[Diy_efi] Hesitation

[Scott Scott]

So it looks like I need to do some chip reprogramming.
 Of course I dont have the tools for this, but it
sounds interesting.  Anyone near Sacramento that wants
to lend a hand?

I have an ALDL connection on this setup, but no check
engine light.  Any idea how I can wire a light bulb
onto this ECU to create my own?

Thanks


--- David Rowley <david_rowley2003 at yahoo.com> wrote:

> I've put a couple of GM TBI units with a 1227747 ECM
> on 3 different vehicles (only 1 was a Chevy).  Even
> though all three motors looked similar on paper,
> they all had different fuel and spark needs.  The GM
> TBI has 2 different "accelerator pump" tables.  One
> is for differential MAP and the other is for
> Differential Throttle Position (as read from the
> TPS).  You will need to change and test these 2
> tables to fix the hesitation problem.  The easiest
> way is to use software like Tunercat with a Pocket
> Programmer, or make friends with someone else who
> has these tools.
>    
>   Yes, the ECM gets hot.  Not to worry.
>    
>   Good Luck,
>    
>   
> 
> Scott Scott <scott_o_matic at yahoo.com> wrote:
>   I just put a TBI setup from a 1991 Silverado onto
> a
> 1969 Mustang with a 302 (2bbl). It runs well, idles
> smoothly, but I have a couple of issues. 
> 
> 1?It has some hesitation on acceleration. Not when I
> rev it in the garage, but when its in gear. Timing
> is
> currently set at 10 degrees BTDC (base timing), I?m
> thinking of adding a little more advance to it. Any
> other ideas? It actually stalls out sometimes when I
> try to make a fast getaway. 
> 
> 2?I put the ECU under the dash. I reached in and put
> my hand on the box after I had been driving a while,
> and it was VERY hot to the touch. I almost couldn?t
> hold on to it. Is this a normal operating condition
> of the GM ECU? 
> 
> Any tips are appreciated! 
> 
> 
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