165 $6E cold idle

[Romans, Mark]

>From what I have seen the 6E code doesn't even use MAT for any corrections
to timing, maybe fuel through.
The main cause of idle stability issues I have seen is spark variation in
the map.
If you record a cold start on diacom and look at the spark timing and where
it
is on the map (LV8 and RPM) if you set all the timing in that area at the
same
amount of advance it greatly stabilizes the idle. (In my experience)
Mark
----- Original Message -----
From: "Marteney, Steven J." <smarteney at xlvision.com>
To: <gmecm at diy-efi.org>
Sent: Monday, February 12, 2001 7:10 AM
Subject: 165 $6E cold idle


> Found my idle problem this weekend... cold weather.  The weather here
(East
> Coast FL) went cold for the first time since I started playing around with
> closed loop disabled.  Both my lean and rich chips ran like crap.  This
> weekend, both chips ran great.  The lean one's idle was a little rough,
but
> not that bad with the low end of the MAF Scalar table turned up a bit.
> Looks like I've got some cold weather idle tuning to do.  Any thoughts?
>
> Here's my thinking.  With the MAT sensor located under the plenum, it's
> coupling all the heat from the motor.  The MAT readings from a cold to a
> warm day only differ by about 6-10 degF, even though outside air temp is
30+
> degrees below normal.  Would relocating the sensor away from the motor
help?
> (Thought about mounting it to the air filter can, right fender well in TPI
> Firebird.)  Or, can the air really warm-up that quick when it enters the
> plenum?  In that case, is the problem the MAF sensor is giving an
erroneous
> reading from the cold air?
>
> Any suggestions are definitely welcomed!!!
> Steve
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