Originally Posted by
ANDY black s13
check ECU multi-pug is pressed fully home and is square to the ecu body/casing,if it's slightly on the pi$$ some contact pins won't be touching properly
if the bolt is tight that don't mean it's all ok,
ideally to be sure you need undo the bolt pull the plug off and check for any distorted/bent pins
if pins all check out good and straight then re-fit the plug and press it square on the ecu, then do the bolt up
easy to mess it up by loosely locating the bolt and drawing the plug on with the bolt
this is if ref to the Manual swap being done not so well/bodged
wouldn't hurt to check the clock multi-plugs and anything else that's been fiddled with just so your not overlooking a simple hamfisted mistake
having to wack the fuse box is a loose connection/bad earth issue, 20 year old wires ain't brilliant so adding a big fat engine earth and good battery
ground point with a fat earth to - can only help ensure it's earthed properly
try trace how the auto gearbox starter imob/reverse switch was by passed or deleted and check its not that causing the random power loss/return