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You would need to check the glow plug timer circuit and the fuel supply. Diesel glow plugs can wear out. Make sure the "Ready light" is working and that you hear the timer cycling. Usually the lights will dim as the power goes to the glow plugs.
The glow plug wire can be checked with a Voltmeter inserted on a wire from the Relay timer. The glow plugs are tested when they are removed from the engine. If you get this far, you can use battery cables to test them. They can melt. Ask for more details about proper procedure.
Sounds like the timer is bad. Since you have power when warm, the power relay must be giving the timer juice. The way it is suppose to work is you wait until the glow plug light goes out and then try to start. In cold weather it should take longer for the glow plug light to go out.
There is no fuse. The glow plugs work on relays. If you are having trouble with the glow plug system then Haynes has an excellent manual for the Chevy 6.2. It is part # 10330, Haynes Techbook, Diesel Engine Repair Manual. It cost about $20.
When this problem occurred this usually means that one or more of the engine glow plugs is burnt out, the decrease in resistance sensed by the glow plug controller drops and this causes the timer to turn off to quickly, have the glow plugs tested and the glow plug controller replaced if needed.
I think the timer is under the sloinoid wich is under the airfilter. My timer went out so i just ran some wires from the sloinoid to a toggle switch in my truck and just warm em up like that, i just took the timer out of the equation
My vanette had exactly the same problem yesterday. The glow plugs have a timer and a relay. I think that if the light on the dash goes on and off as normal then its probably the relay not the timer. So I have replaced the relay (£50 nissan dealer only) which is located in the center console below the radio/heater controls. Until its really cold again tomorrow I wont know if its really cured it but I'm fairly certain that will be it.