[Gmecm] Cold start with 1228746

[Roger and Carol]

I'm using WINALDL with Windows Vista on my laptop. It works fine. Not sure 
about Windows 7.

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From: "Jared Ryan" <jryan at caminofx.org>
Sent: Tuesday, November 30, 2010 06:37 AM
To: "A list for discussing General Motors EFI" <gmecm at diy-efi.org>
Subject: Re: [Gmecm] Cold start with 1228746

>> Jared, it sounds like as the engine warms up it leans out too quickly and 
>> dies, or like you suggest the IAC is closing too quickly and killing the 
>> engine
>
> I'm thinking more the latter, since it doesn't really get a chance to warm 
> up.  When it's very cold outside, it runs for maybe 10-15 seconds before 
> dying.
>
> Occasionally, when it is warm (80 or higher), it will start and run 
> strong, then start to sag and almost die, and keep doing that for a while. 
> It sounds to me like it's hitting the stall saver routine.  Once it has 
> gone through a few cycles of almost dying, then revving very fast and 
> settling down, it runs fine.
>
>> As a matter of fact, the car runs quite remarkable given the relatively 
>> poor tune I am running.
>
> Same here.  Once warmed up a little bit, mine idles very well, does not 
> ping audibly, has more than enough power, and can break both rear tires 
> loose on any surface (PosiTrac rear axle).
>
>> I eliminated the AIR pump as well as the EGR valve
>
>
> Mine does have an EGR valve.  It is finally exempt from emissions 
> inspections in Texas, so it no longer really matters.  The AIR pump went 
> away when the engine was changed from the original 305 to the new 350; I 
> have an idler pulley in place of the AIR pump (serpentine belt system from 
> an '88-'92 Camaro/Firebird).
>
> I picked up a 1227747 ECM with a PROM that is supposed to be for a '91 
> C1500 with 5.7L L05 engine.  As I understand it, my block is basically an 
> L05 except for the camshaft and intake manifold (heads are the TBI 
> swirl-port heads).  I'm going to give it a try out of curiosity and see if 
> it behaves differently from the ANLU PROM with the 1228746.
>
>> Your car may perform well as-is, but once the ecm goes into closed loop 
>> it's going to alter the fuel curve to maintain the proper AFR and 
>> therefore you may not realize how far off your VE tables actually are.
>
> That's sure to be a major factor.  A serious impediment is that I have not 
> had a good laptop to do real logging with.  I don't currently possess a 
> Windows laptop.  I have had some luck with my old Mac iBook G4 running a 
> Windows emulator with Win98 in it, running WinALDL, with an ALDL cable 
> connected through a USB-to-RS-232 adapter... but as you can imagine it's 
> very slow and WinALDL in that configuration is prone to suddenly shutting 
> down.
>
> What I'm going to end up doing is getting a used or refurbished Eee PC or 
> similar and try to really do some logging.
>
> Something I have noticed while logging with WinALDL: I can drive for quite 
> a while, but very few of the cells in the BLM table are ever populated. 
> Is this a function of how slow the ALDL interface is?  What I'm really 
> asking is, just because I don't see a value in the BLM table in WinALDL, 
> does that mean the ECM has not updated it in its memory?
>
> Does anyone know if WinALDL works in Windows 7 with a USB-to-RS-232 
> adapter?  If not, is WinXP a safe bet? I use only OS X and Linux at home 
> and at work, so I am out of the loop with Windows software.
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