Hey all,
A weird issue that is doing my head in.
Giving the car a half throttle squirt getting into some boost but not full throttle, then backing off, the air fuel ratio returns to 14.7 after tipout however quickly drifts off to 10.5 and stays there at all loads-idle, accelerating, cruising. This rich afr lasts for around a minute then returns to stoich.
Now on the logging during this period I can see injector ms has definitely increased but nothing seems to trigger/change during this rich condition.
The fuel pressure remains constant and is not sticking high. Fuel source remains closed loop the whole time. Torque sources remain driver demand.
Short term/Long term trims are close enough to 1.0 all the time but during this period the short term winds out to 0.70-with no reason why, then a minute later its back to 1.0 and car is no longer rich. Seems to be the only thing in the log changing during this period.
All vitals/temperatures read as normal.
The car misfires during this period as its so rich.
Flat out back to back dyno runs or drag strip runs this issue never shows it self. Literally only with squirts of less than full throttle.
Any ideas?