Compression Ignition Addict
Join Date: Feb 2008
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If the glow plugs and GPR are good it should have no problem starting at that temp. Are there any other driveability issues that it is having? It could be something with the under valve cover harness that isn't getting the power to the glow plugs? It could also be a fuel issue. Have you changed your fuel filter recently?
If your batteries are weak they could be having trouble when it gets cold out, and if they are not putting out enough the truck won't start. Also if they are weak cycling the glow plugs that many times isn't helping them out, plus you shouldn't need to at that temp. When you say cycling are you just waiting until the wait to start light goes off, or waiting the whole 2min or so until the GPR goes off? If you are only waiting for the wait to start light to go off they may not be getting hot enough. If you are waiting the whole 2min it may help to try starting it before they kick off, like at 1min or so, that way they are still on and warming when the fuel is being injected.
If you are using the whole bottle of power service your mix could be too strong, I know I accidentally did this once and the truck didn't like it.
I would think there is an issue with the glow plug system of some sort. There is a thread in the tech section that will help you test it all out, I'll try and find it. On the 02 you have an air heater, which some of the older trucks like mine don't have, and my fuel heater is unplugged (you could check to make sure yours is plugged in), and my block heater isn't working and with a good glow plug system it will still start below 0.
I just realized I rambled on forever so I hope some of this helps.
Early 99 Powerstroke
Crew Cab Short Bed Lariat 4x4
SCT Livewire w/ various custom tunes
AFE stage 2
Super 66 Turbo
4" straight pipe
Automatic trans: PI Converter, tugger kit
Leveling Kit w/ 35's