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      06-06-2023, 02:44 PM   #1
HA55L3R
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High RPM misfire help

I'm having bad misfires around 7k RPM on my car and can't figure out the cause. I've tried cleaning the MAF, put in new coils and plugs gapped to 0.022", put in fresh gas and injector cleaner (ran the tank empty after and filled with fresh 93). Not throwing any codes and an ISTA scan showed nothing.

The car is FBO pure stage 2 HF and was running fine in the fall until i blew a turbo. I had them both rebuilt by Pure and added a Wagner TMIC over the winter. The motor has roughly 16k miles on it and compression is perfect on all cylinders. Below are some logs i took, any insight from someone who knows logs better than me would be greatly appreciated!


https://www.bootmod3.net/log?id=646f...729bf6613bda9e
https://www.bootmod3.net/log?id=6470...90c66243bfec90
https://www.bootmod3.net/log?id=6470...90c65e4a82b9b3
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      06-10-2023, 09:09 PM   #2
LB Auto
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hello friend, I believe that your problem is spark plugs try to put the 97506 with a gap of 0.060.
if it doesn't solve it we can think that the ignition coils may be defective.
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      06-12-2023, 01:33 PM   #3
HA55L3R
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I just put in new 97506 plugs gapped to 0.022" and new coils but it didn't change anything. A 0.060" gap seems way too large
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      06-13-2023, 11:11 AM   #4
Joy15779
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check sparks gap. I solved with 0.20 ngk
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      06-13-2023, 11:38 AM   #5
JAI///M3
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I think the .060 recommendation should have specified mm. It makes all the difference in the world.
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      06-14-2023, 09:07 AM   #6
HA55L3R
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Quote:
Originally Posted by Joy15779 View Post
check sparks gap. I solved with 0.20 ngk
Plugs are brand new and i personally gapped them to 0.022". I'm running 93, i thought 0.020" was for ethanol?

Also, just ordered new injectors and o2 sensors in hopes that it will fix the problem
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      06-14-2023, 04:16 PM   #7
Joy15779
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Quote:
Originally Posted by HA55L3R View Post
Plugs are brand new and i personally gapped them to 0.022". I'm running 93, i thought 0.020" was for ethanol?

Also, just ordered new injectors and o2 sensors in hopes that it will fix the problem
no dear, my case was so pushed that 0,20 was for ron100

then works with ethanol today, as on today I've never overcame 30% e85, other guys a scaring me but.... slowly I'm increasing
I ve bosch m5 injectors so shouldn't be troubles

with 0.22 my car hiccups but I run 2.1 bar RON100
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