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Really depends, hard starts and multiple cranks to fire especially when cold. There's a few other things to check like always battery, and your glow plug relay if you have a 99-03 sd the relay is located on the motor in the valley or middle,by the fuel bowl, if you look there you'll see two relays look like a starter relay the one closer to the firewall is the gpr the left big stud should have constant power take a multimeter and see it for 20, and it should read 11-13 volts with the key off, then have someone turn the key but not start it to read the right big stud they should be close if not your gpr is bad and could be the cause of hard starts. Mine read 11.4 and 12.6. If that checks out I'd go ahead and replace glow plugs, there about 100 bucks for motorcraft don't use auto lutes they tend to break off in the cylinder. My truck has 175000 and they were toast. Should only take you three-four hours tops depending on motivation and if you run into any problems like I did.
Strokin' Away
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