Where is the quad driver located on a Saturn SL1?
The "quad driver" is built into the EMC/PCM (computer). Its NOT replaceable - the only way would be to replace the PCM. They are pretty hearty though - and I doubt you have a bad QDM. I would say the EGR solenoid would be a better choice of things that are bad. Eric
Trouble code 26 is a common GM fault. It means the Quad-Driver circuit has failed. the driver circuit is hardwired into the ECM and is not replaceable on its own. Before replacing the engine computer, follow all the ground points to make sure none of the grounds have failed. If all the wiring looks correct and good, then ECM replacement is necessasary
My son's 1999 Salvaged/total Saturn SL1 was rebuilt using many engine and body parts from 1995-1999 Saturn SL1 and SL2 cars, I believe it will work fine. I do not recommend before 1995 or 2000 or later models. I do not recommend SL2 either. I am not the expert but most of my son's engine is not 1999 SL1. Good luck!