long crank after injector install

[Nitro41]

i just finished putting in my stage 1's. I got it to fire and drove it around for 20 minutes. shut it off, and it had a long crank to turn back on.

today, I tried again, long crank, fired, and then shut it off and it had a long crank to start.


it used to fire right up with the old leaky oring injectors but with the new ones and new glowplugs it just doesnt wanna start. whats up with this? i pushed the GP wires back on good, and i can hear the GPR clicking under the hood.


also, i am watching the guages, and the truck will crank for 7-10 seconds, then i see oil pressure jump up to normal then it conitunes to crank bout 3-5 more seconds then fires. I checked oil level and it in the cross hatch area.

[baddkarmaracing]

it probably has some air in the fuel system and maybe in the hpo system

[Robsr]

Yeah, just need to purge the air from the high pressure oil system, ford info used to suggest spirited driving.......dont get a ticket, lol

[Matt P]

You definitely still just have air in the system just drive it some more and drive it harder, I normally drive 30 or so miles after doing injectors to get all the air out

[Nitro41]

okay thanks guys. this whole process has been really funky at this time of year LOL. i had to do the whole process outdoors, and shipping has been HORRIBLE due to christmas.

oh well. but the good news is, once its runnin, she runs like a damo champ

[greasyF250]

Keep us updated on whether this starting condition gets better. My 2000 has always been long to crank , 5-7 seconds before it will fire. Not as bad as yours but mine never got any better after the new injectors.

[Nitro41]

still has a long crank. it has redeveloped the issues it had before my injectors. rough rough rough idle, and low power. it pulses somthin fierce too. like it has low power then boom normal again, and I jet off, then it goes to low again in a second or less.

[greasyF250]

What is your fuel pressure ? I had the same issue about 6 weeks ago, fuel pump was only putting out 20 - 28 psi. Should be 30-60 psi , i replaced the pump and dropped the tank and found the screens on the intake partially clogged . I had been running biodiesel since August. The bio cleaned all the crud off the inside of the tank and partially obstructed the pickup.. So between the fuel pump and the screens , The truck runs great with no issues , I took the truck on a hunting trip to west Texas , 4200 miles total and did not have a lick of trouble.

[Nitro41]

our OBS trucks have a mechanical lift pump i believe.

[strokinford]

i just installed stage ones too. i probabally had 3 long starts but now it starts after about 1 or 2 seconds... i had a problem once where the o rings on the injectors we not holding a good enough seal and the motor was loosing its prime...resulting in long crank times. i replace the o rings and that fixed the problem.... what kind of boost are you getting after your stage 1 install??? im on a mild tune yet still got 31 lbs of boost.