Proportioning valve

[Cbitz233]

Getting rid of the computer stuff. Noticed that the proportioning valve wire goes to the computer (black and yellow) on my 83. Does anyone know how this system works and how i can bypass it.

[Avanti83]

My guess is the wire is to actuate the brake light and probably works by providing a ground if the slider is moved if one chamber in the cylinder is low on fluid. The light is also an indicator of the parking brake not being fully released according to the manual. 

When you pull the harness for the ECM you will find it is almost a stand alone harness. I don't remember what I did for the wire on the prop valve but I don't recall it being part of the ECM harness. I could be wrong as it's been a number of years. I could check but the 83 is in storage currently.

I suspect that you are eliminating the ECM to get rid of the carb and dissy setup on the car. I replaced mine with a Holley FI setup and dissy and it runs well. Just remember you will need a different dissy if you replace the carb with a different one.

Other than pulling a big arse snake out of the car, the job was pretty straight forward IIRC.