I have an issue where my trims are good most of the time, but frequently it will show 10-15% negative trims for a few seconds, then return to normal? It happens at idle, as well as cruising speeds ive noticed. It wouldnt really bother me as much if it didnt throw system rich codes occasionally. I cant make any sense of it as its in the same cell that its ~-3% then randomly shows ~-15% then returns. My startups are also stupid rich and I cant seem to get that dialed in either, if I lean out the area its reading lean on startups, its then running lean trims after driving it. It seems to do this regardless if its hot start or cold start, and im unsure if its related to the first issue.
In this log you can see the startup richness, and at the end of the log you can see the trims shooting around at idle.
The injector flow rate is correct, just scaled 25% I know that throws some guys off.
Lost on this one, it seems like theres 2 seperate trims being made under the same conditions.
Im currently playing with the transient warmup base gain table to try and get the cold starts to not be so rich, id hope thats the correct table to mess with for that. My first idea was inj tip temp but im not sure if that table can go negative or not.
SporaticTrims.hplidkwtfimdoing6.hpt
Also here is a log of a hot start, it will occasionally surge like this, this was after a ethanol composition change, but it will surge like this on hotstarts, ive found simply giving it a rev will clear it up. In this log you can see the same strange fuel trim behavior, but the wideband tells the same story as the narrowbands.Rich surge.hpl