The only thing that changes when the AFR drops is manifold pressure. Nothing in the tune that would effect AFR is changing. All parameters are nice and steady. Something is allowing extra air into the intake manifold until ECT hits 172 degrees. At that point, the "leak" stops, manifold pressure drops, and AFR drops.
Last edited by OnTheChip; 04-24-2020 at 09:26 AM..
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