Hi!
I've probably read 20+ threads regarding this topic, without finding a solution to my problem.
Misfire at 6000rpm+, mostly in 3rd or 4th gear when starting pull from below 4000rpm.
9/10 times cylinder 5.
HPFP mostly stays above 2000psi, but when it misfires it sometimes dives to like 1500psi for a brief second. But I don't know if it's a consequence of the engine shutting the cylinder and switching fuel mode.
Some of the things I tested:
What I've noticed though is that it seems to be happier if I run it a little leaner than I want to.
12.5 AFR seems to work better, while 12 AFR would misfire every pull.
I can rule out any internal engine damage, I've replaced piston rings, cleaned valves etc and took the time to make sure that everything is alright.
I also tried running with another engine block/head, and still got the issue.
The car is AT with hybrid twins, PI on 100% E85.
Log with misfire: https://datazap.me/u/kulixo/missfire?log=0&data=21
Any suggestions? I feel like I've tried most of the common stuff.
Maybe O2-sensors, but they don't throw any codes.
I've probably read 20+ threads regarding this topic, without finding a solution to my problem.
Misfire at 6000rpm+, mostly in 3rd or 4th gear when starting pull from below 4000rpm.
9/10 times cylinder 5.
HPFP mostly stays above 2000psi, but when it misfires it sometimes dives to like 1500psi for a brief second. But I don't know if it's a consequence of the engine shutting the cylinder and switching fuel mode.
Some of the things I tested:
- 1 step colder plugs (0.0018")
- PR coils
- Index 12 injectors (also made sure they seal properly)
- Turned of misfire detection above 6000rpm
- MSD81
What I've noticed though is that it seems to be happier if I run it a little leaner than I want to.
12.5 AFR seems to work better, while 12 AFR would misfire every pull.
I can rule out any internal engine damage, I've replaced piston rings, cleaned valves etc and took the time to make sure that everything is alright.
I also tried running with another engine block/head, and still got the issue.
The car is AT with hybrid twins, PI on 100% E85.
Log with misfire: https://datazap.me/u/kulixo/missfire?log=0&data=21
Any suggestions? I feel like I've tried most of the common stuff.
Maybe O2-sensors, but they don't throw any codes.
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