Stalling with AC on issue

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May 2, 2010 | 04:42 PM

#46

gt420hp

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From: Pittsburgh & Herndon

Quote:

Originally Posted by hotredevo

Ok I changed the ISCV with AC on 10 steps across the entire temp range and turned the AC on drive rpm to 953. I posted two jpgs of the stock settings and modified settings so you can see if I did it right. The tables in the pictures reading from left to right, top to bottom. TOP ROW: Desired ISCV intial step position with AC on-Neutral, Desired Idle RPM-Neutral, Desired Idle RPM-Drive, Desired Idle RPM; BOTTOM ROW: Desired Idle RPM-AC, Idle Settings With AC. I am going for a test drive now to see if it is fixed.

When I had my Red EVO IX with this problem, I made the changes suggested in the thread above, and also manually adjusted the idle up to close to 1000 rpm. That fixed the problem for me about 80 percent of the time....

May 2, 2010 | 08:25 PM

#47

tnt1106

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Joined: May 2008

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From: Dallas, TX

Quote:

Originally Posted by JohnBradley

Bump idle timing, make the ISCV for AC on match AC off in both the drive and neutral maps, and verify that MIVEC is 0* advance at idle. With the Cossies I would set my idle timing about 10* as long as you dont start getting a P030x code maybe a little more. Set your idle settings a little higher as well. I have set them to 1000 before and got fairly decent idle out of the Cossies. My S1's lope with 0* advance (I wonder if they were misboxed S2's almost) where everyone else says that they dont even notice them. I have played around with it and its fine in all rpm ranges/driving conditions. When I get home from work I will post the sections that are pertinent to your problem.

do you set BISS properly prior or after these changes?

Idle timing: I have tried everything from stock settings to a solid block of 19's

seems least prone with 11* idle, then 14ish around A/C Idle cells. ( FP4r's)

Jun 24, 2010 | 09:42 PM

#48

Smoothgangsta

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From: United States

What was the consensus on this issue? What was finally modified to resolve it?

Jun 29, 2010 | 10:52 AM

#49

MarkS

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From: Vegas

I am looking at the same issue and would love to hear if anyone has figured this out yet

Jun 30, 2010 | 01:48 AM

#50

Lmodel

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Joined: Aug 2008

Posts: 64

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From: Singapore

Quote:

Originally Posted by MarkS

I am looking at the same issue and would love to hear if anyone has figured this out yet

Adjusting the BISS usually solved the problem most of the time. Do note that after changing the ISCV, remember to disconnect the battery to reset the ECU. Even after that, it takes awhile for the ECU to learn the new settings.

For those with cams, it is recommended to change your timing between 0 - 1500rpm between Load 0 - 50/60 to around *11 to *14.

Most important, it takes alot of time and patience to troubleshoot the problem. Anyway, that's my fix!

Jul 29, 2010 | 06:54 AM

#51

widge

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Joined: Mar 2010

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From: Australia

I had this exact issue in my E8 after installing cams and intake

I increased my Idle with AC ISCV steps to mid 50's increased my Idle with AC on and adjusted my BISS a little, problem is now solved it idles around 1000-950 with AC-On and the RPMS jump to about 1500-1600 when AC engages and comes back down