Its your glow plug relay... Go to NAPA and ask for a GPR-109... DO NOT ask for a Powerstroke glow plug relay, the price will go from 35 for the GPR-109 to 109 for the correct part number. Only differance is the mount is 180 differant, big frickin deal.

DO NOT spray starter fluid in any glow plug assisted diesel when the glow plugs are working, the only thing that has saved you at this point is the relay is dead. You can and will blow the heads right off the block!

 

Pretty easy to change, the relay?

Thanks guys

 

the relay is really easy to change it only takes a couple minutes.

 

Standing above the motor, looking down at it, the glow plug relay is just to the left of the fuel bowl...

You will have two relays there on your truck, the front one is for the intake air heater, and the back one is for the glow plugs.

Replace the back ones and your hard start will go away.

 

Installed the GPC-100 and the truck hesitated and then started-up with no spray. I let it run for a little while and then shut off. Tried to start-up again and it would not start up without the spray.

 

GPR-109...

I dont know what a GPC-100 is...

 

I'm sorry, GPR-109 is what I bought.

 

The temperature in which the truck sits in really should not affect start up. Glow plugs really come in to play at colder temperatures. The mileage on the truck is what really starts to tell me worn injectors. These injectors do not last forever and when they start to fail they produce hard cold start symptoms like you are describing. You are not losing fuel prime because it will start with ether, and i would assume oil pressure is good as well because of that.

 

Incorrect...

a 7.3 will not start without a glow plug system at temps around 40, it just will not start.

Worn injectors on a 7.3 PSD will not cause cold start issues, so long as you can build 400icp pressures the injectors will fire and if the motor is warm enough it will run.

What does fuel prime have to do with starting on ether? The truck will run with no fuel when you spray ether, it is replacing the fuel load...

 

first things first test the glow plug relay by using a test light on the terminal with the yellow wire and brown. make sure you have good connections with your test light.