HEI

[Donovan L. Dibble]

The HEI connections for a non-computer are reasonably straightforward.
The module has four pins (2 on each 'end').  Mine has two terminals
labelled 'W' and 'G' and connect to the pickup coil.  (The wires going to
the coil are Green and White.  Thanks GM!)  The other two go to the coil
and battery (Convienently labelled 'C' and 'B') and run up to the 
distributor
cap.  If you can get a service manual from a late 70's car, the information 
should be there.  I'm not sure if you can simply replace the module with a
non-computer type without changing the distributor since the connector
isn't the same.  If your module is the same as mine (and if I remember
correctly), there are 6 pins total.  The extra pins are for EST and Bypass
commands from the computer.  There is also a signal back to the ECM
to send it the pickup coil signals.  I'd think a complete distributor swap
would be easiest to do.

(Now a little background and personal info....)
Currently, I'm working on making my own ESC/ECM system for a
turbocharged '81 Trans Am.  My ESC box self destructed and, unfortunately,
GM doesn't make them anymore.  My first move was to replace the
distributor/carb with older non-computer units and get the car running.
(Can't live without T-tops in the summer!!)  Now I'm entertaining the idea 
of
constructing my own ESC/ TBI ECM with a PIC, 68HC11 and some hard work.
The nice thing is that a majority of the sensors are already present since
the car came with the CCC system.  I don't have to find many sensors, I 
just
have to find the time......

Don

In the event my information isn't completely correct on the HEI stuff, 
please
be gentle :)

richard vandervoort wrote:
>
> Does anyone have a wiring diagram for internal wiring for a standard 
vacuum and mechanical HEI.  I want to convert a 79 Caddy with an electronic 
spark retard (CA only) to eliminate this fried black box.  Thanks in 
advance.

Go to the library and look up most any V8 RWD GM car from the late 70s
or early 80s.  I can say from experience that '78 Monte Carlos have
vacuum/mechanical HEI with the internal coil.

- --steve

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- --
Steve Ravet
International Meta Systems
http://www.imes.com
steve at imes.com