Won’t start
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Cargo Master
Joined: May 2001
Posts: 3,208
Likes: 13
Won’t start
2000 f250 power stroke 7.3 turns over won’t start. Cps changed tach still moves. Ipr with key on is 14.84% rises to 65% while cranking, Ipc climbs to over 3600 psi. Buzz test says all injectors good. Fuel pump runs and squirts fuel out the bowl. I have put 10gals of fuel in the tank. Idm swapped from a running truck. No change. Forscan doesn’t show a pid for injector pulse width. No smoke in exhaust. I have checked all the fuses. Swapped Idm relay with the blower relay no change. Kinda at my wits end. Any body have any ideas.
Got Data?
Joined: Dec 2012
Posts: 4,236
Likes: 1,368
From: Lake Stevens, WA
You've done alot of the basics, that's good. Frustrating to have a no start. There is a no-start flowchart in the tech folder at the top of the forum [LINK]
No smoke tells me no fuel pressure. Let's see how strong that fuel squirt is with a gauge if possible. Easy method to do this in my signature.
PID for fuel pulse width in Forscan is FUELPW.
No smoke tells me no fuel pressure. Let's see how strong that fuel squirt is with a gauge if possible. Easy method to do this in my signature.
PID for fuel pulse width in Forscan is FUELPW.
Got Data?
Joined: Dec 2012
Posts: 4,236
Likes: 1,368
From: Lake Stevens, WA
3600psi ICP seems unusually high for a stock HPOP. Have you tried unplugging the ICP sensor and see if it starts? Is the ICP a Motorcraft part?
How is the oil level?
What is the cranking RPM and cranking voltage? Batteries, cables in good shape?
How is the oil level?
What is the cranking RPM and cranking voltage? Batteries, cables in good shape?
Got Data?
Joined: Dec 2012
Posts: 4,236
Likes: 1,368
From: Lake Stevens, WA
Alright. I forgot to ask, any codes come up?
If you can check that fuel PW, we can see if the IDM and PCM are sync'd up. WTS light comes on? All fuses good?
Is the IPR tinnerman nut on tight?
If you can check that fuel PW, we can see if the IDM and PCM are sync'd up. WTS light comes on? All fuses good?
Is the IPR tinnerman nut on tight?
Logistics Pro
Joined: Oct 2011
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From: Mcdonough, GA
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FTE Leadership Emeritus
Joined: May 2014
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From: Lake Hartwell, GA
In addition to the "no start flow chart" posted above by BWST, there is a "no start diagnostic chart by Ford" at the link below.
https://www.ford-trucks.com/forums/a...4&d=1588427681
The 7.3L PSD Tech Folder which has a wealth of information in it can be found by clicking here.
https://www.ford-trucks.com/forums/a...4&d=1588427681
The 7.3L PSD Tech Folder which has a wealth of information in it can be found by clicking here.
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Thread Starter
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Cargo Master
Joined: May 2001
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Did a fuel pressure test it makes 52 lbs. how long after key on should it take. This one is a bit slow but gets there. The only thing we haven’t swapped out or replaced is the ipr. I have a Motor-craft ordered. What a pain in the *** this has become.
any other ideas
any other ideas
Got Data?
Joined: Dec 2012
Posts: 4,236
Likes: 1,368
From: Lake Stevens, WA
My fuel pressure goes up quickly, within a second or so. Once you get it started, it might be good to measure it on a WOT run and see if the pump can keep up. It should be ok for starting though.
ICP climbing to 3600psi does not make sense. Like Paul said, any chance it's 360psi? That would point to a stuck IPR, and swapping out or cleaning/rebuilding it might just do it.
ICP climbing to 3600psi does not make sense. Like Paul said, any chance it's 360psi? That would point to a stuck IPR, and swapping out or cleaning/rebuilding it might just do it.
Thread Starter
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Cargo Master
Joined: May 2001
Posts: 3,208
Likes: 13
There are no codes.
wts lights comes on stays on about the right amount of time
Fuel pulse width runs from 2.6 ms to 4 ms (this in spec)
cranking rpm is just above 100 rpm I can make it go higher with more batteries jump in
oil level is full. HPOP was about an inch low we filled to the top.
from what I have read if the ipr solenoid is shorted it can cause the pressure to go up to 4000 psi at which point a poppet valve opens to relieve.
I have followed the the no start flow chart and I am down to the ipr..
hope this answered all the questions. I do appreciate all the help
one more point. This girl has 303,000 miles on it and the ipr looks original
wts lights comes on stays on about the right amount of time
Fuel pulse width runs from 2.6 ms to 4 ms (this in spec)
cranking rpm is just above 100 rpm I can make it go higher with more batteries jump in
oil level is full. HPOP was about an inch low we filled to the top.
from what I have read if the ipr solenoid is shorted it can cause the pressure to go up to 4000 psi at which point a poppet valve opens to relieve.
I have followed the the no start flow chart and I am down to the ipr..
hope this answered all the questions. I do appreciate all the help
one more point. This girl has 303,000 miles on it and the ipr looks original
Cargo Master
Joined: Sep 2015
Posts: 2,857
Likes: 365
There are no codes.
wts lights comes on stays on about the right amount of time
Fuel pulse width runs from 2.6 ms to 4 ms (this in spec)
cranking rpm is just above 100 rpm I can make it go higher with more batteries jump in
oil level is full. HPOP was about an inch low we filled to the top.
from what I have read if the ipr solenoid is shorted it can cause the pressure to go up to 4000 psi at which point a poppet valve opens to relieve.
I have followed the the no start flow chart and I am down to the ipr..
hope this answered all the questions. I do appreciate all the help
one more point. This girl has 303,000 miles on it and the ipr looks original
wts lights comes on stays on about the right amount of time
Fuel pulse width runs from 2.6 ms to 4 ms (this in spec)
cranking rpm is just above 100 rpm I can make it go higher with more batteries jump in
oil level is full. HPOP was about an inch low we filled to the top.
from what I have read if the ipr solenoid is shorted it can cause the pressure to go up to 4000 psi at which point a poppet valve opens to relieve.
I have followed the the no start flow chart and I am down to the ipr..
hope this answered all the questions. I do appreciate all the help
one more point. This girl has 303,000 miles on it and the ipr looks original
Got Data?
Joined: Dec 2012
Posts: 4,236
Likes: 1,368
From: Lake Stevens, WA
Thanks for all of this info. I didn't know that about a shorted IPR solenoid and what it can do to ICP. Good to know.
At 303K, pretty good life on the IPR. It does sound like a good next step to change it.
100 rpm is pretty low. Bare minimum on the Oregon Fuel Injection no-start checklist in my signature (under Troubleshooting). Like Jstihl said, would be good to get that up. Sounds like you've tried jumping with more batteries and it has not started. Does cranking voltage stay above 10.2V, preferably 10.5V? If not, it would be good to check or replace both batteries, and check battery cables for voltage drop. If those are good, I'd suspect the starter is tired.
No codes with Forscan, that's good. Down to IPR and HPOP at this point on the oil side. We can hook up a mechanical gauge to double-check HPOP pressure if we get that far.
At 303K, pretty good life on the IPR. It does sound like a good next step to change it.
100 rpm is pretty low. Bare minimum on the Oregon Fuel Injection no-start checklist in my signature (under Troubleshooting). Like Jstihl said, would be good to get that up. Sounds like you've tried jumping with more batteries and it has not started. Does cranking voltage stay above 10.2V, preferably 10.5V? If not, it would be good to check or replace both batteries, and check battery cables for voltage drop. If those are good, I'd suspect the starter is tired.
No codes with Forscan, that's good. Down to IPR and HPOP at this point on the oil side. We can hook up a mechanical gauge to double-check HPOP pressure if we get that far.