Quote Originally Posted by RobertISaar View Post
depends on the application. most cars don't need it, the some that do tend to need a 10K resistor connected from the B pin to the A pin(or the ground on the converter) either temporarily or permanantly.

if you use a male OBD1 connector, then you could simply run a wire from the B pin to a rocker/toggle switch, then to a 10K resistor, then to the ground circuit. you can then hide all of it in a small project box from radioshack. i think i use the 3" X 2" X 1" versions.



depends. some applications go into "ALDL mode" and will change the idle speed and add up to 10* of spark advance.
This is for a '7427 PCM and I will probably omit the ALDL connector for a permanent install. So can I just de-pin the white/black wire that terminates at pin B from the PCM and pitch it?