I have built a MS3X for my 1995 using Brainecks guide. When installed it started up and ran using his base map, however there seems to be a serious misfire at idle and cruise.

i have verified base timing, calibrated all sensors, installed AEM UEGO, installed AIT, all the supporting chores/parts to prep for megasquirt.

I can get AFRs decent and idle doesnt droop too terribly, the engine just shakes like crazy. Whenever turning on the AC the shaking becomes worse, AFRs peg out at below 10 and nothing can bring them back up. At this point the car starts smoking. Ive tried open and closed loop idle as well.

when putting my hand in front of the tailpipe, you can feel the exhaust pulses are slower than they should be indicating misfire.

Ive checked my wires against his diagram multiple times and theyre all correct and seem to have a good connection and at this point im
stumped.

attached is my msq. It will probably just look like Brainecks 9495basemap, but just in case.


Any other ideas as to what could potentially be wrong?

thanks.

 

Problem solved. Turns out I mixed up the green/white wire and the light green/white wire. Everytime the ac was engaged, it would actually engage injector 4 with a pwm of 100% leaded for it to be full rich.