Quick way to turn off Idle Speed Spark Timing control

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Quick way to turn off Idle Speed Spark Timing control

Postby Mudog715 » Sun Feb 07, 2010 12:20 pm

I'm sorting out a problem with rolling idle when the EEC-V spark modulation grossly overshoots and oscillates (ie going from 5°BTDC to 26° BTDC). When this is happening fuel and ISC DC stay relatively constant. When the spark is not oscillating the idle is rock-solid. There are bunch of things that control this in later EEC-V (including some of the torque modulation functions, including "reserve torque" for idle stabilization) and I don't have time right now to sort it all out. I'd like to just disable the part of the Idle strategy that relies on spark control. Is there a single scalar I can change that will essentially disable it for the time being?

FWIW, the CNAB1 strategy computer I'm using seems to be closely related to CDANx so whatever would accomplish this on CDANx would likely work for me. When I perused the CDAN2 strategy doc I didn't see a single switch that disabled the function but several scalars that might work...
-Mudog

1967 Kaiser-Jeep M-715 '5-Quarter' Army truck
521 stroker, 9.5:1, ported F3 heads 2.19/1.76, 278/284 Hyd Roller Cam, Banks headers, 2x62mm TB, 90LMAF, 60#Dekas
EEC-V (FOU1-CNAB1) mass-air/SFI/OBD2, integral EDIS w/ custom CKP & CID sensors, twEECer RT
E4OD heavily modified, 2200rpm stall triple lock billet
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Re: Quick way to turn off Idle Speed Spark Timing control

Postby POPSRACING » Wed Feb 10, 2010 3:56 pm

Set Idle Spark Gain to "0"

This is how fast you allow the spark to be modified to control idle speed by the PCM. Stock value of "1", a value of "1.1" - "2" is more agressive where as smaller value the "1.0" such as ".9" - "0" less aggressive to none.
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Re: Quick way to turn off Idle Speed Spark Timing control

Postby Mudog715 » Wed Feb 10, 2010 6:09 pm

Awesome, thank you!!!
-Mudog

1967 Kaiser-Jeep M-715 '5-Quarter' Army truck
521 stroker, 9.5:1, ported F3 heads 2.19/1.76, 278/284 Hyd Roller Cam, Banks headers, 2x62mm TB, 90LMAF, 60#Dekas
EEC-V (FOU1-CNAB1) mass-air/SFI/OBD2, integral EDIS w/ custom CKP & CID sensors, twEECer RT
E4OD heavily modified, 2200rpm stall triple lock billet
Mudog715
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Posts: 62
Joined: Sun Oct 08, 2006 1:48 am


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