VE and BLM cell edges

[Bob Valentine]

I'm not totally sure of the answer either, but the Snap-on manual from a
MT2500 scanner say something to the effect of "The BLM cell value indicates
that the ECM is functioning properly in closed loop, adjusting the fuel
mixture".    It also said something about it being a 16-value table, which
I think is in the archvies somewhere too.

I'd interpret this to be that if the value is moving, you're in closed loop
and the ecm is using the BLM's to adjust things.     If this happens
(locked at 4) with a stock (or as near as stock), then something's really
wierd.   I'd expect to see a value of 4 when the ECM is in PE, or other
"closed but open" loop situations.   

Alternately, you've achieved the "perfect" tune, where both the BLM and INT
stay at 128, thus ECM needs not adjust anything....   

I'd go check on mine, but 4" snow prevents that. 

-> Bob Valentine
-> bob at tecmark.com

At 11:07 PM 1/18/2001 EST, you wrote:
>In a message dated 01/18/2001 9:30:03 PM Eastern Standard Time, 
>dzug at delanet.com writes:
>
><< I have the cause of cell 4 lock (if no one else got it).. on a retro car,
> you are not getting VSS to the ECM. It will lock in cell 4. >>
>Hmmm, not sure of that since I have had a VSS in my TPI for the whole
time. JW
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