Yeah I figured that changing the MAF transfer function wasn't the best way to deal with the idle issues I'm having, but the base fuel table only goes down to 1000 RPM. The long term trims were originally off by roughly 10-20% in low MAF counts so I adjusted the MAF transfer function to get them closer to 1. The car seemed to run a lot better after this.
Update on the idle issue:
I multiplied my original values in the isc_Neutral_idle_air table (from 1392 RPM and below) by 1.2 to see if the surging would stop, and it did seem to get quite better, but now at least half of the time I decelerate to idle, the idle hangs around 1300-1400 RPM. Sometimes it stays there until I accelerate again, and sometimes it will eventually drop back to my set idle of 750 RPM. When it goes to 750 RPM, it has never jumped back up to 1300-1400 RPM, though. Is there any other possible settings that could be making the RPMs hang, or did I probably just multiply by too much? The idle_speed_RPM_adder_for_ACT (inlet air temp) table is all set to zero, so it couldn't be that. However, the idle_speed_RPM_adder_for_ECT (coolant temp) table has different values in it, but the max value of 504 for added RPM is only when coolant temp is at -256 and -20, which seem to be impossible values to come across when the engine is running.
Here's what my isc_Neutral_idle_air table looks like after the 1.2 multiplication:
DSDRPM --- AIR_#/M
4095.9375 --- 2.0000
4080.0000 --- 2.0000
1792.0000 --- 0.9399
1392.0000 --- 0.9116
720.0000 --- 0.4922
520.0000 --- 0.3599
0.0000 --- 0.3242
0.0000 --- 0.3242
0.0000 --- 0.3242
Now this may be a stupid question, but I see that my target idle RPM of 750 is not listed in the left of the table, so would changing one of the zeros on the left to 750 and finding an AIR_#/M value for it possibly make the car idle stable at 750 RPM?
