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Rich open loop idle

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Old Sep 16, 2019 | 03:28 PM
  #1  
IROCThe5.7L's Avatar
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Car: 1988 IROC-Z
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Rich open loop idle

Hey guys,

My car is tuned in closed loop. 6E. I always had a rich open and closed loop idle. I realized I wasn't being aggressive enough with my MAF table changes. I now have a high 14's AFR closed loop idle. But the car still runs rich in the open loop cold idle. I zero'ed out the "Open loop AFR Ratio % change vs coolant temp". It made a difference. But my cold open loop idle is still mid to low 13's.

I'm not quite sure what other table I just look at the lean up the open loop idle?

Thanks!
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Old Sep 17, 2019 | 06:49 AM
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Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
Re: Rich open loop idle

Is there a open loop enrichment vs lv8?

also the open loop vs coolant should accept negative values

mid 13’s with cold coolant is fine imo
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Old Sep 17, 2019 | 08:39 AM
  #3  
IROCThe5.7L's Avatar
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Car: 1988 IROC-Z
Engine: 427 SBC
Transmission: ProBuilt 700R4
Axle/Gears: Moser 12 Bolt / 3.73 TrueTrac
Re: Rich open loop idle

Originally Posted by Orr89RocZ
Is there a open loop enrichment vs lv8?

also the open loop vs coolant should accept negative values

mid 13’s with cold coolant is fine imo
Thanks for the reply! I figure mid 13’s were ok too. But it puffs a very small amount of black smoke at cold idle. I don’t know if it’s because my Wideband is a little off due to the large cam or what.
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Old Sep 17, 2019 | 09:41 AM
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Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
Re: Rich open loop idle

Could be. How the plugs look
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Old Sep 18, 2019 | 03:54 PM
  #5  
IROCThe5.7L's Avatar
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From: Buffalo, NY
Car: 1988 IROC-Z
Engine: 427 SBC
Transmission: ProBuilt 700R4
Axle/Gears: Moser 12 Bolt / 3.73 TrueTrac
Re: Rich open loop idle

Originally Posted by Orr89RocZ
Could be. How the plugs look

Rich. But that was before I dialed in my closed loop idle which was always rich. That's a good idea. I'll pull a plug this weekend.
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