All glow plugs check good, glow plug relay is bad but can jump power across relay and still no start, icp jumps right up during cranking 1200 psi plus, if you plug in block heater for 4 hours engine starts and runs a little rough then clears up, customer says it has sat a while, fuel is red but good and good fuel pressure, fuel filter is clean, truck runs ok after it has started, puffs a little out of oil fill tube but i have seen alot worse without cold cranking issues, changed oil and filter still having cold cranking issues (and its not that cold hear, will not crank on a 50 degree day if it has not been plugged in, truck has 150000 miles on it