Motor. 6 liter
Crew cab
2003
Mods
Brand new 58 volt ficm yesturday
Brand new icp sensor yesturday
New high pressure oil pump 2000 km ago
Egr delete 2000 km ago
Brand new ipr valve yesturday
Arp studs and gaskets 2000 km ago
New oil cooler 2000 km ago
New Ckp sensor yesturday
Sct live wire tuner with innovated tunes

Issue.
Most of the time when I go to start the truck it won't start. No smoke out I the exhaust just cranks and cranks. Doesn't matter if the engine is cool or hot same thing. When it does start it runs perfect and I can shut it off and start it right back up and then sometime if I try a third time it just cranks over and over. I have check for wire chaffing and nothing. New fuel filters. One thing that I did notice is when I go to crank it over the ground strap from the block to the passanger fire wall gets so hot it will actually melt my heater box. I have spent a lot o. This truck and out of ideas.i live in a remote community and the closest shop to me is 1600 km away. Before this happened a exhaust hanger broke as I drove for about 300 kn and then I started to notice at an idle it had a slight miss when I shut it off it barely started again.


Sorry i posted in the 7.3 section could someone delete

 

What's the status of your batteries and or alternator? A low battery set can make it hard to start. For that matter, what's the starter like?

 

Batteries are new and alternator month old. Turns over fast no issue there. When cranking the ground strap from the block to the passanger fire wall heats right up ad melts the heater box. It will start sometimes when it wants hot or cold

 

Something in that start sequence is creating a load that is melting your heater box. Does the cable get hot as soon as you crank, or after you have been cranking on it for awhile?

What codes, if any, is the SCT showing?

Also, look into the Sticky section about checking your FICM.

 

Check the main engine ground, it goes from pass side battery to the block right next to the AC compressor, bet it is bad and you are pulling current through the body, the cable on drivers side goes to the frame.
Next check the turbo to make sure it is free, if it is sticking it will not start, also check the butterfly valve under the intae elbo to make sure it is open as they are known to stick closed. Buy a 05 and up intake elbo and it will delete the butterfly valve and still hook up to the factory tube.