I have an issue with my fuel trims swinging wildly rich at 0 degrees VTC. Attached are my kal and a log.
Last year I meticulously corrected my fuel maps, such that they were generally within 1-2% in all cells at all cam angles. This summer I've been playing with different cam angles at part throttle, chasing fuel economy. I've noticed that at 0 degrees VTC, something weird happens that I had not observed at 10, 20 or 30 degrees: I can be driving along at a steady speed, and randomly the AFR will begin to drop, to the point that my fuel trims max out and AFR starts swinging rich. I've seen AFR drop by more than 20% with no noticeable changes to any other sensors. However, if I toss it in neutral and blip the throttle, it will return to normal for a few minutes.
In the screenshot below you can observe this.
Is this possibly the evap system feeding fuel vapors? I can't think of anything else that would cause it.
Fuel trims swinging wildly rich at 0° VTC
Fuel trims swinging wildly rich at 0° VTC
- Attachments
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- TSX v4.2 91 octane ethanol free-200730-002.kdl
- (4.54 MiB) Downloaded 134 times
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- TSX v4.2 91 octane ethanol free.kal
- (164.61 KiB) Downloaded 113 times
Re: Fuel trims swinging wildly rich at 0° VTC
Verified this morning, it doesn't happen with 10 degrees of cam advance. Fuel trims stayed right where they were supposed to, rather than drifting wildly like they do on 0 degrees.
This morning:
Yesterday:
This morning:
Yesterday:
Re: Fuel trims swinging wildly rich at 0° VTC
Are you using live tuning, and if so what tables are set for live tuning?
Re: Fuel trims swinging wildly rich at 0° VTC
No live tuning tables.
Re: Fuel trims swinging wildly rich at 0° VTC
Have you discussed this with your tuner?
Re: Fuel trims swinging wildly rich at 0° VTC
I am the tuner.
This is a basically stock TSX motor with a 40° VTC, running the modified basemap for a K24A2.
This is a basically stock TSX motor with a 40° VTC, running the modified basemap for a K24A2.
Re: Fuel trims swinging wildly rich at 0° VTC
Glad it worked out, but why is this a problem on 0 degree only? I have similar issue...also what would the live tuning have to do with it?