Hi guys, i have a 05 lly that im trying to diagnose and fix. It ran great up until about a 2 months ago.
It cranks over for about 6-8 seconds before it will fire even if i prime the fuel filter before hand. I replaced the whole unit with a brand new one, that shortened the crank time down from about 10 seconds plus.
Now when i drive the truck if i really baby it it will run smooth through all the gears, if i WOT or try to accelerate (say to pass a car) i get black smoke, no power and surging. Under heavy throttle i have to let off the accelerator to get the truck to shift.
I have not done a return rate bottle test yet but im sure i know the results, i will get that set up now and test it. I have run a few logs if anyone wants to see them.
Any other ideas would be greatly appreciated. The truck is totally stock w/ 200k miles
Thanks guys