l2r99gst

iTrader: (2)

When you engage the SAS mode, adjust your BISS so your idle is 850.

That should bring down your ISC steps into range. At idle, warmed up, no AC, no lights/etc, ISC steps should be 2-25. With AC on, it should be 10-70 steps higher.

Also, as far as your intake...when did you install that? That can definitely factor into the equation. But we can fix that too. To do that, we can start with your fuel trims, both long and short.

But, start with the BISS and log ISC steps again. Keep in mind that the ISC steps may take a bit to adjust after the BISS adjustment. So, your idle might be high for a while.

adcgn45

iTrader: (14)

ok i got my idle steps with no ac to be 20 and they are still 60-64 with ac on. ive had the intake a long time.

Fast_Freddie

iTrader: (50)

Let it idle with the AC on for about 10 minutes, and also the ECU will have to relearn how to "catch" the idle with the AC on driving as well, so give it some time while driving around.

adcgn45

iTrader: (14)

ok ill go drive it around

adcgn45

iTrader: (14)

well it still falls almost completely on its face but doesnt stall, of course its a little cooler out now

l2r99gst

iTrader: (2)

OK, now we can start adjusting some of the ISCV demand tables. Make sure you have all of them defined in your XML first. Search for mrfreds ISCV Control thread. I'm too lazy to find it right now, but I posted all the tables for 9653. We can probably use a couple tables to resovle this or lessen the effect.

Also, just out of curiosity, what are your fuel trims (both long and short) during idle and cruise?

I'm probably going offline for the night, but get those tables defined and if you want to start messing with it tonight, look for the tables that are coolant and rpm based and add some demand in the areas where you are having issues.

There is also a demand table for idle recovery as well that you can adjust to help recover from the dip. But, ideally, you should be able to adjust so that dip doesn't happen with the other tables.

adcgn45

iTrader: (14)

i know my ltfts are -4 but im not sure about the stfts.
ill try and find those tables. thanks

adcgn45

iTrader: (14)

ok ive got every possible table in the world for the iac valve

charlie.tunah

iTrader: (7)

good info guys. when switching to the 9653 rom from another, should we be copying over the initial iscv step tables? 9694 has alot higher default numbers for drive compared to 9653, in my roms at least.

adcgn45

iTrader: (14)

You did notice that they aren't in units in 9653 right? So when you convert some of them they are the same

adcgn45

iTrader: (14)

What I'd really like to know is what table is so different in my stock 9694 rom that makes my car idle properly.

adcgn45

iTrader: (14)

ok check this out guys. im no evom guru but i did a log with my old rom and a log with 9653 v7 rom and there is one thing i noticed that i think may be important..
i logged idle position switch on both roms. and in my stock rom the value goes from 0 to 1 when ac is switched on. but on the v7 rom this value stays 0 whether you have the ac on or off. i think this is a very likely culprit in the car stalling when ac is on. maybe someone who knows a lot can chime in on this idea?

GregM

iTrader: (1)

I've started playing with this in the last few days, with SAS activated,my car just about stalled, so increased the idle via BISS. ISVC steps changed from about 22 to 14, but the idle still drops abit to much for comfort to me. Still playing

charlie.tunah

iTrader: (7)

l2r99gst,
can you describe the function of the important iscv demand tables? In the phenem rom Im trying out, Ive got several iscv demand tables. Basically wondering if its worth messing with some of that stuff to get my stalling issue worked out. I wish I had those tables defined for the 9694 rom, so I could compare.

Id also like to know whether the idle error or idle stability timing control tables are worth messing with.

l2r99gst

iTrader: (2)

This thread by mrfred explains it all.