Nlevine125
Registered User
1991 7.3 IDI non turbo. I’m just about out of ideas here. This has been an ongoing problem for quite some time now. Got a truck that will start and run just fine when the engine is cold, but will just sit there and crank without firing when hot. I know that this is a problem sometimes caused by a worn out injection pump. This is a 1 owner truck with 260k miles and was still on the original pump and injectors. As I’m doing a semi-restoration on the truck, I decided I might as well try and fix the no start issue while I was at it. I have replaced the following:
-Injection Pump, stock output purchased from Conestoga Diesel
-Injectors, aftermarket stock replacements from Accurate Diesel
-All injector return lines and cups
-Starter
-Both batteries
-Glow plug relay from Motorcraft
-All glow plugs (AC Delco I believe)
The truck runs great when it’s actually able to start. Way smoother than before, better throttle response and just nicer to drive in general. However, as soon as I shut it off, it will not start until the engine cools down completely, although at times it sounds like it wants to run. I’ve had issues in the past where the truck would suck air into the fuel system and cause the engine to die or not start. That issue has since been fixed and I am 100% certain there is no air in the system. Also, I have the mark on the injection pump lined up exactly with the line on the timing cover. I’m completely out of ideas as to what the problem can be. Any help would be greatly appreciated.
-Injection Pump, stock output purchased from Conestoga Diesel
-Injectors, aftermarket stock replacements from Accurate Diesel
-All injector return lines and cups
-Starter
-Both batteries
-Glow plug relay from Motorcraft
-All glow plugs (AC Delco I believe)
The truck runs great when it’s actually able to start. Way smoother than before, better throttle response and just nicer to drive in general. However, as soon as I shut it off, it will not start until the engine cools down completely, although at times it sounds like it wants to run. I’ve had issues in the past where the truck would suck air into the fuel system and cause the engine to die or not start. That issue has since been fixed and I am 100% certain there is no air in the system. Also, I have the mark on the injection pump lined up exactly with the line on the timing cover. I’m completely out of ideas as to what the problem can be. Any help would be greatly appreciated.