Join Date: Aug 2003
Location: Perth, Western Australia
Re: EL Futura Stalling Randomly
tfi modules do fail without warning - except an ef doesnt have a tfi module(nor a distributor), it has a dfi module which is located underneath the coil packs. the symptons u are describing definitely point to ignition related. if it were a fuel problem it wouldnt "as if key switched off" stall but lose power and then stop. u'r describing exactly what a tfi/dfi module/ignition pickup does when it fails.
i've found thru experience that what you're describing can only be a couple of things. one is the crank angle sensor. to test it, when the engine stalls, pour a shitload(watering can) of cold water over it(back of the harmonic balancer) and then see if it starts otherwise the dfi module - this is expensive even secondhand.
all of that is provided that when it stalls it is in fact spark that u have lost. hope that helps