I would say check the decel fuel settings on the AEM. Also, a setting/table under the idle settings may help too, as the issue can be cause by the IAC.

 

Thanks for the advice. I know is nothing mechanical. I have a new IAC. Still does it. Im no tuner so ill have to have someone check those tables.

 

I wasnt suggesting that you had a bad IAC. I was saying that the "hang" happens because the IAC is programmed to let air (sometimes too much air) by during decel.

 

When i can get up with a friend with a cable, I will. Thanks!

 

I still have the same throttle hang and it hasnt changed with any of my tunes I have had including changes to the mivec, timing, or afr. I cant find anything that helps it nor can I find any table that effect it at all. damn IXs

 

Do you have a cable and your ROM?

 

Consult merlin's guide. Keyword search throttle hang in the pdf. There are two things you can fix, the decel fuel cut delay, and the idle stepper table. I'd do the decel fuel cut delay first since that cured my throttle hang 100%. Its also very useful to improve driveability too.

 

You should not mess with the Idle stepper table. It will affect cold idle.

The two areas are decel fuel cut delay (like you said) tables and the RPM adder tables.

This is for ROM 88590015 (USDM EVO IX). Add these tables to your .xml file.

<table name="Decel Fuel Cut Delay #1" category="Global Fuel Settings" address="3d6e" type="2D" level="2" scaling="uint8">
<table name="Load" address="6fc6" type="X Axis" elements="7" scaling="Load"/>
</table>

<table name="Decel Fuel Cut Delay #2" category="Global Fuel Settings" address="3d82" type="2D" level="2" scaling="uint8">
<table name="Load" address="6fc6" type="X Axis" elements="7" scaling="Load"/>
</table>

<table name="ISCV Demand RPM Adder (Moderated by Baro, IATS) (FFFF6EA8) (sub_204B6) [sub_1EFC0]" category="Idle" address="672a" type="2D" level="2" scaling="ISCV_AX2_8">
<table name="RPM" address="802a" type="Y Axis" elements="10" scaling="RPM"/>
</table>

<table name="ISCV Demand RPM Adder [rpm > 4500, load > 170, speed > 12 mph] (sub_1EFC0)" category="Idle" address="65de" type="2D" level="2" scaling="ISCV_AX2_8">
<table name="RPM" address="7fb0" type="Y Axis" elements="10" scaling="RPM"/>
</table>

Now for the settings..

You will just zero(0) out both of the RPM adder tables.

For the decel fuel cut delay tables, you will use the values below..

 

Hey Jay, the 2 decel fuel cut delay tables you posted have the same addresses as 2 of the ISCV demand tables from MrFred's ISCV disasembly. Those tables however use TPS rather than load for the left side. Here's a pic of what they look like with your values:

 

Yes, the two decel fuel cut table are actually ISCV tables, per MrFred. But I just use these definitions and settings because I know they work and I know they are the OEM setting for getting rid of the throttle hang, as they are the settings from the 03-04 EVOs that have no throttle hang.

Btw, your pic didnt post.

 

Great, thanks guys I will load this stuff in and see what I can come up with within the next day or so. thanks again

 

Makes sense. When I get home tonight I'll check why the pic didn't upload.

 

Jay, when you get a chance, can you tweak mine? It still does it from time to time, and I dont think we ever actually tried on my ROM

 

Just send me a PM and let me know what ROM # your on. or email me the ROM your currently using.

 

Quite interesting, my 05' hangs when run hard and me no likey...lol Can this happen on a stock ECU? Im not sure if my car has had a previous tune but I think it has. I have a Tactrix on the way. I have alot to read and alot to learn.. and not enough time..lol