Once the whine started it was most likely constant but I could only hear it at low
RPM due to my exhaust, road noise and wind noise, etc. If it weren't for driving down my alley with the windows down I might not have even heard it. It was a very subtle sound. When the P061F error would occur, most of the time I would just restart the truck. Sometimes I'd reprogram but normally just the restart and continue on. Oh and when that error does happen the truck is practically a paperweight. Feels like it's running on one cylinder or something. So I'd limp over to the side of the road or into a parking lot and restart. The error has never occurred in stock.
Looking forward to hearing about the Gryphon!