Strangely none of the v6 Fieros came with a knock sensor, though apparently you can add one to the 1985 if you source a filter module and change a flag on the chip - you could just wire in a wideband...

Hello! Thanks for letting me join the forum! I've been working on cars for most of my life, but am new to EFI. My current project is a 1987 Fiero GT that I'm pretty sure just needs some tuning to...