Re: XF EFI idle
dude, with that sort of EFI. it will run rough at idle if it has an air leak. your engina has to be compleatly sealed. to find your INDUCTION leak, spray wd-40 over all gaskets on the induction side, if the idle changes, thats the location of your leak. they have an air flow meter, when it draws air thats not measured by the vane meter, (the black thing with wires that sits on top of the air filter) some cylinders run richer than others and an eratic idle is the result. your EC-4 has various running modes, you notice it more when its warm cause nominal run mode has engaged or the leak is heat related. first thing id check is your egr valve, it sits on your exhaust manifold and is bolted to your plenum. i have an 87 fairmont with the same ECU and have had that problem already. i have done various mods, a manual tranny with your set up rocks, i broke the 15 second barrier down the quater, not bad for an old girl, eh?