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Message: [QUOTE="dsberman94, post: 1549767, member: 12667"] Because after a minute the GPCM turns off the glow plugs and your voltage comes back up. Battery when not running should be between 12.4 - 12.9, so you’re within range there, a little on the low side but in there. The significant drain might be one of the batteries being bad. Disconnect them from the truck and each other and let them sit overnight, if they aren’t close to the same voltage in the morning you know which one is bad. Check that with a meter on each battery. The low voltage while the GPCM is active might be draining it too far for the pcm/idm to be happy and fire the injectors. Could be fuel pressure related as well. The pump runs when you turn the key to run but will shut off in a few seconds. That wouldn’t cause a 1 minute delay on voltage though. Sorry Jake but not sure the oil used is the culprit this time unless icp and ipr duty are terrible but it seems to much like and electrical issue for oil to make sense. Again could be low icp but I believe he already ruled that out by unplugging it to default to whatever the number is that will allow the pcm to fire the injectors. I don’t remember the psi ATM, too many drinks in. Really that truck should start in 70 degrees with no glow plugs. 38 degrees on a healthy engine it should still hiccup. Might run like chit but it’ll at least catch on a cylinder or two. Going to do some out loud thinking here. Sorry if you e already tried some of these. I would start with checking each batteries after sitting overnight disconnected from the truck and isolated from each other. IPR issues, tin nut on the back could be loose. Coil could be going bad. I got away with just changing the coil on mine and it’s working great years later. Wires frayed or broken but again probably wouldn’t be solved with a minute of KOEO. Something sticky in the ipr could do it though and it needs the extra bit of juice to make it work. Icp sensor new from Ford or parts store? Ford is the go to for it if you get it from anywhere else it’s probably junk. Fuel bowl heater fuse piggy backs pcm power. Fuse could be blown but 1 minute wouldn’t solve that either. After checking the batteries, If it’s warm enough that you don’t have to let the glow plugs work, if there’s a way you can unplug the GPCM and try to start it immediately after turning the key on that could help also. I’m more familiar with a relay system than the module. Firc I believe glow plugs stay active even after the pcm turns the dash light off. I think it’s 60-90 seconds total. [/QUOTE]