[Gmecm] 7747 stumbling acceleration when cold

[Charles McDowell]

I can check in the log file tonight for the items you asked about.  I was
having major grief when I first installed this because I was given 305
injectors by mistake.  I examined every tiny detail of the install so I'm
pretty sure I don't have any air leaks.  Also bear in mind that it all works
fine when warm.  I know things expand when they warm up, but it sure can't
be anything major.  The thing idles and cruises fine when cold too.  It
really seems like an acceleration thing.

Does anyone know for sure what things need to be changed when using a larger
injector size?  All I changed was the BPW to account for "cop car"
injectors.  Are there other things too?

Thanks.

On Tue, Nov 30, 2010 at 9:19 AM, Aaron <aaron at creativeoverdrive.com> wrote:

> We have discussed the adapter plates before.
> They are notorious for creating a vacuum leak were the TB and IAC gasket go
> over one of the bolts.
> The IAC sometimes even hangs over the adapter plate, so there is no seal to
> the gasket.
>
> What is the IAC position at idle open loop and closed?
> Map voltage?
> TPS voltage?
> Fuel Pressure on the supply side?
> Fuel Pressure on the return side?
> Have you looked at the fuel spray pattern from the injectors?
>        I like using a dial back timing light to strobe the spray to see it
> more clearly.
>
> From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On
> Behalf
> Of Charles McDowell
> Sent: Monday, November 29, 2010 3:09 PM
> To: Eck, Joel
> Cc: gmecm at diy-efi.org
> Subject: Re: [Gmecm] 7747 stumbling acceleration when cold
>
> I'll double check my logs, but I think my temp is good.  Bear in mind that
> it's not like this thing ran well once and stopped.  It never worked well
> since I installed it.  I have an Edelbrock performer quadrajet carb
> manifold
> with an adapter for the TBI.  Thanks.
>
>
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>
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