Evo stalls w/ AC on only when depressing clutch on decel
Dec 6, 2014, 06:27 AM
#47
I would like to update this post with what completely fixed the problem for me. Like I said I was dealing with this problem when the car was on stock maf, tune, injectors etc, only mods were TBE and GSC S1 cams, and the problem existed even with a SD tune with a lot more mods. My fuel trims were spot on and the tune was also spot on. But yet, every time the AC was on it would either stall or almost stall when I would push the clutch in when coming to a stop. Also I would like to note that when the car was sitting in neutral the AC would kick on and off and it would idle perfect. My problem only existed when you pushed the clutch in after being in gear. It seemed to me that the ecu would let the RPM drop to low before turning on the injectors, causing it to almost stall.
I contacted Merlin.oz about the problem, sent him a small donation for his help and he fixed the issue for me. I do not know if he would like me to post what table he adjusted for me, but it was not included in Tephra's XML. Maybe he can chime in and if he has no problem I will post it up.
I contacted Merlin.oz about the problem, sent him a small donation for his help and he fixed the issue for me. I do not know if he would like me to post what table he adjusted for me, but it was not included in Tephra's XML. Maybe he can chime in and if he has no problem I will post it up.
Dec 6, 2014, 01:58 PM
#48
Newbie
iTrader: (2)
Join Date: Aug 2010
Location: Tucson, AZ
Posts: 25
Likes: 0
Received 0 Likes
on
0 Posts
I would like to update this post with what completely fixed the problem for me. Like I said I was dealing with this problem when the car was on stock maf, tune, injectors etc, only mods were TBE and GSC S1 cams, and the problem existed even with a SD tune with a lot more mods. My fuel trims were spot on and the tune was also spot on. But yet, every time the AC was on it would either stall or almost stall when I would push the clutch in when coming to a stop. Also I would like to note that when the car was sitting in neutral the AC would kick on and off and it would idle perfect. My problem only existed when you pushed the clutch in after being in gear. It seemed to me that the ecu would let the RPM drop to low before turning on the injectors, causing it to almost stall.
I contacted Merlin.oz about the problem, sent him a small donation for his help and he fixed the issue for me. I do not know if he would like me to post what table he adjusted for me, but it was not included in Tephra's XML. Maybe he can chime in and if he has no problem I will post it up.
I contacted Merlin.oz about the problem, sent him a small donation for his help and he fixed the issue for me. I do not know if he would like me to post what table he adjusted for me, but it was not included in Tephra's XML. Maybe he can chime in and if he has no problem I will post it up.
Dec 6, 2014, 06:59 PM
#49
Theres a couple of keys to success with this issue.
1) Making sure your logging ISCV Demand Trim when you setting your BISS.
2) Doing the timing trick I shared years ago ie higher timing below your desired idle.
3) RPM adder table
1) Making sure your logging ISCV Demand Trim when you setting your BISS.
2) Doing the timing trick I shared years ago ie higher timing below your desired idle.
3) RPM adder table
Last edited by Boosted Tuning; Dec 6, 2014 at 10:13 PM.
Dec 7, 2014, 12:51 AM
#51
Here are the changes. On the left are the stock 88591715 values, and on the right are the changed values.
And here are the definitions for 88591715 xml.
<table name="Decel Fuel Cut Resume RPM" category="Global Fuel Settings" address="30fe" type="2D" scaling="RPM8"> <table name="Engine Temp" address="6fde" type="X Axis" elements="8" scaling="Temp"/> </table>
<table name="Decel Fuel-Cut, Fuel-On RPM v Temp" category="Fuel-Cut Control" address="3030" type="2D" scaling="Rpm8000"> <table name="Coolant Temp" address="6fde" type="Y Axis" elements="8" scaling="TEMP"/> </table>
<table name="Sync Load Change Idle Compensation vs Time Below 1000 rpm" category="Sync Load Decel to Idle Comp" address="6b3e" type="2D" scaling="CF128"> <table name="ISCV Demand" address="8246" type="Y Axis" elements="21" scaling="ISCVSteps16"/> </table>
<table name="Sync Load Change Idle Compensation vs Coolant Temp" category="Sync Load Decel to Idle Comp" address="6b30" type="2D" scaling="CF128"> <table name="Coolant Temp" address="6fde" type="Y Axis" elements="8" scaling="TEMP"/> </table>
And here are the definitions for 88591715 xml.
<table name="Decel Fuel Cut Resume RPM" category="Global Fuel Settings" address="30fe" type="2D" scaling="RPM8"> <table name="Engine Temp" address="6fde" type="X Axis" elements="8" scaling="Temp"/> </table>
<table name="Decel Fuel-Cut, Fuel-On RPM v Temp" category="Fuel-Cut Control" address="3030" type="2D" scaling="Rpm8000"> <table name="Coolant Temp" address="6fde" type="Y Axis" elements="8" scaling="TEMP"/> </table>
<table name="Sync Load Change Idle Compensation vs Time Below 1000 rpm" category="Sync Load Decel to Idle Comp" address="6b3e" type="2D" scaling="CF128"> <table name="ISCV Demand" address="8246" type="Y Axis" elements="21" scaling="ISCVSteps16"/> </table>
<table name="Sync Load Change Idle Compensation vs Coolant Temp" category="Sync Load Decel to Idle Comp" address="6b30" type="2D" scaling="CF128"> <table name="Coolant Temp" address="6fde" type="Y Axis" elements="8" scaling="TEMP"/> </table>
Dec 7, 2014, 02:54 AM
#52
Evolved Member
rich, you have some xml errors there.
The "Decel Fuel Cut Resume RPM" category="Global Fuel Settings" address="30fe" is not correct.
the table at address 30FE is Fuel Intake Air Temp Compensation (and should not be altered).
see the xml script below -
<table name="Intake Air Temp Fuel Correction" address="30FE" category="Closed-Loop Control" type="2D" scaling="CF128">
<table name="Intake Air Temp" address="714A" type="Y Axis" elements="8" scaling="TEMP"/>
</table>
"Decel Fuel Cut Fuel Resume RPM" and "Decel Fuel-Cut Fuel-On RPM v Temp" are both valid descriptions for the table at address 3030.
The "Sync Load Change tables are correct as is. (after re-checking, D'oh)
And perhaps I should also point out that Richards problem was not the usual issue this thread is about, his car suddenly became possessed by some demon while driving on lift off.
Damdeast video I have ever seen. Fortunately the tables he posted exorcised said demon.
The "Decel Fuel Cut Resume RPM" category="Global Fuel Settings" address="30fe" is not correct.
the table at address 30FE is Fuel Intake Air Temp Compensation (and should not be altered).
see the xml script below -
<table name="Intake Air Temp Fuel Correction" address="30FE" category="Closed-Loop Control" type="2D" scaling="CF128">
<table name="Intake Air Temp" address="714A" type="Y Axis" elements="8" scaling="TEMP"/>
</table>
"Decel Fuel Cut Fuel Resume RPM" and "Decel Fuel-Cut Fuel-On RPM v Temp" are both valid descriptions for the table at address 3030.
The "Sync Load Change tables are correct as is. (after re-checking, D'oh)
And perhaps I should also point out that Richards problem was not the usual issue this thread is about, his car suddenly became possessed by some demon while driving on lift off.
Damdeast video I have ever seen. Fortunately the tables he posted exorcised said demon.
Last edited by merlin.oz; Dec 8, 2014 at 12:28 AM.
Aug 24, 2015, 02:07 PM
#55
Evolved Member
iTrader: (33)
Join Date: Jul 2002
Location: Raleigh, Transplanted from Toronto, Canada
Posts: 5,313
Likes: 0
Received 1 Like
on
1 Post
I added these to 88591517 and they are not expandable. I would love to fix AC. I have the exact same issue the OP has. AC works fine at idle and cruising but coming to a stop it does.
