Misfire issue under boost.
I was completely unsure where to even put this. So I guess here is probably the best area.
I recently installed a BRP MP62 Kit on my Miata (which was a complete nightmare, story for another time) along with a fully loaded FM Link. (knock sensor, screen, etc). Between 4800 and 6000 I get a weird, harsh misfire that doesn't seem to appear on data logs. My afr will spike for a fraction of a second, barely long enough for my eyes to register it (~14ish area) right after the misfire happens. I have the NGK 7 range spark plugs bought directly from flying miata, gapped at 0.035. Anyone have any ideas? I was thinking spark blowout. I'm out if town and won't be home until late Monday. I would like to get ideas on things to try when I get home |
Probably spark blowout, reduce gap.
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^agree. How much boost are you making?
I’m running about 13 psi, gapped to 0.030” and don’t have blowout anymore. |
Originally Posted by Schroedinger
(Post 1461541)
^agree. How much boost are you making?
I’m running about 13 psi, gapped to 0.030” and don’t have blowout anymore. Ill drop the gap to 0.025 when I get back. |
If you are running the stock coils, then reducing the gaps will help.
Such a misfire with a COP setup indicates you'll be running on 3 cylinders very soon. I went through a few coils that way. |
Originally Posted by Godless Commie
(Post 1461563)
If you are running the stock coils, then reducing the gaps will help.
Such a misfire with a COP setup indicates you'll be running on 3 cylinders very soon. I went through a few coils that way. |
It might also be that your coil pack is going. What year is your car?
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Thanks for replying gthill. I apologize I never came back and updated this.
I gapped my plugs to 0.028 (from 035) and it completely cured the issue! I appreciate the suggestions from above. |
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