Re: Idle richness with 7747.

[Shannen Durphey <shannen@grolen.com>]

I would use a closed loop calibration, and look at block learn numbers
to get a rough idea how far to go.  If you are rich from top to
bottom, cold to hot, you might adjust fuel pressure or injector
constant.  Open loop and closed loop should be close, as CL is OL with
feedback.
Shannen

Kevin Reynolds wrote:
> 
> OK, I've got the burner up and running and a boat load of chips, an eraser,
> and have been playing/tuning my F-Body crossfire 350 combo. The reason I say
> playing is because I haven't started serious tuning, more like poking it to
> see what it does as a way to get used to the different functions and they're
> effect. Thru all this I've noted that the idle richness is around the
> 800-850 range and straightens out when it hits closed loop. My last few
> chips have been based on a non closed loop bin, and now not only is the idle
> rich, but since it never goes closed loop it stays that way, and it is even
> there at steady cruise. When driving it my O2s change, but when cruising(say
> 2500rpm with 23-24inches vacuum) it goes back to the steady 800-850
> readings. I've tried changing the coolant -vs - AFR, the main fuel table
> etc.. with no luck.
> 
> What do I need to change/work-on to adjust my open loop idle fuel, and is my
> cruise problem caused by it going back into that open loop idle circuit due
> to the high vacuum and low throttle position used to maintain a stead speed?
> 
> FYI, I'm using Winbin and  the CATS engine software to do my bin changes.
> 
> Thanx,
> Kevin R
> 
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