[Gmecm] $8D code "issue"?

[Scott Peitzsch]

I don't have a datalog, and have since corrected the cause.

I actually stumbled upon it by accident.  I had installed a remote
starter in the car with the '730 ECM/454 combo.  I was still working
on getting the cranking PW tables dialed in at all temps, and remote
started the car on a particularly cold night.  When I came out, it had
a notably high idle (around 1600RPM in my case) that would not
not come down until I shut off the car long enough for a full ECM
reset to occur.

I finally figured out that it had remote started, stumbled/stalled, and
restarted again without cycling the ignition power off - which is a normal
response for this remote starter upon detecting a stall.  I was able
to repeatably replicate the issue manually with the key on a cold start.

I've since fixed the Cranking PW so that startup is crisp and quick
under all temps and haven't seen the issue since.  Other than that,
setting up and tuning this 454 hasn't been much different than any
other '730/V8 application.

-Scott


 -------------- Original message ----------------------
From: "Brendan Patten" <bpatten at centurytel.net>
> I'd like to see a datalog and watch the commanded idle.  Does it try to
> start and sputter then die, or what is the chain of events?
> 
> I'm looking at doing a $8D big block 489 inch motor. 
> 
> thanks
> 
> -----Original Message-----
> From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On
> Behalf Of Scott Peitzsch
> Sent: Tuesday, September 26, 2006 3:15 PM
> To: gmecm at diy-efi.org
> Subject: Re: [Gmecm] $8D code "issue"?
> 
> > I'm happy driving my 1227727 converted 323i for the last month, but I
> > found the following issue:
> > When I crank the engine very short and the engine doesen't start, but
> > rotates, then if I try to restart it right away, the engine starts OK,
> but
> > the commanded IAC position stays sky-high and gets me a 2500RPM idle
> ....
> > and doesen't want to come down until I shut the engine off and restart
> > it again.
> > 
> > Is this some funny side-effect of my combination of non-standard
> values
> > I used to adapt this mask to my engine? (the engine is a I6 + DIS)
> 
> My '730 ECM running $8d to operate a 454 exhibits the exact same
> behavior.
> I suspect its an inherent feature/flaw in $8d.