Re: Idle Block Learn Cell ??

[rr <RRauscher@nni.com>]

(With the pulling of fuel not affecting your idle, double check that
you are changing the right area. All it takes is setting up the .ecu
file incorrectly, been-there, done-that).

As for the blm idle cell=4, it is sometimes difficult to understand why
gm does things. If I had to guess, it would have to do with drivability.
Maybe to prevent a drastic change in an area that is then used when
'coming' off idle. Maybe to prevent a rough idle from switching between
two cells. On the '747, certain conditions will prevent an int reset to
128 when the cell selection changes. Like whether the O2 is sensing a
rich condition, or the ecm is in decel enleanment.

How many other cells have you seen in use? Are all sixteen used, or
just a couple? AZTY 730 v6 bin only uses three cells, idle, cruise and
a decel cell. That's all I've ever seen used. Other bins use two cells,
throttle open, and throttle not open.

hth's

BobR.

Squash wrote:

> While doing some tuning this weekend, I decided to work on the idle.  It's been running
> 51kpa/800rpm with 4/108/100 cell/blm/int.  I went into the lower VE table (aujp) and around
> 800rpm/51kpa I pulled fuel out, which had no effect on my idle!  So I checked around the ANHT hac
> and there is a setting for which cell to use at idle.  It was set to 4, and I had assumed
> something else, so I was wrong there.  But 4 is *not* where 800/51 is located.
>
> Why would I want to use cell 4 for idle?
>
> Squash
>
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