Hey Guys,

I have a few questions about some idle issues I've had since I first got the car up and running.

First off, when the car is cold (morning and after work) the car stumbles and sometimes dies. Once it warms up, it idles smoothly where I've set it. I've used Evoscan and set my biss when the car was fully warmed up. Idles around 850ish.

Car has EGR fully removed. I'm guessing that has something to do with it. I've made the periphery changes outlined in the EGR-removal thread. Other than that, I've not touched any idle tables.

My next issue is idle with AC. My AC didn't consistently work last summer, so I didn't realize what an issue it was. Now, it's causing some problems. I have a 3 year old and I'd like to get it resolved. Car idles nicely at 850ish until I switch the AC on. Then it drops to about 650. It still idles, but not high enough to keep cold air pumping. Also, it occasionally dies when coming to a stop, or if I turn the wheel and the PS puts extra load on the car at low RPMs.

I'm sure there's an easy solution. I've ruled out any boost leaks. No issues there.

Thanks in advance!

Brady

 

Sounds like the BISS isnt out far enough or it needs more duty cycle cranked into the ISCV maps, specifically for AC.

 

I've adjusted the BISS in SAS mode and it seems to be pretty happy.

I'm assuming you're referring to the Desired ISCV initial step position with AC on-Neutral?

Values (I'm assuming stock)

-26 - 180
18 - 164
45 - 153
68 - 144
93 - 126
122 - 102
171 - 42
180 - 32

Can you suggest some changes, or should I just add a little at whatever engine temp I log and see how it does?

Desired Idle RPM with AC on is set to Drive - 648, also. I've changed it to 852, but it didn't make any difference. I put it back to stock values.

 

Do you have mrfreds update for iscv disassem? Most if not nearly all old idle tables were brought up to date and have better table descriptions. Certainly could increase the steps at which demand is called for when ac is on.

Basically all of the demand values sum up and the stepper table correlates demand to iscv position. It's not always steps but demand values in some of the older tables- check it out it will make more sense.

 

I'm trying to do something similar to fix my reoccuring p0505 code. Could you post a picture of where the BISS is located? I can't seem to find it.

 

Not that I know of. Link me if you don't mind, or I'll search when I get back to work.

 

AC on should be something like -

-26 - 180
18 - 164
45 - 153
68 - 144
93 - 126
122 - 102
171 - 70
180 - 60

 

BISS is on the throttle body on the firewall side if its still right side up on a stock intake manifold. It is a phillips head screw and requires a stubby screwdriver to adjust it.

 

Just a quick browse of the thread, but it doesn't look like there's support for 94170715.

 

The 0015 doesnt need any of the additional tables. I havent found a use for anything other than the base idle tables, and I have made some pretty rowdy cams idle with some really crappy throttle bodies. When those tables wont get it, I swap IAC to make sure it hasnt gotten baked by the EGR. DSM problems have followed the Evo.

 

I did come across some of the tables corrected for address in 9417 in that thread, but not much to help you here.

What does your timing map look like at idle RPMs 0-100 load?

 

I've been curious about my IAC. The screws are being stubborn. I'm planning to pull the TB and replace the seals and gasket. I'll try to get a new gasket and screws for the IAC and pull it pretty soon.

Thanks for the input.

I'll post up my timing map when I get a sec. Just don't be too hard on me. I was told there were some "retarded" thing going on there.

 

A quick note on the IAC gasket (seal). Those can be a pain to get boost sealed. A little bead of RTV around that seal will go a long way to sealing up any boost leak at the IAC.

 

Okay, so here's an odd one.

I'm running 92170715. I made some changes to the scaling on my Main Map WGDC to try to fine tune a couple areas. Well, I noticed that it make changes to my Warmup Enrighment Load vs. RPM. I opened the map, and sure enough, it seems that it changed the scaling. But, I found that My Warmup Enrichment Load Vs. RPM and my Warmup Ignition Retard tables are horribly horribly wrong.

Can anyone give me the proper definitions and addresses for these 2 tables?

Thanks!

Also, I guess it's sharing the address 6982 with Accel Enrichment. What can be done to remedy goofing up the other tables while rescaling my RPM points for WGDC control?

Brady