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The crank sprocket has two drilled holes which are the perfect size for tapping an 8mm tread. Why didn't the factory finish the job? who knows?

I had a similar issue on an 2008 legacy. Came in running, changed timing belt, would not start, just popped and backfired. Took it apart examined everything, just popped. Took apart again and noticed the teeth had a worn look like they had been grinding on the sensor. Put a good used one on and it ran fine! Spookey.

David King
Owner/Technician
David King
Vancouver, Washington, USA