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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 07-02-2011, 01:28 AM   #1 (permalink)
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Angry 7.3 cutting out

my truck in signature ,yes a 7.3. its been cutting out sometimes when you take foot of it while driving.
it has now started to fail when i put my foot in to it from takeoff, it also sometimes grabs some low revs from take off ,then without moving my foot on the pedal, it will grab all the revs and take of like a cut cat.
i have replaced cps twice now,
swapped out ecm ,twice ,buzz tested injectors ok,
replaced icp , ipr, accelerator pedal and sensor,removed valve cover and checked connections on uvch, checked voltage on harness.
where can i go now to find out my problem.
truck fires up straight away after it cuts out, and is not throwing any codes.
need some help from you 7.3 gurus please.
99250
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early 1999 ,f250,psd,s/cab,7.3,3.73 ,4*4,short box
harvest gold, snug top cover,xle 4 ,ais filter, bts trans ,
isspro pyro ,trans temp guages.autometer boost
bought new from spokane,wa ,and converted to rhd in australia. sold.
forrest river wildcat, 30rlbs. sold.
06, f250, 7.3 [standard out of brazil factory] bts valve body,tuned by cale at bts.firestone air bags on rear.coolant filter ,isspro trans,temp, boost, pyro guages.
cougar , 5er model 309, fitted with full air brakes.,trail air hitch

Last edited by 99250; 07-02-2011 at 02:31 AM. Reason: add more info
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Old 07-02-2011, 09:52 AM   #2 (permalink)
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Are the dash lights on as it stalls? KOEO, KOER tests could be helpful if this is a sensor issue. Also check the harness that sits on the drivers valve cover for chafe on the bottom. You will need to unbolt n look, feeling won't do it.
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Old 07-02-2011, 04:35 PM   #3 (permalink)
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thanks, i havent checked that harness there. will do so when its gets daylight.
i havent noticed the dash lights yet but will do that also.
truck runs real strong when im cruising, its only this statring and stopping when it plays up.
thanks
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early 1999 ,f250,psd,s/cab,7.3,3.73 ,4*4,short box
harvest gold, snug top cover,xle 4 ,ais filter, bts trans ,
isspro pyro ,trans temp guages.autometer boost
bought new from spokane,wa ,and converted to rhd in australia. sold.
forrest river wildcat, 30rlbs. sold.
06, f250, 7.3 [standard out of brazil factory] bts valve body,tuned by cale at bts.firestone air bags on rear.coolant filter ,isspro trans,temp, boost, pyro guages.
cougar , 5er model 309, fitted with full air brakes.,trail air hitch
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Old 07-02-2011, 09:00 PM   #4 (permalink)
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pulled both plugs on valve cover , checked and cleaned, ok.
no dash lights come on when stalls?
where to now.
can a gpr cause these symptons?
99250
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early 1999 ,f250,psd,s/cab,7.3,3.73 ,4*4,short box
harvest gold, snug top cover,xle 4 ,ais filter, bts trans ,
isspro pyro ,trans temp guages.autometer boost
bought new from spokane,wa ,and converted to rhd in australia. sold.
forrest river wildcat, 30rlbs. sold.
06, f250, 7.3 [standard out of brazil factory] bts valve body,tuned by cale at bts.firestone air bags on rear.coolant filter ,isspro trans,temp, boost, pyro guages.
cougar , 5er model 309, fitted with full air brakes.,trail air hitch
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Old 07-02-2011, 09:07 PM   #5 (permalink)
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Quote:
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can a gpr cause these symptons?
No, once the truck is running and warmed up, the GPR is out of the picture. Don't waste your time with that.

Did you check underneath the main harness that comes from the truck body and connects to the engine over the driver's side (oops, LEFT side) valve cover, like Tom suggested. If it's chafed there, it would cause shorting problems on the injector circuits.

It would really be good to be able to monitor/record ICP, IPR duty cycle, RPM and AP position while you're running (stalling). That would probably shed some light on what's going on.
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Old 07-02-2011, 09:19 PM   #6 (permalink)
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thanks, just sent a pm before i read this post.
yes i pulled the ones at the valve cover and checked them.
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early 1999 ,f250,psd,s/cab,7.3,3.73 ,4*4,short box
harvest gold, snug top cover,xle 4 ,ais filter, bts trans ,
isspro pyro ,trans temp guages.autometer boost
bought new from spokane,wa ,and converted to rhd in australia. sold.
forrest river wildcat, 30rlbs. sold.
06, f250, 7.3 [standard out of brazil factory] bts valve body,tuned by cale at bts.firestone air bags on rear.coolant filter ,isspro trans,temp, boost, pyro guages.
cougar , 5er model 309, fitted with full air brakes.,trail air hitch
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Old 07-02-2011, 10:29 PM   #7 (permalink)
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hooked up the ae,
677rpm
506 icp
10.16icp duty cycle
12.99 ap
cant get this ae to record a session, am trying to figure this out to.
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early 1999 ,f250,psd,s/cab,7.3,3.73 ,4*4,short box
harvest gold, snug top cover,xle 4 ,ais filter, bts trans ,
isspro pyro ,trans temp guages.autometer boost
bought new from spokane,wa ,and converted to rhd in australia. sold.
forrest river wildcat, 30rlbs. sold.
06, f250, 7.3 [standard out of brazil factory] bts valve body,tuned by cale at bts.firestone air bags on rear.coolant filter ,isspro trans,temp, boost, pyro guages.
cougar , 5er model 309, fitted with full air brakes.,trail air hitch
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Old 07-03-2011, 01:16 AM   #8 (permalink)
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When we talk about the harness, it's not the plug itself, but the wires about 2 inches away where it rests on the valve cover. It's normally covered in soot and grime (Except on Woodnthings truck) and takes a good look to see any bare spots. The injector circuits and also the EOT circuit reside on the lower wires.
If you have AE, perform the KOEO and KOER tests. The truck has to be at operating temp to do the KOER test. If you are not getting dash lights when it stalls, I would lean towards a harness issue, particularly power to the PCM. The fuel htr is a big culprit for popping the PCM fuse, but perhaps yours is srill malfunctioning (int shorting). Try unplugging it. Do you have any chips installed? If you do, pull it. The ignition switch can cause some issues if the contacts start going bad internally, but I wouldn't replace it unless it can be proven to be bad. That can be done by starting the truck and then wiggling and smacking the switch a bit, trying to see if the engine stalls. Same can be done with the harnesses, but just be careful. You're not trying to make it run, you're trying to find the problem, if you understand what I'm saying.
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99.5 PS CC 4x4 SRW ZF-6
Triple Pillar Gauges; Fuel pres, Pyro, Boost
AE, Alldatadiy, and half a clue
- AKA "The Big White Truck"
______________________________________________
The first part to be thrown at these trucks should be a PSD compatible scanner

PM please. No Visitor Msg if you want a response anytime soon
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Old 07-03-2011, 01:20 AM   #9 (permalink)
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Quote:
Originally Posted by 99250 View Post
thanks, just sent a pm before i read this post.
yes i pulled the ones at the valve cover and checked them.
99250
Not the harnesses that go into the valve cover gasket, but the main harness that goes over the valve cover and plugs into the big connector.

Quote:
Originally Posted by 99250 View Post
hooked up the ae,
677rpm
506 icp
10.16icp duty cycle
12.99 ap
cant get this ae to record a session, am trying to figure this out to.
99250
Those numbers look good at idle, but I don't recall what the AP should read at idle.
Look up at the top left of the screen when you have the parameters displayed. There should be a spot to enter a file name and a record button. Enter a file name you can find again, and click the record button and then take off and see if you can get it to stall on you, then click the stop button (also upper left). You can play back the file on AE with the parameter graph screen up and watch the parameters change as if you were driving. You can also open the file with Excel (or other spreadsheet program) and generate a static graph.
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First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version), AIS, coolant filter w/"hokum" bracket, regulated return, heated mirror mod, lighted cupholder, Marinco heater plug-in.

Hard or no-start? Check Here
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Old 07-03-2011, 02:58 AM   #10 (permalink)
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thanks guys,
i have pulled a code now, its p0220 i think thats accelerator circuit.
does anyone know how to check this circuit?
once again thanks for your help.
i have been checking at the plug , but will check the harness a bit further down.
noticed today if i really put the foot into it on take off it surgess like mad for three or four times then it will pick up full revs.
that surge will prolly go from 1000rpm to 3000rpm., then it goes like a cut cat the way it should. sometimes after the surge it dies completely.
hope im making a bit of sense here.
cheers
99250
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early 1999 ,f250,psd,s/cab,7.3,3.73 ,4*4,short box
harvest gold, snug top cover,xle 4 ,ais filter, bts trans ,
isspro pyro ,trans temp guages.autometer boost
bought new from spokane,wa ,and converted to rhd in australia. sold.
forrest river wildcat, 30rlbs. sold.
06, f250, 7.3 [standard out of brazil factory] bts valve body,tuned by cale at bts.firestone air bags on rear.coolant filter ,isspro trans,temp, boost, pyro guages.
cougar , 5er model 309, fitted with full air brakes.,trail air hitch
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Old 07-03-2011, 11:08 AM   #11 (permalink)
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On the accelerator pedal, there are 2 sensors. One is the IVS, Idle Validation Switch, which is just an on/off switch. You can monitor it with AE. When you push the pedal, it changes from open to closed, passing 12vdc back to the PCM to accelerate. The other sensor is the TPS, Throttle Position Sensor, which is a variable resister that gives throttle position. The 2 sensors work together and both can be monitored at the same time.
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99.5 PS CC 4x4 SRW ZF-6
Triple Pillar Gauges; Fuel pres, Pyro, Boost
AE, Alldatadiy, and half a clue
- AKA "The Big White Truck"
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The first part to be thrown at these trucks should be a PSD compatible scanner

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Old 07-03-2011, 02:44 PM   #12 (permalink)
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thanks for your help guys.
i have to fly out for work this week ,so the truck can sit in the shed till next weekend.
i will get my auto elec friend next week and go through the whole wiring system , as you have pointed out including the fuel heater thingy.
thanks
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early 1999 ,f250,psd,s/cab,7.3,3.73 ,4*4,short box
harvest gold, snug top cover,xle 4 ,ais filter, bts trans ,
isspro pyro ,trans temp guages.autometer boost
bought new from spokane,wa ,and converted to rhd in australia. sold.
forrest river wildcat, 30rlbs. sold.
06, f250, 7.3 [standard out of brazil factory] bts valve body,tuned by cale at bts.firestone air bags on rear.coolant filter ,isspro trans,temp, boost, pyro guages.
cougar , 5er model 309, fitted with full air brakes.,trail air hitch
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Old 07-03-2011, 03:28 PM   #13 (permalink)
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Man!, You must really be in the outback if you have to fly to get to work!! I'm in the country, but I can still drive
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99.5 PS CC 4x4 SRW ZF-6
Triple Pillar Gauges; Fuel pres, Pyro, Boost
AE, Alldatadiy, and half a clue
- AKA "The Big White Truck"
______________________________________________
The first part to be thrown at these trucks should be a PSD compatible scanner

PM please. No Visitor Msg if you want a response anytime soon
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Old 07-03-2011, 10:41 PM   #14 (permalink)
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I have a similar problem w/ the Excursion, had it for a couple years. Just hesitates sometimes from a stop, sometimes dies. Hesitates 25% of the time or less and dies 5% or less.

I started looking at the electrical components on the hpop side of things. Disconnected the ICP, no change. My WAG is the IPR, but this is only a guess. The vehicle is my wife's, so not my daily driver. Some how the IPR is not sensing the oil pressure change or the IPR is bleeding off a small amount of oil pressure during acceleration.

I believe it is on the HPOP side so if not the IPR, my next step is going after the HPOP pump.

I had to replace an IPR on the F350, but it wouldn't even start until it was replaced.
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Old 07-03-2011, 11:56 PM   #15 (permalink)
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Quote:
Originally Posted by moxyspirit View Post
I have a similar problem w/ the Excursion, had it for a couple years. Just hesitates sometimes from a stop, sometimes dies. Hesitates 25% of the time or less and dies 5% or less.

I started looking at the electrical components on the hpop side of things. Disconnected the ICP, no change. My WAG is the IPR, but this is only a guess. The vehicle is my wife's, so not my daily driver. Some how the IPR is not sensing the oil pressure change or the IPR is bleeding off a small amount of oil pressure during acceleration.

I believe it is on the HPOP side so if not the IPR, my next step is going after the HPOP pump.

I had to replace an IPR on the F350, but it wouldn't even start until it was replaced.
The IPR is a possibility, as it is responsible for the actual hpop pressure. The IPR doesn't sense the pressure, but builds the HPOP pressure by cycling closed, which doesn't allow the oil to bleed down. If the solenoid is loose, the idle will be affected similar to what you describe. You can check the "cheap stamped tin nut" that holds the solenoid on, making sure it is tight. Also, if the plunger inside the IPR is sticking, pressure will be affected. RT has a write-up on overhauling the IPR.
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99.5 PS CC 4x4 SRW ZF-6
Triple Pillar Gauges; Fuel pres, Pyro, Boost
AE, Alldatadiy, and half a clue
- AKA "The Big White Truck"
______________________________________________
The first part to be thrown at these trucks should be a PSD compatible scanner

PM please. No Visitor Msg if you want a response anytime soon
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