[Diy_efi] Re: Hesitation

[John Smith1882]

I'll admit upfront that I don't have experience with GM ECUs, but I think 
its probable that something is wrong if the ECU gets too hot to 
touch(usually 130F+). The electronics are probably rated around 200-250F, 
but I doubt they should get even half that hot. If it runs low impedance TBI 
injectors, it should be using a current limiting method to keep things cool 
OR a resistor pack for the injectors so they don't draw too much current. I 
know many imports(non-U.S. cars) used the resistor method from factory.

Re the stumbling, how big was the engine in the Silverado compared to your 
302? I suppose it could be that the Chevy needed more acceleration/tip-in 
enrichment than the 302 and it's flooding when you floor it. Kinda like 
having an accelerator pump that is too big.

>Date: Tue, 27 Jun 2006 10:33:09 -0700 (PDT)
>From: Scott Scott <scott_o_matic at yahoo.com>
>Subject: [Diy_efi] Hesitation
>To: diy_efi at diy-efi.org
>Message-ID: <20060627173309.84314.qmail at web36604.mail.mud.yahoo.com>
>Content-Type: text/plain; charset=iso-8859-1
>
>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!