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

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 - :iono:

Yes, it is another slow day in Puyallup - :sigh:

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.

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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.

Have you tried running a bottle of injector cleaner?

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Engine mounts and lightweight flywheel probably aren't helping

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