The other day while driving the grey coupe, the check engine light came on, but with no driveability issues really. Since I already had the Scangauge plugged in I pulled the code on the spot and it came out as a P0401 - Exhaust Gas Recirculation Flow Insufficient Detected. It's a common code on these and basically amounts to an EGR valve full of tar and soot, preventing the valve from moving through it's range properly. The proper fix is to remove the valve completely and clean everything, then re-install. This is pretty intense work and requires draining the coolant and unscrewing some often very rusty exhaust flange bolts that could snap off. I have bigger plans for this thing so I opted to do a halfway step for now to clear the code and keep the car humping along until I can modify it properly.
Pop your hood and you'll see the EGR valve on the left hand side near the air filter box and intercooler. Unplug it from the harness by squeezing the sides of the plug and popping it off. You can then undo the 3 bolts holding the solenoid on, which are 4mm allen keys. I also clipped the zip tie holding the harness to the solenoid to move it out of the way. The allen key on the backside was quite hard to get at, and I ended up using a ratchet and flex joint to have the right length on the tool to get at the bolt properly. Now you can pop the solenoid off the valve housing. You'll notice how there is some soot buildup here.