My 2013 ranger 800 Efi after the temp hits 180 deg. Will bog an stall when I try an excellrate. I've checked fuel pressure it holds at 50lb the strainer is clean as well, I checked tps an the other two sensors on that wiring harness for cracks an chafes . It has no service codes on screen. When it's cold it seems to run fine but as soon as it hits 180 deg is when the trouble starts... HELP !!

 

Fuel pressure is a little on the high side. Should be around 39 psi or so. Don't know if that is a problem,but you might try removing the radiator cap,raising the machine on it's side and try to bleed off any trapped air pockets that could be causing the problem. Plus because of the long radiator hose runs on the Rangers,there should be a bleed screw at the thermostat housing also to purge any trapped air.With no codes showing kinda hard to track down something like this. Still could be a t-bap wiring harness problem or the ecu could just be going into limp mode. If all else fails having it hooked up to Digital Wrench may be the best solution.