My '95 PSD has some slow start issues. About a year ago, I changed out all the glow plugs and it helped some, but I still have to keep the engine heater plugged up at night to ensure a quick start the next day, or I can expect to sit for fifteen minutes cycling the WTS light before I get a start. When I changed glow plugs, I had one that I never could get out because of carbon build up, so it was left as is and I went with 7 new ones instead of 8. I pulled codes today and the only thing I got was P1111 Pass Code. Nothing else, so I'm not sure why I'm still having such a slow start issue with this truck. I have a '04 6.0L and it starts fine on the same mornings the 7.3 gives me trouble.