I have a '91 SC2 (yup, first model year). 'tis been a great car but
>recently it stopped starting. It turns over - even tries to sputter but
>never any real ignition. The local knowledgeable folks (not Saturn
>specialists 'cause we're out here in the middle of nowhere) have scope'd
>it and have determined that the injectors are not being activated (a bad
>'X6' signal). They've tried replacing the crank-sensor, the ICM, and
>the computer (all used, all one at a time) and have considered the
>engine-temp sensor. At this point we are grasping at straws and open to
>suggestions for possible solutions to the 'x6' injector signal problem.
> At about 178000 miles the car has done remarkably well but I figure
>there are still a few more miles left.
>
Classic coolant temp sensor. Car won't start because the computer doesn't richen the mixture for cold start, but you will get the occasional sputter.