do you have long tubes?
i had a similar problem failed for HCs ... here's what i ended up doing:
a little background first ... my injectors are rated for 30# at 43 psi. so my tune says 30 for the high and low slopes. but since my rail pressure is less than 43 psi, they actually flow closer to 27-28#. so the adaptive logic in the computer had been compensating and adding fuel, and my KAMRF values were around 1.15 or so.
so i had made this plan to get the tank get down to about 1/4 or so and then i was going to add rubbing alcohol just before going thru again to lower the HCs. but i am so absent minded that i completely forgot to add the alcohol before getting in line, and did not realize it until i was at the front of the line. that was my "oh !@#$ moment.
then i realized that if i reset the computer and cleared the KAMs, then it would start running lean again, maybe lean enough to lower my HCs enough to pass. so i reset it and went through. and i passed!
would i recommend doing it the way i did it? only if you want to be absent minded and cause yourself unnecessary stress
but the alcohol thing still seems like a good idea
you could lower the first few values in your MAF Transfer function to cause the computer to provide less fuel at idle.
