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Unstable idle, car almost stalling at low speeds, need help

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Old Dec 18, 2008, 02:46 PM
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Log and graph:

O2 Feedback Trim
Airflow Hz
O2 Sensor
ISCV Steps

Attach the log to if you can ...
Old Dec 19, 2008, 09:25 AM
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Also, please post your Idle Stepper Map from ECUFlash. I'm not at my machine and can't give suggestions until I get home unless you post your map. =)
Old Dec 19, 2008, 10:21 AM
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very good thread.. i might need to check some things on my car now lol
Old Dec 19, 2008, 06:35 PM
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Originally Posted by TouringBubble
Log and graph:

O2 Feedback Trim
Airflow Hz
O2 Sensor
ISCV Steps

Attach the log to if you can ...
Ok, here it goes:




Last edited by tboboy; Dec 19, 2008 at 06:37 PM.
Old Dec 19, 2008, 06:49 PM
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Attached Files
Old Dec 19, 2008, 09:54 PM
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Bump up the desired ISCV values in the warm areas and see if it helps ... move it up by about 3 in the lower 2 cells.
Old Dec 20, 2008, 09:49 AM
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I increased it by 3 in the 2 lower cells four right rows. Is that right?



Originally Posted by TouringBubble
Bump up the desired ISCV values in the warm areas and see if it helps ... move it up by about 3 in the lower 2 cells.
Old Dec 20, 2008, 10:15 AM
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Not the stepper lookup table, the desired ISCV tables for neutral and AC on. The simple 2-d tables.
Old Dec 20, 2008, 10:37 AM
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If I increase it by 1 increment it increases by 47. So do u want me to do 3 increments? It will go from 508 to 648.Or is there a way to increase by 1? Sorry for maybe dumb questions. My first time modifying the rom. Thanks


Last edited by tboboy; Dec 20, 2008 at 10:43 AM.
Old Dec 20, 2008, 04:33 PM
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I've loaded this map and it didn't help at all. Any other suggestions guys?
Thx
Old Dec 21, 2008, 01:04 AM
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Originally Posted by tboboy
I've loaded this map and it didn't help at all. Any other suggestions guys?
Thx
I had a AFR swinging issue when i had a metal intake on my car with injectors and cams. Solution was just simply to put the stock intake back on the car .

Maybe later a speed density setup will stop the issues i had with the small lope in the idle from effecting the MAF sensor.
Old Dec 22, 2008, 01:25 AM
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bump
Old Dec 26, 2008, 03:44 PM
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These are the modified graphs. It didn't resolve the issue.
Old Dec 29, 2008, 12:38 PM
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Alright, try setting the ISCV values back to stock and adjust this map ...



Adjust the entire row, starting at the top, to these values ...

0
16
28
36
45
51

I've found the Y axis to reflect airflow HZ values ... this should reduce stepper swings while idling.
Old Jan 2, 2009, 09:47 PM
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Originally Posted by RoadSpike
I had a AFR swinging issue when i had a metal intake on my car with injectors and cams. Solution was just simply to put the stock intake back on the car .

Maybe later a speed density setup will stop the issues i had with the small lope in the idle from effecting the MAF sensor.
My AFR also jumps to 20 and above when RPM dip happens.

I will try adjusting Idle Stepper look up table.


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