6.7L no start. delete question.

[sneakypete]

Hello

 

I have a 2012 F250 6.7L come from a used car dealer. They bought it as a no start. Their technician worked on it for almost 3 months and gave up. It has an EGR delete and an exhaust delete. He installed mulitple aftermarket programmers. After that didn't do anything, he took a fuel sample and determined it was bad. sounds like he drained the tank and installed fresh diesel. after that he gave up. now i have it. i took a quick look at it. setting p2291 and a low pressure switch dtc, sorry dont have my notes here. cranking, it hits 10000 psi. i verified the low pressure switch operating properly. dtc's set instantly after cleared. i returned the pcm calibrations back to stock. those dtc's don't return. during cranking it sounded terrible. found oil over filled, got about 20-25 litres out of the crankcase... installed proper oil and new filter. batteries were also cooked. driver side battery sitting in a pool of acid. new batteries and now cranking rpm is appropriate. did a relative and found #6 cylinder at almost nothing. synch pid is 'yes' at all times. rpm present and no cmp fault. pressure is around 10000 psi and it tries to start but won't. couple of questions. i'm very fresh to 6.7's so i apologize for my ignorance. i also no nothing about aftermarket tuners. can having an egr delete and exhaust delete cause a no start? shouldnt it start regardless? obviously i have a compression issue on #6 and will be doing a compression test, but is there any pids i should be focusing on for this no start or is it the same as the previous engines.

 

once again sorry for my ignorance. not very much 6.7l experience.

 

thanks for reading