I was looking at some of the threads and caint get an answer to this problem..
This is a weard one to me, I have a 94.5 Ford F-350 P.S. this problem started about a few weeks ago when the engine is cold it starts up fine but after it has been ran and gets up to temp and you shut it down it will not start back up
my first thought might been the H.P.O.P leaking down but before cranking it up
"cold" it looks normal about 1/2" from the top of the reservoir. so I ran it in the yard about 1800 R.P.M's for about 30min. shut it down and waited abou ten min. but I went back to check the oil level and it was ok????
but it will not start!! any Ideas????????

 

Replace the IPR, or you can just replace the orings in the IPR. Also check the nut on it, make shure its not loose. Most likely your problem. Drain some fuel out of the fuel filter check to see color of fuel, if color is on black side it could also be bad injector orings.

Bill

 

Yea The Fuel looks good. I wiil check it out when I get back home Thanks..

 

Yes, I belive we had a truck at work that did this as well - We could even change the oil in the hot engine and it would start =) I believe it was the o-ring in question.

 

Do you have to remove the pump to get the I.P.R. out??

and were can I just get the o-ring's the stealer ship just wants to sell me a new I.P.R.

 

The IPR will come right out.
Oring part#
Ford-F6TZ-9C977AN or AA?
International-1825806C92
Check E-Bay. I have seen oring kits and IPR's.

Links Other part# here
http://www.thedwilsons.com/powerstro...t_Numbers.html

Link for IPR-Replace/Repair
http://cw-diesel.com/LuxSite/IPRInfo.htm

Blackclowd
http://www.blackclouddiesel.com/Ford/codepigtails.htm

Click on Links.

Bill

 

FYI: You can verify the IPR trouble by unplugging the ICP when hot. If it starts the IPR need attention.

 

Or Here. Its the same.
As stated above. Unplug the ICP with hot motor and see if starts.
http://cgi.ebay.com/ebaymotors/NEW-P...QQcmdZViewItem

Bill

 

Got back home today took the plug out of the H.P.O.P and installed an oil
guage there "just for grins" oil pressure reading ok there about the same as my
A- piller guage was reading.. ran the motor again for about 30min.
and tried unpluging the ICP but still would not crank back up.
today when I get home a friend of mine is going to let me borrow a hi pressure
guage so I can read the HPOP pressure just to see what it is doing.
any other Ideas????????????

 

Installing the gauge on the LPOP will not give you any info you are looking for.
You have to install a gauge on the HPOP. You are looking for about 500psi for motor to start.

Bill

 

I would just replace the ipr o-ring and note mess with all the testing. it takes about and hour or 1.5 to do the o-rings and they are cheap. I just went through the same thing on my 95. i also don't think that unpluggin the ICP will make it start when the o-rings are bad. The ICP will still be telling the computer not enough oil pressure the IPR will go to as high of a duty cycle it can to make the pressure with hot oil but it just can't do it. Has anyboy had bad o-rings then unplugged the ICP and have their truck start?

 

I would think its possible. But unlikely. To many variables. (oil vis, week pump,how much of a leak past orings,ect). I dont know how fast the IPR can bleed the pressure. Volume of pump vs volume of IPR not considering losses at injectors when fireing. Might build pressure if you disconnected the inj's. Unknown to me. I would think as the IPR ages and starts to leak the ICP compensates for the loss untill the day comes where it cannot. Thus no pressure, no start.

Bill

 

When i did the ipr o-rings on my 95 last spring, i tried unplugging the icp before pulling the ipr out. It didn't make any difference other than triggering the check engine light. Still wouldn't start.

When i took the ipr out, i spotted the bad o-ring immediately. Now the truck starts better than it ever did since i bought it used.

I imagine anyone who replaced their ipr o-rings will notice the difference in how long their engine had to crank to fire before, to how it will fire almost instantly after o-rings. At least that's what i found. Now i see how long my 96 has to crank before firing, just like my 95 was before, 5 seconds or so, so i'm going to put a new set of o-rings in that ipr too.

 

Thanks Bill, No I was going to install the guage on one of the ports on the head to read the pressure, but after more of the replyes that I gotten it appers
that the O-ring's are bad on the IPR. but measuring the pressure would
deffiently tell you that O-ring's are bad or the IPR is stuck wide open
not letting the pump to build pressure...... Keith

 

I believe that that test points out a bad ICP. With the ICP unplugged the PCM will substitute an assumed value for the ICP input and allow the vehicle to start.