I have a 2005 Silverado, 216/224 .585/.585 115+5 cam, 243 heads, otherwise stock 5.3, lsa blower with 2.45? pulley. I?ve been having problems with leans spikes. Any time I let off the throttle completely, and then first get back on it I get a spike. If I really ease on I go 15.5-16, stabbing it any harder I used to see anywhere from 17 all the way up to 20 on the wideband for a brief second before it caught itself. You could definitely feel it, and anytime the truck is below operating temp it is so bad it actually almost stalls. I seem to have my ve table dialed in correctly, I am running 2bar speed density, maf not even plugged in.
Everything I?ve read says transient fuel. However I noticed I only have the ?mass gain? table which is some type of multiplier based on airflow. I seem to be missing at least one other table. Can someone enlighten me on how to effectively use this table seeing as I have no maf to actually tell what airflow rate is when it happens. Like I said it is just brief, steady state ve numbers seem to be good.
I?ve been bumping the table up by massive percentages and I?ve seen some progress, the spikes are still there just to a lesser extent, max I see now is 17, however now I?m seeing it go rich when letting off, I assume as I?ve been bumping up the whole table, not just specific areas.
Is there a better way to really dial this in? The spikes under operating temp are still there as well, and it still feels like it will stall if I don?t touch the gas with my pinky toe only.
I am not at my computer or I?d post log and tune. I can later.