Knock Retard at VTEC transition

FK2 Civic Type R 2015-2017 and FK8 Civic Type R 2017-2018
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Centripetal
Posts: 14
Joined: Sun Mar 15, 2020 11:04 am

Knock Retard at VTEC transition

Post by Centripetal »

I'm starting to troubleshoot at knock retard that occurs on cylinder 1, which often occurs near a VTEC on-to-off transition. It does not always occur so that makes me think it might be something rattling around. Perhaps, valve lash? I remember my RSX had surprisingly tight exhaust valve lash.
Any troubleshooting suggestions are appreciated.

Example datalog on factory calibration:
knock_retard_at_vtec.fpdl
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Attachments
knock_retard_at_vtec.png
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