Runs fine

I have had a few long cranks no start waited a few mins after 3-4 tries and it started

 

It could be a Bad SGII Code

Does the Sync code your using now worked in the Past??? If so maybe theres a wire chaffe somewhere

If it didnt Acheive sync it wouldnt start Period untill it did sync

 

Just got the SG2

Ive had a few non starts long cranks this week havent figured why yet

 

If thats the case probably just a Bad code in the SGII

Whats ICP & IPR% look like

 

at idle ipr 20.x-22.x icp 635-645 temps ect and eot 190-192

Just towed the trailer today 40 foot gooseneck combined Truck and trailer wt 24.5K

Crusing 60mph i seen ect as high as 205 eot 213-215 at that coolant temp

The fan never runs faster than low 500's Rpms towing Outside temp low 60's At idle is 325-375 At 190 temps

 

Hpo system looks good no Leaks

With that said makes me wonder if this is an electrical problem being that its intermitened

You dont have the Hard/Long start everytime do you???

Your Fan seems ok per those temps but wouldnt hurt to check the Fan Clutch wireing at the fan shroud as a wire chaffe there will cause a NO START

Still Have the EGR Valve??

 

Still have the egr

Hart starts no not everytime most times crack the key fires right up.

 

I assume it runs fine

Intermttend problems suck might try wiggling engine wire harness next time it acts up and if Auto trans wiggle gear selector alittle to

 

Runs great and yes it sucks