[Gmecm] 7747 High BLM at idle

[charles at taildragger.info]

Yeah, I'm able to see exactly which cell I'm in using the winALDL program.
 When I'm in gear, it's in a different cell, and things seem normal.  When
I go to park, it switches to another cell and the BLMs in that cell go way
up.  I'm not just looking at a BLM stream, I'm looking at a table of
recent or averaged BLM values as a function of VE table cell.

I could just try to tune it out with the VE table, but I find it hard to
believe that the table is nearly perfect everyplace except one cell which
is way, way off.  Has anyone on the list had such a thing; where the
factory table was almost perfect except for one or two cells?

Thanks for the help.

> You need to look at RPM and MAP both at idle in neutral and in gear.  Your
> VE map is ok when you
> are in gear, but when you put it into neutral or park, the vacume goes up
> and the point on your ve map where
> it's idling in neutral or park is too high (The ve) reduce that part of
> the
> map until your BL comes back down
> to 128.
> Mark
> ----- Original Message -----
> From: "Charles McDowell" <charles at taildragger.info>
> To: <gmecm at diy-efi.org>
> Sent: Thursday, August 18, 2005 7:49 PM
> Subject: [Gmecm] 7747 High BLM at idle
>
>
>> 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
>>
>>
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>
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