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Engine will only idle with rich AFRs

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Old Nov 21, 2008 | 07:40 AM
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champLSinteg's Avatar
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Default Engine will only idle with rich AFRs

I though I would get better answers in here than in the FI forum. https://honda-tech.com/forums/forced-induction-16/engine-will-only-idle-rich-af-ratios-2433879/

It idles pretty smooth now but only with AFRs richer than 12.3:1 or so. If I add remove fuel the idle will start to bounce back and forth between 1200 and 900 rpm. I added timing as well up to 21* from 17* when I remove fuel and it makes no difference so I left it at 17*. Is this something I will have to live with or can it be fixed?
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Old Nov 21, 2008 | 07:48 AM
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Originally Posted by champLSinteg
I though I would get better answers in here than in the FI forum. https://honda-tech.com/forums/showthread.php?t=2433879

It idles pretty smooth now but only with AFRs richer than 12.3:1 or so. If I add remove fuel the idle will start to bounce back and forth between 1200 and 900 rpm. I added timing as well up to 21* from 17* when I remove fuel and it makes no difference so I left it at 17*. Is this something I will have to live with or can it be fixed?
what management are you using? what injectors? what battery offsets are you using?
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Old Nov 21, 2008 | 08:13 AM
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I am using S300 with 1000cc precision injectors. The battery offsets are what hondata has by default. I also changed the tables to match the numbers I got from this site... http://injector-rehab.com/kbse/lag.htm But it did not do anything.
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Old Nov 23, 2008 | 10:38 PM
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Originally Posted by champLSinteg
I am using S300 with 1000cc precision injectors. The battery offsets are what hondata has by default. I also changed the tables to match the numbers I got from this site... http://injector-rehab.com/kbse/lag.htm But it did not do anything.
pretty much in the same boat as you, hondata s300, same injectors, same deal with the idle.... grrrrrr
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Old Nov 26, 2008 | 07:44 PM
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The precision 1000's usually don't idle well any leaner than 13:1 or so at best, which is a result of the poor atomization. If you want to solve that problem, try a set of our 1000cc saturated injectors. The atomization is much better and they will idle smooth as stock at 15:1 a/f or leaner. The car will idle and run much smoother.
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Old Dec 1, 2008 | 02:28 AM
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Originally Posted by tony1
The precision 1000's usually don't idle well any leaner than 13:1 or so at best, which is a result of the poor atomization. If you want to solve that problem, try a set of our 1000cc saturated injectors. The atomization is much better and they will idle smooth as stock at 15:1 a/f or leaner. The car will idle and run much smoother.
highly recommended!
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Old Dec 1, 2008 | 05:35 PM
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Originally Posted by tony1
The precision 1000's usually don't idle well any leaner than 13:1 or so at best, which is a result of the poor atomization. If you want to solve that problem, try a set of our 1000cc saturated injectors. The atomization is much better and they will idle smooth as stock at 15:1 a/f or leaner. The car will idle and run much smoother.
Agreed.. The Precision ones are complete POS
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