im having a kinda weird problem with my 93 prelude. its a jdm h22 with bolt-ons. aem fuel regulator and 255 lph walbro pump and tuned on crome. when i first crank the car the afr looks great around 14.3 and gradually starts gettting leaner as it warms up. And all of a sudden it will go to 12.0. the fuel pressure stays constant. and the gauge is correct because i compared it with the one at the dyno when i had it tuned and it matched perfect the whole time. i was wondering if anyone else has experienced this. is this just another one of cromes bugs. it doesnt seem to affect the wot afr. and i am running in open-loop mode. maybe i should have another o2 bung welded in and use my stock narrowband so i can run in closed-loop. i didnt just because this is not a daily driver. any help is greatly appreciated.

josh

 

I'll blame Crome just for the hell of it....

 

yeah, im thinking the problem is crome too. i just cant think of anything else that could cause this. ive tried 2 different ecu's also with no luck. i think ill try getting my stock 02 back in and running in closed loop to see what happens. anyone have any other ideas?