Q. - I am interested as well. Just to make sure but does this work with 3800 swaps?

A. -
It will work with OBD1 systems with the 12 pin connectors that have the data on pins E & M.

OBD 1 was used from about 85 to 95. Not all GM OBD1 vehicles with 12 pin connectors have the data on pins E & M. Some 94 & 95 OBD1 vehicles use a 16 pin connector. This cable will not work with 12 pin connectors that have the data on a pin that isn't E or M. This cable will not plug into the 16 pin connector.

Finally this cable will not work with OBD2 systems. So that means it will not work with anything 96 and newer.

Now specifically -

It will work with all Fiero V6 ECMs
It will work with 84-86 Fiero Duke ECMs
It will NOW work with 87-88 Duke ECMs
It will work with the 1227730 ECMs
It will work on 3400 TDC ECMs up till 95 (if the connector fits)
It will work on the 92 - 95 Cadillac 4.9 ECMs
It will work on 3800 Series 1 ECMs up to 95 (if the connector fits)

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It will not work on any Series 2 or 3 3800s because they are OBD2

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I also will sell this cable with the 16 pin connector on it that was used on some models from 94-95.
I also will sell this cable with just pins on the wires so you can plug them into any OBD1 connector.

[This message has been edited by phonedawgz (edited 06-16-2014).]