Even with the new battery the wagon still occasionally wanted to stall in neutral and/or run rough at lower RPMs. Internet research at SaturnFans points to a faulty EGR valve. I still haven’t figured out how to read Service Engine Soon light flashes from the OBD computer, but I guessed it is probably throwing an EGR code.
So, I take the electric EGR valve off and give it a decent cleaning with some throttle body cleaner. The EGR valve gasket is a mess, but I put it all back together and hope for the best. I take my wife for a spin around the farmland in Sparta and everything seems to be fine.
The next day I drive the wagon to work and it starts to stumble as I pull off the expressway. It seems like merely revving the engine a little higher keeps it from stalling and the stumble even goes away without restarting the engine.
Since I also need a replacement taillight for the SC2, I head out to the LKQ in Wayland in search of Saturn parts. I pull an EGR from a second generation SL2. I also keep the gasket that is in good shape. I find both a front and rear lens assemblies for the SC2. The junkyard has a sale on seats, so I get an identical SC2 drivers seat to use for making a driving simulator cockpit—at least it was cheap. I also pull the rear speaker grills and parking brake button out of that car to replace those missing items from my coupe.
After bolting on the new rear lens assembly on the SC2, I clean up the junkyard EGR valve and install it on the wagon’s engine. The SW2 now runs without any issues. Soon I might have time to finish taking care of the rest of its body rust.