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File 3 to 4 stutter safety .csv, File stutter.csv
Added November 17, 2020 by jnh18
Running lean. No codes are thrown, but jb4 will go to safety map 4 for AFR lean condition. It feels like it's running lean, no top end power under WOT and can feel a bit of surging/hiccuping in upper RPM range. Under WOT, shifting from 3rd to 4th gear always results in engine immediately falling flat on its face: it stutters hard and cannot gain revs despite full throttle. If WOT is maintained for ~2 seconds during this heavy stuttering upon shifting to 4th, JB4 will go to safety map 4 for AFR lean condition. DME does not throw any codes. Fuel Open Loop always ends up stuck at 90. I have set to 70 several times and each time, it will be set back to 90 and not change within a drive session.
  • 91 Octane
Running lean. No codes are thrown, but jb4 will go to safety map 4 for AFR lean condition. It feels like it's running lean, no top end power under WOT and can feel a bit of surging/hiccuping in upper RPM range. Under WOT, shifting from 3rd to 4th gear always results in engine immediately falling flat on its face: it stutters hard and cannot gain revs despite full throttle. If WOT is maintained for ~2 seconds during this heavy stuttering upon shifting to 4th, JB4 will go to safety map 4 for AFR lean condition. DME does not throw any codes. Fuel Open Loop always ends up stuck at 90. I have set to 70 several times and each time, it will be set back to 90 and not change within a drive session.
Datalog File: 
File 3 to 4 stutter safety .csv
File stutter.csv
Fuel Type: 
91 Octane