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Idle O2 settings in 730

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Old May 31, 2009 | 08:15 AM
  #1  
84KYSS's Avatar
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From: Kentucky
Car: 84 Monte Carlo SS
Engine: 408
Transmission: 700-r4
Idle O2 settings in 730

Trying to get as smooth idle as I can. Right now it seems to fluctuate +/-75 RPM. So based on a thread on tuning idle for a cammed engine https://www.thirdgen.org/forums/diy-...ome-those.html I've adjusted the Loop Closed Param, Idle O2 Rich/Lean Slow Zero Lower, & Upper, and threadhold to lower values which helped the idle and reduced the rich smell. But also in that thread they reference a table which in SAUJP_V4 is Loop closed Param, Slow O2 R/L vs Map Lower, & Upper, and threshold. Do I need to adjust those tables for the map area I idle in (40-50 kpa) or these are for off idle areas? The reason I ask is that after adjusting the Idle O2 values my O2 mv at a warmed up idle will range from say 82mv to 750mv. I realize the O2 will swing rich to lean but I didn't think it would swing that much. My VE is a little rich in the area I idle because I have been trying to nail down the MAT compensation stuff.
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Old May 31, 2009 | 11:30 AM
  #2  
JP86SS's Avatar
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From: Browns Town
Car: 86 Monte SS (730,$8D,G3,AP,4K,S_V4)
Engine: 406 Hyd Roller 236/242
Transmission: 700R4 HomeBrew, 2.4K stall
Axle/Gears: 3:73 Posi, 7.5 Soon to break
Re: Idle O2 settings in 730

Try this too,
https://www.thirdgen.org/forums/diy-...k-advance.html
Could be a combination of the two will smooth it out. Not sure if you will be able to stabilize it closer than +/-50 RPM just because of resolution of the readings.
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Old May 31, 2009 | 09:10 PM
  #3  
84KYSS's Avatar
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Joined: Oct 2005
Posts: 130
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From: Kentucky
Car: 84 Monte Carlo SS
Engine: 408
Transmission: 700-r4
Re: Idle O2 settings in 730

Yep, that's a good suggestion. I've already 0'd out the idle comp tables. I've read probably just about every thread on the board pertaining to $8D and a majority of the posts in the stickies. My idle is not too bad it just I think I can get it a little better.

BTW, thanks for all your help and suggestions. Without members like you willing to help out I'd never have been able to swap my SS over to EFI.

Last edited by 84KYSS; May 31, 2009 at 09:16 PM.
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