[Gmecm] 7747 High BLM at idle

[DV Fagan]

Charles,
One more thought.. Turn the ignition on and wait 30
seconds.  Turn it off.  The IAC valve should now be
closed.  Disconnect the IAC electrical plug and then
start it.  If you have to give it throttle to keep it
running, do it.  Check your BLM #.  The IAC may be
carboned up and stuck open, requiring more fuel for
good O2 values.
Dennis

--- DV Fagan <dvfagan at yahoo.com> wrote:

> Charles,
> I meant to splice in an old vacuum guage and view
> vacuum to see if the MAP might be lying to your ECM.
> Dennis
> 
> --- Charles McDowell <charles at taildragger.info>
> wrote:
> 
> > Man, I've checked over and over for leaks.  I
> think
> > I'm okay there.  I don't
> > have a number for vacuum off the top of my head,
> and
> > I didn't log all the
> > data last time.  I can see the last 13 raw data
> > samples from the MAP and I'm
> > around 45.  I'm not sure how to coonvert that to
> > inches or kpa or
> > whatever... based on my last converted values (235
> =
> > 97 kpa) it would come
> > out to about 19 kpa, but that seems really low. 
> The
> > offending VE cell is
> > 800rpm/30kpa.
> > 
> > -----Original Message-----
> > From: gmecm-bounces at diy-efi.org
> > [mailto:gmecm-bounces at diy-efi.org] On Behalf
> > Of DV Fagan
> > Sent: Friday, August 19, 2005 6:17 PM
> > To: gmecm at diy-efi.org
> > Subject: Re: [Gmecm] 7747 High BLM at idle
> > 
> > Charles,
> > What is the manifold vacuum at idle?  You might
> > check your vacuum lines.
> > 
> > --- Charles McDowell <charles at taildragger.info>
> > wrote:
> > 
> > > My truck has been running okay, but I finally
> > decided to get around to 
> > > gathering some more data to fine tune things.  I
> > hooked up winALDL and 
> > > drove around for a while.  As I drive around,
> all
> > the BLM table values 
> > > in winALDL show 124-133 or so - not bad really. 
> > The weird thing is 
> > > that when I pull in someplace, put it in park
> and
> > idle it, the idle 
> > > BLM cell (800/30 in winALDL) just climbs and
> > climbs up to almost 150.  
> > > That same cell shows something like 133 if I
> look
> > at it before 
> > > starting to idle.
> > > 
> > > Any ideas what this could be, or where to even
> > start looking?  It's a 
> > > 7747 for a SBC 350 with automatic, converted
> from
> > carb.
> > > 
> > > TIA
> > > 
> > > 
> > > _______________________________________________
> > > Gmecm mailing list
> > > Gmecm at diy-efi.org
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> > > 
> > 
> > 
> > 
> > 		
> >
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