7.3 powerstroke issue

TwinTurboNotch · 12-18-2011, 01:41 PM

Does anyone have any knowledge on the 7.3 powerstrokes? Mine quit running. It had been running fine with no issues, I left the house the other night and it made it about 500 ft and the check angine light came on. I decided to drive it around the block and bring her home but she didn't make it. It just quit and wouldn't start. I tried changing the cam position sensor but that didn't work. I plugged in a code reader but it's not showing any codes. It will fire on ether so I feel it's a fuel issue. Unfortunaly I really don't know how to trouble shoot this fuel system. Any suggestions are welcome.

WTFWSAT · 12-18-2011, 06:46 PM

You may need to get a hold of a modis scanner or an actual ford scanner. Some of the general scanners wont show some codes. I think the 7.3 fuel system is similar to the 6.0's so i would check the IPR (injector pressure regulator) sometimes the screens get dirty. Heres a link
Or it could be the ICP sensor (injector control pressure) LINK

Try to get a hold of a scanner before you start throwing parts at it.

WTFWSAT · 12-18-2011, 06:50 PM

Try to unplug the ICP sensor and see if it will run longer. With this unplugged the truck will run but in limp mode. Should narrow down your issue.

MARTYROBBINS · 12-18-2011, 07:16 PM

i know there was a issue with s=the cam crank harness thet runs under the intake the tow truck at work did the same thing check engine light came on then it just quit i have a genesis scanner at work i could bring and scan for you if you pm me the info

TwinTurboNotch · 12-18-2011, 09:07 PM

Quote:

Originally Posted by WTFWSAT

Try to unplug the ICP sensor and see if it will run longer. With this unplugged the truck will run but in limp mode. Should narrow down your issue.

Thanks, I will try this tomorrow

TwinTurboNotch · 12-18-2011, 09:08 PM

Quote:

Originally Posted by MARTYROBBINS

i know there was a issue with s=the cam crank harness thet runs under the intake the tow truck at work did the same thing check engine light came on then it just quit i have a genesis scanner at work i could bring and scan for you if you pm me the info

Thanks for the offer. I might just have to take you up on it

. We'll see how tomorrow goes.

AverageJoe · 12-18-2011, 09:20 PM

There is a harness that runs through the valve cover gasket, a friend of mine had his come unplugged on the inside. Not sure, but I think it made the truck shut off.

spdracr0 · 12-19-2011, 12:16 AM

injector driver? not sure of the 7.3 but it is common on the 6.0 from what I hear

bwelch · 12-19-2011, 02:23 AM

Quote:

Originally Posted by spdracr0

injector driver? not sure of the 7.3 but it is common on the 6.0 from what I hear

This is what I'm thinking

TwinTurboNotch · 12-19-2011, 01:17 PM

Well I tried another scanner today and it too was showing no codes. I also tried unplugging the ICP sensor but that didn't work either. I guess it's time to dig a little further and start tearing this thing apart. I'll Looking into the injector harness next

WTFWSAT · 12-19-2011, 02:53 PM

What scanner did you use this time? Check the fuel filter on top of the engine to see if its getting fuel. Unscrew the cap the start it back 1-2 threads, have someone turn the key on and watch for fuel to come out that will check to see if your fuel pump is working. That may help narrow it down to the injector driver or high pressure oil issue. If you can acquire a scanner that will show ICP pressure as your cranking it must be above 500 psi before the truck will start. If your IPR screen is dirty or plugged you wont get pressure either-this should be another easy check just unscrew it and check the end.

TwinTurboNotch · 12-20-2011, 03:48 PM

I used an Actron CP9580 Autoscanner Plus Scan Tool w/CodeConnect and ABS. Not a high doller scanner, but not junk either. I do get fuel to my filter bowl. The truck just cranks and cranks not even trying to start. I hate tearing into it without knowing which direction to look. I'm still tring to get a better scanner so that I trouble shoot a little better. Thanks for your help.

cliff-1972 · 12-20-2011, 08:53 PM

What year is your truck?The early 99's had issues with the HPOP.The easiest way to check this to screw a gauge into the oil gallery rail on the head.This is the rail your ICP is screwed into.Like was said before you need at least 500psi to crank.The thread size on the rail is -5 JIC male.I have some fittings and a gauge if needed.I will PM you my number.I ran into one truck acting like yours is and it turned out to be the HPOP.

BigdaddyDupree · 12-28-2011, 10:03 AM

So what was it

TwinTurboNotch · 12-28-2011, 08:59 PM

I still haven't gotten it running yet. I was sick for a few day and I just started digging into it today. I checked the pressure of the HPOP and it's over 2000psi while cranking. I pulled the valve covers and checked the harness. While the valve cover was off I had the wife crank it over while I listen to the injectors. I didn't hear or feel any clicking coming from them. I'm thinking the my IDM (injector drive module) is shot, But i hate to purchase a new one without being sure.

BigdaddyDupree · 12-28-2011, 10:09 PM

yeah im watching this real close because i have the same truck. is yours stock or basic programmer and exhaust?

bwelch · 12-28-2011, 10:28 PM

My buddy ran one of these instead of the oem one because it was less than half price. He didn't have any trouble out of it. They rebuild the stock unit.

http://pensacoladiesel.com/98-03-inj...ve-module.html

toybreaker · 01-01-2012, 03:01 PM

I have a good IDM sitting on the shelf... And an HPOP with IPR. No icp's left though. PM me if you are interested.

WTFWSAT · 01-08-2012, 12:19 PM

Update?

TwinTurboNotch · 01-09-2012, 07:23 PM

I did get the truck running again. I purchased another IDM and it started but still wasn't running right, and now the check engine light was on. But at least it would start now. I found a wiring schematic online and was able to use my multimeter to see what my injector resistance was at the Harness where it plugs into the IDM. Well even though I already pull the valve covers and checked the gasket harness, my multimeter was telling me that I had an issue on the passanger side. I then pulled the cover again and push in on all the wiring connecters. Testing it again showed that everything was now normal. I found that the injector harness where it plugs into the gasket had a clip that would allow it com apart. I took my heat gun softened up the clip, bent it out so that it would grab and not come apart again. I'm guessing that when I left the house and it started running rough, the harness had come apart and I was only on 4 cylinders, while tring to make it around the block to get it home it ended up frying my IDM. I'm just happy that it's running again.

12-18-2011, 01:41 PM	#1
TwinTurboNotch Senior Member Join Date: Feb 2007 Posts: 78	7.3 powerstroke issue Does anyone have any knowledge on the 7.3 powerstrokes? Mine quit running. It had been running fine with no issues, I left the house the other night and it made it about 500 ft and the check angine light came on. I decided to drive it around the block and bring her home but she didn't make it. It just quit and wouldn't start. I tried changing the cam position sensor but that didn't work. I plugged in a code reader but it's not showing any codes. It will fire on ether so I feel it's a fuel issue. Unfortunaly I really don't know how to trouble shoot this fuel system. Any suggestions are welcome.

12-18-2011, 06:46 PM	#2
WTFWSAT Senior Member Join Date: Nov 2007 Location: Summerville Posts: 861	You may need to get a hold of a modis scanner or an actual ford scanner. Some of the general scanners wont show some codes. I think the 7.3 fuel system is similar to the 6.0's so i would check the IPR (injector pressure regulator) sometimes the screens get dirty. Heres a link Or it could be the ICP sensor (injector control pressure) LINK Try to get a hold of a scanner before you start throwing parts at it. __________________ Fastest stock computer 5.0 on the planet! Looking for cheeep msd 6al! PM me! 88 Coupe (turtle) 03 Cobra (tortoise)

12-18-2011, 06:50 PM	#3
WTFWSAT Senior Member Join Date: Nov 2007 Location: Summerville Posts: 861	Try to unplug the ICP sensor and see if it will run longer. With this unplugged the truck will run but in limp mode. Should narrow down your issue. __________________ Fastest stock computer 5.0 on the planet! Looking for cheeep msd 6al! PM me! 88 Coupe (turtle) 03 Cobra (tortoise)

12-19-2011, 02:53 PM	#11
WTFWSAT Senior Member Join Date: Nov 2007 Location: Summerville Posts: 861	What scanner did you use this time? Check the fuel filter on top of the engine to see if its getting fuel. Unscrew the cap the start it back 1-2 threads, have someone turn the key on and watch for fuel to come out that will check to see if your fuel pump is working. That may help narrow it down to the injector driver or high pressure oil issue. If you can acquire a scanner that will show ICP pressure as your cranking it must be above 500 psi before the truck will start. If your IPR screen is dirty or plugged you wont get pressure either-this should be another easy check just unscrew it and check the end. __________________ Fastest stock computer 5.0 on the planet! Looking for cheeep msd 6al! PM me! 88 Coupe (turtle) 03 Cobra (tortoise)

12-20-2011, 08:53 PM	#13
cliff-1972 Senior Member Join Date: Feb 2011 Location: Moncks Corner,S.C Posts: 292	What year is your truck?The early 99's had issues with the HPOP.The easiest way to check this to screw a gauge into the oil gallery rail on the head.This is the rail your ICP is screwed into.Like was said before you need at least 500psi to crank.The thread size on the rail is -5 JIC male.I have some fittings and a gauge if needed.I will PM you my number.I ran into one truck acting like yours is and it turned out to be the HPOP. __________________ 1964 Impala 468BBC,T350 transbrake,4.30 9",10 point and 10.5 M/T's 1996 F250 4X4 12V Cummins,compound turbo 63mm over 75mm,cam,520cc pump,full billet 4R100 563hp&936ft.lbs w/a bad fuel pump and on a dynojet...just an old hunting truck

12-18-2011, 07:16 PM	#4
MARTYROBBINS Senior Member Join Date: Nov 2011 Location: NORTH CHARLESTON Posts: 593	i know there was a issue with s=the cam crank harness thet runs under the intake the tow truck at work did the same thing check engine light came on then it just quit i have a genesis scanner at work i could bring and scan for you if you pm me the info

12-18-2011, 09:20 PM	#7
AverageJoe Senior Member Join Date: Jun 2008 Location: Summerville Posts: 1,683	There is a harness that runs through the valve cover gasket, a friend of mine had his come unplugged on the inside. Not sure, but I think it made the truck shut off.

12-19-2011, 12:16 AM	#8
spdracr0 Senior Member Join Date: Apr 2011 Posts: 568	injector driver? not sure of the 7.3 but it is common on the 6.0 from what I hear

12-19-2011, 01:17 PM	#10
TwinTurboNotch Senior Member Join Date: Feb 2007 Posts: 78	Well I tried another scanner today and it too was showing no codes. I also tried unplugging the ICP sensor but that didn't work either. I guess it's time to dig a little further and start tearing this thing apart. I'll Looking into the injector harness next

12-20-2011, 03:48 PM	#12
TwinTurboNotch Senior Member Join Date: Feb 2007 Posts: 78	I used an Actron CP9580 Autoscanner Plus Scan Tool w/CodeConnect and ABS. Not a high doller scanner, but not junk either. I do get fuel to my filter bowl. The truck just cranks and cranks not even trying to start. I hate tearing into it without knowing which direction to look. I'm still tring to get a better scanner so that I trouble shoot a little better. Thanks for your help.

12-28-2011, 10:03 AM	#14
BigdaddyDupree Senior Member Join Date: Jul 2008 Location: MACEDONIA Posts: 4,967	So what was it __________________ . What you wanna do?

12-28-2011, 08:59 PM	#15
TwinTurboNotch Senior Member Join Date: Feb 2007 Posts: 78	I still haven't gotten it running yet. I was sick for a few day and I just started digging into it today. I checked the pressure of the HPOP and it's over 2000psi while cranking. I pulled the valve covers and checked the harness. While the valve cover was off I had the wife crank it over while I listen to the injectors. I didn't hear or feel any clicking coming from them. I'm thinking the my IDM (injector drive module) is shot, But i hate to purchase a new one without being sure.

12-28-2011, 10:09 PM	#16
BigdaddyDupree Senior Member Join Date: Jul 2008 Location: MACEDONIA Posts: 4,967	yeah im watching this real close because i have the same truck. is yours stock or basic programmer and exhaust? __________________ . What you wanna do?

12-28-2011, 10:28 PM	#17
bwelch Senior Member Join Date: Aug 2009 Posts: 3,774	My buddy ran one of these instead of the oem one because it was less than half price. He didn't have any trouble out of it. They rebuild the stock unit. http://pensacoladiesel.com/98-03-inj...ve-module.html __________________

01-01-2012, 03:01 PM	#18
toybreaker Senior Member Join Date: Sep 2009 Location: Piti, Guam Posts: 203	I have a good IDM sitting on the shelf... And an HPOP with IPR. No icp's left though. PM me if you are interested. __________________ I am too good for something! I set a very bad example!

01-08-2012, 12:19 PM	#19
WTFWSAT Senior Member Join Date: Nov 2007 Location: Summerville Posts: 861	Update? __________________ Fastest stock computer 5.0 on the planet! Looking for cheeep msd 6al! PM me! 88 Coupe (turtle) 03 Cobra (tortoise)

01-09-2012, 07:23 PM	#20
TwinTurboNotch Senior Member Join Date: Feb 2007 Posts: 78	I did get the truck running again. I purchased another IDM and it started but still wasn't running right, and now the check engine light was on. But at least it would start now. I found a wiring schematic online and was able to use my multimeter to see what my injector resistance was at the Harness where it plugs into the IDM. Well even though I already pull the valve covers and checked the gasket harness, my multimeter was telling me that I had an issue on the passanger side. I then pulled the cover again and push in on all the wiring connecters. Testing it again showed that everything was now normal. I found that the injector harness where it plugs into the gasket had a clip that would allow it com apart. I took my heat gun softened up the clip, bent it out so that it would grab and not come apart again. I'm guessing that when I left the house and it started running rough, the harness had come apart and I was only on 4 cylinders, while tring to make it around the block to get it home it ended up frying my IDM. I'm just happy that it's running again.