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I'd start with the glow plug relay and the glow plugs.
The relay is the weak link in the system but if they have never been replaced the glow plugs may be bad also. A quick check for the relay is in the morning before you start the truck is to short the two large post on the relay for about 20 or so seconds and then try to start. Be ready for some sparks when you do it. I'd use a large pair of pliers to do it.
The first post in this thread tells you how to test them properly.
www.thedieselstop.com
The relay is the weak link in the system but if they have never been replaced the glow plugs may be bad also. A quick check for the relay is in the morning before you start the truck is to short the two large post on the relay for about 20 or so seconds and then try to start. Be ready for some sparks when you do it. I'd use a large pair of pliers to do it.
The first post in this thread tells you how to test them properly.
Hard/No Start? Check here first.
Thought I'd post this as a sticky thread now that cold weather is on us. How to check Glow Plug System To check the Glow Plug Relay (GPR) · Be sure the engine is cold, so that the PCM will tell the GPR to turn on. If the engine is hot, you won’t have as much time to check. (if oil temp is...
www.thedieselstop.com
