Originally Posted by
Chris620
My st170 is doing a simpler thing only when I pluged in to a diagnostic is cam up with cat ?should I trust the machine and replace the cat ? Or decay maybe lol or will it defo be fuel pump ? And wats imrc by the way sorry I'm a complete noob
inlet manifold runner control. the inlet manifold is a dual stage thingy. it has long and short runners and switches between both. google them and you will prob find better explanation than me