This happened to me about a year ago, and I found that the truck was not creating enough high pressure oil on start up. You have to use an Auto Engenuity or a Snap On type scanner to read all of the pressures and voltages. When encountering this problem, the easiest way to find your problem is using a scan tool.
#7.3 INJECTOR DRIVER MODULE FAILS WHEN WARM DRIVER#
So, the high pressure oil pump supplies the injectors with up to 3200 PSI of oil pressure which actuates the injector plunger, which then sprays fuel into the cylinders, but this is all electronically controlled by the Injector Driver Module. These trucks have an injection system that is called HEUI, which stands for Hydraulically Actuated, Electrically Controlled, unit injection. Could be an Injector Driver Module, Engine Control Module, ICP sensor, Injector Pressure Regulator and it also could be the entire High Pressure Oil Pump. This usually means you have a high pressure oil problem or electronic ignition problem. No white smoke means you are not getting any fuel in the cylinders. If the truck turns over, does not start and has no white smoke you have a whole different problem. If it is a glow plug issue, please refer to my previous posts to check your glow plug system operation. If you go out to your truck and it turns over and blows white smoke out the back it is most likely a glow plug issue. Many of the starting issues can be related to the glow plug system not functioning correctly. So, how do you go about diagnosing a no start problem with your 7.3 Powerstroke.
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