Re: Subaru EFI backfiring
Have you modified the governor to make it go faster?
Usually backfiring is the result of the throttle plate not closing all the way. On the EFI engine this might still cause the injector to keep spraying, but if the pedal is up the coil will not spark.
Not too familiar with the details on how the EFI system on that engine really works, so just spit-balling here.
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