[Diy_efi] EPROM damage?

[Brendan Patten]

Check your powers and grounds to the ecm.  Check the 5v reference and
grounds at your map sensor, tps, etc, make sure they are all getting
grounded.  U said you got no codes out of it.  Do u have a service
engine light hooked up? If so..make sure it is working...should come on
when the key is on, but engine not running, and go out a few seconds
after starting.

I just recently put a 4.3 tbi in a 81 chevy pickup, had it running in
just a few hours after dropping it under the hood.

If you need a schematic of the pcm, let me know, I work at  a Chevrolet
dealership and can get all that stuff should you need it.


Later,


Brendan Patten

-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]
On Behalf Of David Daniel
Sent: Friday, April 09, 2004 10:26 PM
To: diy_efi at diy-efi.org
Subject: [Diy_efi] EPROM damage?

Hello,
I'm new to this list...
My current project involves transplanting a TBI 4.3 V-6 from a '85 Monte
Carlo (1226868 ECM w/FYW broadcast code) into a '81 Malibu wagon.  The
engine ran great in the Monte, but I'm having some problems in the
Malibu.
To start with, I seperated the entire ECM harness from the Monte and
swapped
it over into the Malibu.  The engine starts fine, but the CEL stays lit,
and
I'm not getting a "pump shot" when I blip the throttle, so the engine
bogs
pretty bad.  I can move the TPS lever and nothing happens.  Also, when I
jumped the ALDL to pull the codes there are none set.  I swapped in a
#1228746 / AUML ECM from a '90 Caprice after checking the pin-outs just
to
see if my original ECM was bad.  The engine ran, but not very well.
With
the  8746 ECM in place the CEL light went out, and I got a "pump shot"
when
I move the TPS lever, so I figured my ECM was bad.  I replaced it with a
re-man unit from Autozone, and I'm getting the EXACT same symptoms.  I
did
have a battery charger hooked to the battery while I was checking some
of
the power connections to the original ECM.  Is it possible that I may
have
fried the EPROM (I had to re-use my original EPROM in the replacement
ECM)?
Any help would be greatly appreciated.

Dave
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