I have a 94 turbo diesel w/ 50k. After driving other diesels seems like this thing takes forever to start. I check all the basics glow plugs, glow plug relay, air and feul filter. Truck has 2 new high amp batteries. Once running engine runs strong. Hooked up my scanner no codes. checked the running stream and the only thing I found out of range was the engine temp. I went ahead changed sensor. checked all the wiring etc. to the manual specs. still reads out of specs. 1)How many seconds after glow plugs are ready should this truck take to fire. 2)Could I have a bad computer that may be throwing off the fuel and air delivery at starting? any suggestions please advise.