It all started out like it was missing real bad and it got where it didn't want to start the only way I can get it to start is to plug the heater up. Can you give me any idea why it is causing this?

 

First thing to do so we can give any advice is to give us the year of the vehicle, any codes it may be giving, and any other info like that. This will help greatly. Welcome to FTE.

 

https://www.ford-trucks.com/forums/3...ch-folder.html

here is a link to the tech folder. It has tons of info for troubleshooting.

 

If it starts after being plugged in, check the FICM voltage. You can follow the following specification.

https://www.ford-trucks.com/forums/8...procedure.html

 

When I plug up my 2004 6.0 it will start right up and runs good do you think it is the FICM? thanks

 

Someone???

 

Not to me....sounds more like glow plug problem......

 

I'm with Bud on this, at least without knowing more. Get the truck code scanned. It will tell you if you're having glow plug issues. The block heater only warms the coolant and does nothing else as far as electrically aiding the truck. Do you get a long crank time and lots of smoke when it's not plugged in?

 

Turns over forever wont start and doesnt smoke but you can plug the heater up for a while and it will start up