MadMsheen

iTrader: (4)

I'm hoping someone can help me with this.

Conditions:
lifting into neutral as when coming to a complete stop or cruising in neutral
IPWs and IDCs dropping to zero (at zero when the timing is pulled)
TPS going to idle (at idle when timing is pulled)
ECU transitions into open loop (in open loop when timing is pulled)

Problem:
My timing is pulled by 10* vs the value I have in the open loop tables.
RPMs drop to 800-900 prior to coming back up to 1000 where I have it set.

This doesn't happen when the ECU doesn't have time to go into decel fuel cut, like between shifts. Only when I'm going into idle, either cruise or a dead stop. Once the timing has been pulled the ECU transitions back into closed loop, and my timing values jump back up to normal.

I've attempted to correct the timing retard using the Decel Fuel Cut Ignition Timing Retard table, but it has no effect. The values I have in that table are RPM vs Timing. Initially, they were set to pull 10*. I've changed the timing retard to 0* from 2500-500 RPM and no effect.. I'm using the 96940011 ROM, Tephra v5.10.

When I changed my open loop timing values in the respective Load vs RPM cell, it seemed to have an effect and raised the timing value by 1* during the drop from 3* to 4*. I don't feel comfortable adjusting my timing values in the open loop table any higher to correct the problem, especially since my idle uses some of those cells.

Any ideas what could be causing my ECU to pull the 10* of timing when my IDCs/IPWs cut out?

Edit: I'd also like to add that when coasting while in gear this doesn't happen, even though my IDCs/IPWs are at zero; AFR is already at O2. But as soon as I put in the clutch the timing drops. No change in AFR just the timing.

Mattjin

Editted : Just saw you have the map

Post up the map that you have for decel cut retard.

MadMsheen

iTrader: (4)

Here's the maps. The one on the left are the stock values. The one on the right is the one on my car, but it doesn't seem to have any effect.



This is the xml definition:

<table name="Decel Fuel Cut Ignition Retard" category="Fuel" address="39a6" type="2D" level="2" scaling="Timing">
<table name="Engine Speed" address="5a22" type="Y Axis" elements="10" scaling="RPM"/>
</table>

MadMsheen

iTrader: (4)

I hope I'm understanding you right. Did you want my ROM?

Mattjin

Dont need the rom. You did the right thing, but through everything I have seen with my rom that map should have been the timing solution.

MadMsheen

iTrader: (4)

Unfortunately, it doesn't seem to be working for me.

Here is a log of the timing drops when I depress the clutch. (Please, ignore the very first section. That's a section that was rich in open loop idle on initial startup, which I was reviewing.)

decel ignition timing retard logs

There isn't timing retard on the very last section, since I was decelerating while in gear.

MadMsheen

iTrader: (4)

The table still isn't working for me.

These are the current addresses I have.

<table name="Decel Fuel Cut Ignition Retard" category="Timing" address="4312" type="2D" level="2" scaling="Timing">
<table name="Engine Speed" address="6576" type="X Axis" elements="10" scaling="RPM"/>
</table>

I'm on 96530006 ROM, now. Any ideas why it might not be working? I disabled FAAbit10 hoping that would stop the timing retard during fuel cut decel but no dice.

tnt1106

bump to this. I am having the same issue causing car to stall at times. on the 88590715 rom (maf). so far have tried everything i couldfind via search (iscv values, raising timing, 0'ing the above tables posted) , still have ths issue.

MadMsheen

iTrader: (4)

I don't have the stall anymore, but I'd still like for the timing to match up a little better. I used the ISCV adjustments to force the revs to linger a little longer from 2000-1000 RPM.

BTW: You should watch the load vs RPM when you clutch in. Drop the timing in that area, so the transition won't be so vast.

hediki12

wow i was just coming home to post this. my car goes lean after a stationary rev to about 1.5k rpm. it dips goes lean and then tries to recover .. some times it does sometimes it doesnt. im assuming it fuel because there an obvious fuel cut when the rpms fall back to idle.

MadMsheen

iTrader: (4)

When you lift and the car is in gear, there is decel fuel cut ignition retard. Your car will go lean, because IDCs will go to 0. During that time your car will go to O2 and pull 10* of timing. I want to reduce the timing being pull, because when you clutch in it'll jump right back to normal base timing, which can cause stall if the delta is too great.

I've since resolved the stalling, but the timing is still being pulled during decel fuel cut.

tnt1106

which table did you adjust iscv from 2000-1000 in this is exactly what i need. on my iscv i have no rpm axis, i would guess it more near the top of the table?

thanks!

MadMsheen

iTrader: (4)

There are a couple. But the one I found the most useful to bring revs down slowly is the ISCV Demand RPM Adder* (sub_1EFC0)