ECU problems (7730 cold solder?)

[Carlo Putter]

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Hi
One thing you can look at, is whether the injector driver stage of your =
ECU is not blown. Many silicon devices go short circuit on overcurrent, =
so maybe ????

Cheers and good luck
Carlo

-----Original Message-----
From:	tedscj at usa.net [SMTP:tedscj at usa.net]
Sent:	Monday, November 16, 1998 4:37 AM
To:	diy_efi at efi332.eng.ohio-state.edu
Subject:	ECU problems (7730 cold solder?)

Hi,
I just got finished adapting a GM EFI system to a different car.  I had =
just
gotten all the kinks worked out and had the car running well when... it =
just
died.
Specifically,  it is a 7730 computer and after a bunch of fiddling and
figureing on the side of the road (which I won't bore you with) I =
figured out
that the computer suddenly started telling the injectors to open and =
stay
open... no pulseing, just constantly spraying.  Even if the motor is not
running or turning over, the moment you turn on the ignition, the =
injectors
lock open and stay open, spraying fuel and drowning the engine.
The first thing I did was check for a short in the wiring harness, but =
found
none.
The question I have is:  Can anyone think of anything other than the ECU =
(or
harness, which I've already checked) that could be causing this?
And has anyone had this happen to them before? is this a common way for =
these
computers to go?  I noticed in the archives a reference to "cold solder =
7730
ECUs" being a problem.  Perhaps this is my problem.
I just wanted to check in with the knowledge base here before I lay out =
a
bunch of cash on a new one.
TIA,
Ted

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