I am buying an engine out of a 2007 silverado 2500hd classic with the 6.0 lq4. The truck is being parted out and someone bought the driver's side fender and moved the fuse box and now the engine will not start. This engine has started on the first try everytime I have tried it and now it will turn over but will not crank. I have checked the fuse box and everything seems to be there. Any ideas why the engine won't start ? I really need this engine but want to make sure it will still run when I buy it. Any help will be greatly appreciated. Thanks

 

Might have to do a "crank relearn" procedure. Pretty easy to do and won't cost anything to try.

 

Did you check to see if it is getting spark? check for ground wires that have been disconnected, make sure power is getting to the fuse box

 

If it already started every time you tried it, and you've already heard it run, what are you worried about??