Closed Loop Disable in $6E

[Bruce Plecan]

They drive the cars in alllll kinds of extreme conditions trying to get them
to misbehave.  Poor plugs lousy gas, plugged filters, they use the most
forgiving yet emission legal cal they can.   The poor maintance part is not
an issue here.  Less then single digits are very rare.  Which brings up
*choke* speeds.  The highest commanded idle I have is like 900 rpm., Why
have the engine spin at 1200 the first thing when it wakes up.  then just to
make sure I reduce the max IAC opening (Park).
Bruce





> Good question.. why wait to go into closed loop?  Why does the factory do
> it?  Maybe to give you "choke" fuel enrichment for smooth startup?
>
> I take it you haven't had any objectionable cold-starting problems with
> the low C/L enable?
>
> On Tue, 30 Jan 2001, Bruce Plecan wrote:
>
> >
> > ??
> > Closed loop enable of 107dC ??
> > That's higher then normal operating temp..
> >
> > FWIW, I usually use lower then stock enable temps when I'm done.
> > Why waste the gas, when you have the cal right, no need to wait around.
> > My TCC enable is like 50dF, and
> > C/L is about 90dF, I think
> >
> > Bruce
> >
> >
> >
> > > Simply out of curiousity (I'm going to burn a chip and try it for the
> > > halibut) the value at $445 in $6E is $6B.  If I use Craig Moates'
Qbasic
> > > code for 165 ALDL comm it equated to 104.45 deg (assume F) using the
> > > following formula:
> > >
> > > degF = (HEX_VALUE * .75 - 40) * 1.8 + 32
> > >
> > > If I assume it simply correlates to direct temp then it is either
107degF
> > or
> > > 107degC.  Any idea which way is right?  Just curious mind you.
> > >
> > > Thanks for the help!!!  I got discouraged when I thought I might not
be
> > able
> > > to tune this car in open loop to see if I could get the mileage up
before
> > > taking other more drastic measures.
> > >
> > > Steve
> > >
> > > -----Original Message-----
> > > From: Bruce Plecan [mailto:nacelp at bright.net]
> > > Sent: Tuesday, January 30, 2001 12:45 PM
> > > To: gmecm at diy-efi.org
> > > Subject: Re: Closed Loop Disable in $6E
> > >
> > >
> > >
> > > Take say Hexshop,
> > > go to 0445
> > > set to FE
> > > correct check sum
> > > Drive car.
> > >
> > > My *way*
> > > also disable, codes  13-44-45
> > > I have seen a few 747s get confused by not diabling the diagnostice
flags,
> > > so rather then risk messin around, I just do it all at once.
> > > Cheers
> > > Bruce
> >
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