ok so im a cummins guy so bear with me. its a 99 or 2000 f250 with a 7.3 powerstroke. got some hpop leaks, but only 90k miles. you crank it up it runs fine take off down the road and within a mile your losing power. within 3 miles its shutting down and wont restart. has a long crank time and runs like its getting air in system or at least it runs like a cummins thats sucking air. gimme some guidance o' strokin gurus thanks ask any questions and ill do my best to answer

 

Any HPO leaks will cause issues. Could be a IPR, or a leaking injector o ring... Do you have access to any scanner tools?

 

yea heading home to check codes but i dont even know if engine light is on. ill give more info in a little while

 

Codes might help, but you need to have a scanner that can read the duty cycle of the HPO pump and the ICP pressures. A Buzz test would help as well.

 

ok so i hooked up my universal scan tool no codes. went to start and it spins over and it kinda hits on what sounds like a couple of weak cylinders but no good solid hits. i guess ill start with what i know. Check the fuel pump and see if its gettng power and pumping fuel then uh idk. i guess ill figure it out

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ok some fuel pump is pumping and building pressure. still wont run. sprayed some ether in her and she will spin fire up and then shut back off. im reading good oil pressure on the dash gauge. also when i got the truck they guy said within a week it was using and losing about a gallon of oil. i got it and chacked and its three quarts low. i filled it up and still nothing. i kinda think its got issues with the hpop, but i dont know. is there anyway to diag that part of the system without having a super expensive scan tool.

 

On the top of the HPO res there is a plug, right hand side if your looking at it. Pull that plug and check to see if the HPO res is full. Should be less then 1/4" below the top. Unplug the ICP sensor in the drivers head (front port on the top of the head) and try cranking after that.

You can also try grounding out the IPR (which is below the fuel bowl mounted in the HPO pump. run one wire to ground and one to 12V and crank. It should crank and start, but run very rough. DO NOT leave it this way for more then 15-20 seconds. If that starts it then I would suspect the IPR.

But if its loosing alot of oil I would suspect injector o rings.

 

if i unplug the icp thats basically like putting full injection pressure on a cummins cr right?

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if the reservoir is low what is usually the cause? and what would be signs of leaking injector orings? the guy said when he would drive it it would be hard to start nbut would run good for a bit but after a mile it would run a mile it would start to lose power and the further you drive the worse it would get. he drove three miles to my house and then within about 400 feet of my driveway it would barely move then finally shut off. when i leave wrok ima go home and try that stuff. thanks for all your help

 

Only thing unpluging the ICP sensor does is make the PCM go to a default value on ICP, so if the ICP sensor was bad and not reading 500psi of ICP unpluging it would let it start.

Jumping the IPR will close it completely giving you the full pressure of the HPOP.

if the res is low, it means there is a leak somewhere, be it in the IPR, injectors or HPOP... Or the LPOP is bad and not filling the res.

 

well i think the lpop is good because its reading good oil pressure on the gauge. just wondering if it matters which wire on the ipr should see voltage or if it matters. would a leaking injector oring cause a no start, or a slow start. just wondering bc it wont start at all. i cranked for a total of like 15 mins in a 30 min span. i shoot ether in it fires up and then shuts back off. i just figured that the oring would cause a slow to build pressure situation, but once it started that it would keep running but idk. dont mean to be annoying just fascinated by learning something new

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ok i just checked the reservoir and there is oil to about .5 inches from the outside edge of the plug hole. i finally got my pc working and hooked it up. i unplugged the icp and there is oil in it. but it set a code for the icp open circuit. cranked, it hit and then does the same thing so i checked the injection control pressure on pc and it read between 1800 and 2200 psi not sure if thats good or not. i didnt jump the ipr because wasnt sure of wiring, which needs power and which needs ground or if it matters. it had a stored p0340 but has a nearly new grey cmp. it won reset this code after attempting to start for 30 secs 3 different times. and i want to say the ipr was saying 60 % but ill have to check tommorrow

 

Need to go thru and check to make sure there are no blown fuses, that the batterys are fully charged and its getting fuel. It sounds to me like the ICP is not building to 400#'s which is required before the injectors will even fire. Unplug the ICP sensor and have someone crank for you. You should hear the injectors start to fire (you can here the electric part of the injector start clicking)...

At that point you should start to see some white smoke out the tail pipe.

If you dont here the injectors firing, that tells me more then likely its something with the IDM (injector drive module)...