diesel wont start when warm?

petey gmc · 11-11-2008, 10:59 AM

Have a 2004 ford diesel and it starts great when cold but once it has warmed up and you shut it off ...it wont start but if you let it cool off it starts fine?....any ideas?
Thanks

75K30 · 11-11-2008, 11:53 AM

I am gonna go out on a limb here and asy that this could be the HPOP.
There are a few other possibilities, but high pressure oil is the common problem here.
Sounds as though you have a high pressure leak, or faulty pump.
Not fun!!!

tjzz4 · 11-11-2008, 12:49 PM

I agree with 75 assuming it DOES crank over...

mrjohnwayne · 11-11-2008, 01:21 PM

yeah I'm thinking something with the ICP as well...

If it is the PUMP itself I hope you have a warranty. Most places will pull the cab to replace the HPOP on a 6.0...

petey gmc · 11-11-2008, 02:31 PM

Ya it does crank over

petey gmc · 11-11-2008, 02:32 PM

it will start with starting fluid

tjzz4 · 11-11-2008, 02:49 PM

Yeah... As long as the valves are opening and you have some compression that will make it start... You need to get in there and look at ICP with a scanner while cranking. Oil change interval OK?

petey gmc · 11-11-2008, 05:30 PM

oil chnge interval is ok....thanks guys ill check it ouy

75K30 · 11-11-2008, 11:15 PM

What is the criteria for the ICP? Some 300 PSI right?
Only a quality scanner will tell you what the potential problems could be, but unfortunately, I am still thinking HPOP.
I wish I was a better diesel mechanic. Always something to learn....
Please advise. This will eventually be a topic that will benifit a future user that uses the search function.

tjzz4 · 11-12-2008, 11:36 AM

ICP need to see 500 PSI before injectors are enabled. There could be several contributors here... faulty ICP sensor.. Failed IPR.. Or.. as you say.. HPOP could very well be the culprit.

11-11-2008, 10:59 AM	#1
petey gmc Junior Member Join Date: Nov 2008 Posts: 7	diesel wont start when warm? Have a 2004 ford diesel and it starts great when cold but once it has warmed up and you shut it off ...it wont start but if you let it cool off it starts fine?....any ideas? Thanks

11-11-2008, 01:21 PM	#4
mrjohnwayne Senior Moderator Join Date: Apr 2005 Location: Texas Posts: 3,789	yeah I'm thinking something with the ICP as well... If it is the PUMP itself I hope you have a warranty. Most places will pull the cab to replace the HPOP on a 6.0... __________________ John Wayne 2000 F-350 7.3L Powerstroke 4x4

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11-11-2008, 11:53 AM	#2
75K30 Senior Member Join Date: Jul 2006 Posts: 3,299	I am gonna go out on a limb here and asy that this could be the HPOP. There are a few other possibilities, but high pressure oil is the common problem here. Sounds as though you have a high pressure leak, or faulty pump. Not fun!!!

11-11-2008, 12:49 PM	#3
tjzz4 Senior Member Join Date: Oct 2007 Posts: 316	I agree with 75 assuming it DOES crank over...

11-11-2008, 02:31 PM	#5
petey gmc Junior Member Join Date: Nov 2008 Posts: 7	Ya it does crank over

11-11-2008, 02:32 PM	#6
petey gmc Junior Member Join Date: Nov 2008 Posts: 7	it will start with starting fluid

11-11-2008, 02:49 PM	#7
tjzz4 Senior Member Join Date: Oct 2007 Posts: 316	Yeah... As long as the valves are opening and you have some compression that will make it start... You need to get in there and look at ICP with a scanner while cranking. Oil change interval OK?

11-11-2008, 05:30 PM	#8
petey gmc Junior Member Join Date: Nov 2008 Posts: 7	oil chnge interval is ok....thanks guys ill check it ouy

11-11-2008, 11:15 PM	#9
75K30 Senior Member Join Date: Jul 2006 Posts: 3,299	What is the criteria for the ICP? Some 300 PSI right? Only a quality scanner will tell you what the potential problems could be, but unfortunately, I am still thinking HPOP. I wish I was a better diesel mechanic. Always something to learn.... Please advise. This will eventually be a topic that will benifit a future user that uses the search function.

11-12-2008, 11:36 AM	#10
tjzz4 Senior Member Join Date: Oct 2007 Posts: 316	ICP need to see 500 PSI before injectors are enabled. There could be several contributors here... faulty ICP sensor.. Failed IPR.. Or.. as you say.. HPOP could very well be the culprit.