ok so I have an annoying P0300 happening during cold starts. Have a suspicion this may just be the nature of the beast with my mods. This seemed to start right after install of torque solution engine mounts. But has seemed to progressively get worse. I have attached 2 idle logs that show all cylinders displaying misfire conditions when cold. Once the engine is warm and all power pulls have reported 0 misfires. If anyone has any thoughts or experienced similar it would be appreciated.

In testing I have replaced PI’s and spark plugs. I have not done anything with DI’s or coils.

Mods are, AVO turbo, Light weight FW, DW700 injectors, NGK Racing plugs, torque solutions engine mounts, DT flex fuel, DT remote tuning.

Edit **It is a 2017 with 29k miles**

https://drive.google.com/file/d/1MlB...w?usp=drivesdk

https://drive.google.com/file/d/12BY...w?usp=drivesdk

humfrz · 11-27-2020, 03:56 PM

I get a P0300 code on mrs humfrz's Saturn, usually after she drives it. I erase the code and it stays away till she drives it again. Rinse and repeat.

Go figure -

Yes, it is another slow day in Puyallup -

p1l0t · 11-27-2020, 06:56 PM

I know you're post said DT flex fuel kit but what fuel are you running exactly? And from what state if it's pump gas? Since it's the P0300 and not a specific cyclinder I'm not thinking it is electric, although it could be.

Sent from my SM-G975U using Tapatalk

Grady · 11-27-2020, 08:09 PM

Quote:

Originally Posted by p1l0t

I know you're post said DT flex fuel kit but what fuel are you running exactly? And from what state if it's pump gas? Since it's the P0300 and not a specific cyclinder I'm not thinking it is electric, although it could be.

Sent from my SM-G975U using Tapatalk

Seemed to happen more on E85 but has happened on 93. Electrical/spark issues generally get worse with heat so have kinda ruled out but you never know.

p1l0t · 11-27-2020, 08:57 PM

Have you tried running a bottle of injector cleaner?

Sent from my SM-G975U using Tapatalk

RZNT4R · 11-28-2020, 07:25 AM

Engine mounts and lightweight flywheel probably aren't helping

NoHaveMSG · 12-02-2020, 11:52 AM

Verify all the screws on the DI driver module are tight. They should be something like 86 in-lb.

11-27-2020, 03:31 PM	#1
Grady Senior Member Join Date: Jun 2017 Drives: BRZ Yellow, Ranger, Evora, WCM S2K Location: Dallas Posts: 1,712 Thanks: 354 Thanked 1,500 Times in 786 Posts Mentioned: 14 Post(s)	P0300 Random cylinder misfire Ok so I have an annoying P0300 happening during cold starts. Have a suspicion this may just be the nature of the beast with my mods. This seemed to start right after install of torque solution engine mounts. But has seemed to progressively get worse. I have attached 2 idle logs that show all cylinders displaying misfire conditions when cold. Once the engine is warm and all power pulls have reported 0 misfires. If anyone has any thoughts or experienced similar it would be appreciated. In testing I have replaced PI’s and spark plugs. I have not done anything with DI’s or coils. Mods are, AVO turbo, Light weight FW, DW700 injectors, NGK Racing plugs, torque solutions engine mounts, DT flex fuel, DT remote tuning. Edit It is a 2017 with 29k miles https://drive.google.com/file/d/1MlB...w?usp=drivesdk https://drive.google.com/file/d/12BY...w?usp=drivesdk Last edited by Grady; 11-27-2020 at 04:19 PM.

12-02-2020, 11:52 AM	#7
NoHaveMSG Senior Member Join Date: Jan 2018 Drives: Crapcan Location: Oregon Posts: 11,612 Thanks: 18,893 Thanked 16,899 Times in 7,691 Posts Mentioned: 112 Post(s)	Verify all the screws on the DI driver module are tight. They should be something like 86 in-lb. __________________ "Experience is the hardest kind of teacher. It gives you the test first and the lesson afterward." -Oscar Wilde.

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11-27-2020, 03:56 PM	#2
humfrz Senior Member Join Date: May 2013 Drives: 2013 FR-S, white, MT Location: Puyallup, WA Posts: 30,436 Thanks: 29,833 Thanked 32,866 Times in 16,849 Posts Mentioned: 717 Post(s)	I get a P0300 code on mrs humfrz's Saturn, usually after she drives it. I erase the code and it stays away till she drives it again. Rinse and repeat. Go figure - Yes, it is another slow day in Puyallup -

11-27-2020, 06:56 PM	#3
p1l0t Senior Member Join Date: Jan 2016 Drives: 2016 Subaru BRZ Hyperblue Location: West Hartford, CT Posts: 8,481 Thanks: 22,744 Thanked 9,441 Times in 4,849 Posts Mentioned: 58 Post(s)	I know you're post said DT flex fuel kit but what fuel are you running exactly? And from what state if it's pump gas? Since it's the P0300 and not a specific cyclinder I'm not thinking it is electric, although it could be. Sent from my SM-G975U using Tapatalk

11-27-2020, 08:57 PM	#5
p1l0t Senior Member Join Date: Jan 2016 Drives: 2016 Subaru BRZ Hyperblue Location: West Hartford, CT Posts: 8,481 Thanks: 22,744 Thanked 9,441 Times in 4,849 Posts Mentioned: 58 Post(s)	Have you tried running a bottle of injector cleaner? Sent from my SM-G975U using Tapatalk

11-28-2020, 07:25 AM	#6
RZNT4R Professional Mechanic Join Date: Apr 2010 Drives: 2017 86 6MT Oceanic Location: Quebec, Canada Posts: 789 Thanks: 17 Thanked 634 Times in 371 Posts Mentioned: 12 Post(s)	Engine mounts and lightweight flywheel probably aren't helping

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