Hondata

The other issue common with idle mixture is any very slight exhaust leak will give the o2 sensor a false reading.

Face palm on this one, Ill get it to a dyno to verify the lambda readings on the sensor. I cant hear and exhaust leaks but ill double check that aspect.

I used the Hondata wizard ...

I will try Hondata values tonite, I will be happy with whatever corrects the idle issue ^^

The idle afrs were pretty much spot on with whatever target lambda we set

my base is roughly 45psi, should I go with Hondata recommended settings or ID recommended? I think we used ID's references

http://injectordynamics.com/injectors/id1000/

Well I mean my Kpro4, its completely new from Hondata. The old and new Kpro4 exhibit same patterns on the idle. I will refer this post to my tuner.

He took the same route and said to check the ECU. New has to be fine.

Is 12.5/1 at idle too much? If I set it to that it is fine and no misfires

Yes, they are new. I also have an AEM infinity and it idles perfectly on it. Coils, plugs etc.. all new

Im pretty sure it is not the ECU, I have just recently purchased a NEW Kpro4 from a licensed vendor and it does the exact same thing.

Only when warm, once it gets up to temp 180f~ is when it starts.

Around 12.5 it will smooth out, is that not too rich for idle?

heres a data log

it gets perfect if I fatten it up to 12.5/1 but isnt that too rich? The data logs dont show any abnormalities and the slight idle misfire doesnt throw any cel.

2003 Honda S2000

- serial number of your K-Pro4
- 4.2.3.0
- ECU part number 37820 PRB A05
- KManager version 4.2.3
- Modifications: Comptech supercharger, ID1000 injectors, CT exhaust, Flexfuel,
- Science of Speed 2009
- a specific description of the problem:

Car seems to have a slight cough or choke at idle ...