Mine was doing this exact (wouldnt start at 40 deg unless charger was on it) (batteries tested good) same thing a month ago. Last week it began hard starting (in 60 deg weather), then finally wouldn't start at all (unless ether was used). Bottom line was $3600.00 at Cummins (yep new injectors). Runs great starts when cold every time. I have 310,000 miles and have tried everything to rule out spending that much (but time in $$$$$)i am having a hard time starting my truck when its cold out anything under 40 degrees but if i plug it in for 3or 4 hours it will start no problem. is this injectors or what?
What should normal Rail pressure be at all of these? I suspect I may have a leaky injector and I have a rail pressure gauge.rail pressure at:
hot 2000 rpm cruise control on flat freeway
classic signs of leaking injectors.
may as well plan on 6 new stainless steel, best ROI for your money
grid heater has no effect on start times until below 0d F. just shortens battery life and connections