Issue seems like a very uncommon issue, and I cannot find any answers. It started when Texas had it's first cold snap. Truck ran perfect, absolutely no problems at all. The morning was warm, above 60 degrees, started out as a nice day. Went to work after school, and it got below 40 degrees. I got in the truck at about 10:00pm to go home, and while I was driving, the water in fuel light and glow plug light came on at the same time. I had all electrical power, but when the lights came on, I lost engine power and it went down to about 625 RPMs where a normal idle where be. Keep in mind, I had my foot in the same position the WHOLE time it did this. It was about at 30% pedal position. Lights came on for about 5 seconds and then turned off. Back to normal driving. A couple miles down the road, it did it again. I thought nothing of it because it was late and I just wanted to get home. I should've pulled over. About another mile down, the truck died completely. No engine, no electricity to the gauges or radio, BUT I still had headlights. I was rolling down the highway at 65 mph with no power steering or power brakes on new 37's... That was fun pulling over. I got it parked, and got the truck restarted. Cranked good, no slow or hard start. At the time, I had a used Edge CTS2 Insight monitor. I checked battery, it read 12.6-12.9. FICM
read 48 volts. I thought, well maybe it's a bad monitor. So I cleared it all, and disconnected it. Ran all the way home no problems, so I thought hey, that fixed it. The next couple of days it was fine, BUT it was above 50-60 degrees. I cannot remember the amount of days between the next "cold" day, but the next "cold" day was in about the 50's. I had gotten in the truck, started it up, and let it run for a little bit to warm up. I drove the truck about a couple miles and the water in fuel light and the glow plug light came on again. This time, it was day time so I just ran it and I wanted to see what would happen again. Well, it did the same thing. Killed the whole truck while driving. Got it started back up, and it ran fine once again. Didn't do it again that day. Now, I've had this issue for about 2 months now, and I'm slowly learning what it does. When it is below 50-60 degrees outside, the truck will do this. It does it in the same spot everytime. I drive the same route to school everyday and it does this about 3.4 miles in. It's identical EVERYDAY ITS "COLD". I've learned that once it does this, I can pull over before it dies, and just restart the truck myself and it'll have no issues for the rest of the day whether it's 30 degrees or 70 degrees. I do this everyday, until today. Today it was about 50 degrees, and I was expecting the truck to do it's routine. Up to this point, I've had the batteries, alternator, and starter checked. All good. I've replaced the glow plugs, glow plug wiring harness, and the glow plug control module. I have a new crank sensor coming as well. Now today, was different. It went about another 2 miles until the water in fuel light and the glow plug light came on. I thought, "hm odd, it went a litter father today". I pulled over, turned the truck off, and tried to restart it. No crank. No gauges. No fuel pump. No starter. Nothing. The only thing that came on was the radio. I kept cycling the key trying to get something to happen. I got out, turned off the lights locked it, unlocked it, and tried, I tried with the lights on and off, tried it in neutral, nothing. Eventually, the gauges finally came back on, the fuel pump ran, and I thought wow okay that took a little longer than usual. Fired right up, no hard start, or slow start. Ran for about 10 seconds and then died. Cycled the key, and nothing once again. So I sat there for another 5 minutes cycling the key, getting out, waiting blah blah blah. Cycled it and it fired right up once again. This time, it idled for about 5 minutes and I decided to drive it to school. Drove fine, until I got to the parking lot and it died once again. This time, I had no issues with the power, just cycled the key once, and everything worked. I parked it and went to school for the day. Came back out about 5 hours later, and drove home. No issues. I'm completely lost with this thing. Now that's just one issue with it shutting off. This one isn't huge, but it's still something. I found when it's COLD outside, and the truck has been sitting for more than 8-10 hours, that it'll die AT IDLE when I first start it up when I turn on my FOG LIGHTS and my FOG LIGHTS ONLY. It'll kill the engine, but fire right back up AND turn on my FOG lights no problem. I have found that turning on the fog lights before I start the truck, prevents this problem of dying. I'm getting scared to drive it now because it is really a safety hazard and with how large it is, it's a realllllly big hazard. (Crew cab long bed on an 8.5 inch lift with 37's and not the greatest steering or brakes in the world). I've decided to park it for now until I find time to take it to a diesel shop. I've been searching around and I've really come up with nothing. I've seen ignition relay and PCM
come up the most, but I'm completely lost. It's like the truck KNOWS when it's "colder" outside, but it's not even cold!! Is it just that coincidental that it does it on colder days? I don't know!? Up to this point, I've replaced the new parts as I said above, checked the battery and alternator terminals, and they were all tight. I've checked the wiring harness, it was a little worn, but it's expected. No exposed wires or anything like that. MAIN POINTS: problems only occur when it is below 50-60 degrees and the truck has not ran in a MINIMUM of 8 hours. Once it shuts off AFTER the water in fuel light and glow plug light come on, those lights WILL NOT come on again until the next day. Any insight would be great. Im sorry for how long this is, but I wanted to provide as much info as possible. Please ask questions, I'm happy to answer, and I'll respond as quickly as I can. Thank you!!