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Equipment & Gear => Power Equipment & RV => Topic started by: TommyH on October 15, 2019, 10:47:32 AM

Title: 7.3 Powerstroke Help
Post by: TommyH on October 15, 2019, 10:47:32 AM
Anybody around the NE have a scan tool/code reader for these diesels? Truck just died while driving last week. No smoke out the tailpipe.. Iíve thrown $300 at it replacing parts and instead of giving more money to the parts store, getting its codes read seems like the best plan lol. Iíve replaced the cps, ipr valve, unplugged the icp....  really frustrating!! I need my truck back!
On top of all this I had to be towed home by a Chevy!!!!!!!  :bash: :chuckle: :bash:
Title: Re: 7.3 Powerstroke Help
Post by: jeffitz on October 15, 2019, 11:00:52 AM
Check the fuse for the fuel bowl heater - ECM/PCM is on same circuit -fuel bowl heater corrodes and shorts out so if thats it then just unplug it and replace fuse
Title: Re: 7.3 Powerstroke Help
Post by: TommyH on October 15, 2019, 11:04:43 AM
Check the fuse for the fuel bowl heater - ECM/PCM is on same circuit -fuel bowl heater corrodes and shorts out so if thats it then just unplug it and replace fuse

Fuel bowl plug is/has been unplugged for a couple years.
Title: Re: 7.3 Powerstroke Help
Post by: huntnphool on October 15, 2019, 11:23:31 AM
 Died while driving, BCM.

 Itís inside the drivers front wheel well, Iíd be starting there. :twocents:
Title: Re: 7.3 Powerstroke Help
Post by: RockChuck on October 15, 2019, 11:29:36 AM
Died like you shut the key off or sputtered ran rough and died? Check your valve cover gasket wire harness/plugs. Injector wiring runs through there and they like to melt at the plug
Title: Re: 7.3 Powerstroke Help
Post by: TommyH on October 15, 2019, 11:36:41 AM
Died while driving, BCM.

 Itís inside the drivers front wheel well, Iíd be starting there. :twocents:

BCM? Or IDM? It rained earlier that day also...

Died like you shut the key off or sputtered ran rough and died? Check your valve cover gasket wire harness/plugs. Injector wiring runs through there and they like to melt at the plug

No sputtering or nothing, just was driving along and then had no throttle.. pushed the clutch in and lost power steering and brakes.. put it back into 6th and let the clutch out and had power steering and brakes again as motor was turning. 
Title: Re: 7.3 Powerstroke Help
Post by: jeffitz on October 15, 2019, 11:40:44 AM
Ok then its beyond me - the only time mine has died in 20years / 350,000 miles it was the fuel bowl heater shorted and blew that fuse
Title: Re: 7.3 Powerstroke Help
Post by: huntnphool on October 15, 2019, 11:46:19 AM
Died while driving, BCM.

 Itís inside the drivers front wheel well, Iíd be starting there. :twocents:

BCM? Or IDM? It rained earlier that day also...

Died like you shut the key off or sputtered ran rough and died? Check your valve cover gasket wire harness/plugs. Injector wiring runs through there and they like to melt at the plug

No sputtering or nothing, just was driving along and then had no throttle.. pushed the clutch in and lost power steering and brakes.. put it back into 6th and let the clutch out and had power steering and brakes again as motor was turning.

 Sorry, IDM in the wheel well. They are sealed so I seriously doubt it was rain related. Mine did the same thing once, driving down the highway and it just died, no hiccup or warning of any kind, just died.

 Iíve had the injector harness issue before as well, Iíve never heard of both harnesses going back at the same time, itís typically one side or the other, which will still allow half the engine to run, so I doubt itís the harness.

 Even a fuel issue likely would have given you some sort of warning, a hiccup or surge right before going out.

 My bet is the module, let us know what you find.
Title: Re: 7.3 Powerstroke Help
Post by: RockChuck on October 15, 2019, 11:54:16 AM
Ah yes true on the harness, mine would run but only one side

Is it chipped?
Title: Re: 7.3 Powerstroke Help
Post by: Griiz on October 15, 2019, 12:04:45 PM
Have you checked the camshaft position sensor? I keep one in my glove box as they are known to fail.
Title: Re: 7.3 Powerstroke Help
Post by: TommyH on October 15, 2019, 12:09:23 PM
Ok then its beyond me - the only time mine has died in 20years / 350,000 miles it was the fuel bowl heater shorted and blew that fuse

Ya before this happened, the only time mine had died was when the fuel bowl shorted and blew the fuse..

Also I have been stalling on replacing my glow plugs, on cold mornings it takes a few cycles to fire up but always has... usually have a SES light turn on following cold/hard start that will eventually turn off after I drive 5-10 minutes.... gutless while the light is on but as soon as it turns off you can feel full power come back. I was hoping the SES light and lack of power were due to glow plugs being bad, but not sure a bad glow plug or 2 would throw the SES light...? Also didnít think my glow plug issues would effect the truck for 10-15 minutes after it was running..  so that had me thinking possible bad injector or O-ring...?  I think these are unrelated to my no start/no smoke out the pipe issues but not 100% sure especially if itís an injector....???
Title: Re: 7.3 Powerstroke Help
Post by: Fl0und3rz on October 15, 2019, 12:11:23 PM
If it's OBDII, I have a scanner you can borrow if it is nearby.
Title: Re: 7.3 Powerstroke Help
Post by: TommyH on October 15, 2019, 12:14:29 PM
Have you checked the camshaft position sensor? I keep one in my glove box as they are known to fail.

Yes I started with replacing that first as it was the cheapest and known to fail.  But (I knew better) I didnít buy the OEM and picked up one from autozone...
Title: Re: 7.3 Powerstroke Help
Post by: huntnphool on October 15, 2019, 12:23:24 PM
Ok then its beyond me - the only time mine has died in 20years / 350,000 miles it was the fuel bowl heater shorted and blew that fuse

Ya before this happened, the only time mine had died was when the fuel bowl shorted and blew the fuse..

Also I have been stalling on replacing my glow plugs, on cold mornings it takes a few cycles to fire up but always has... usually have a SES light turn on following cold/hard start that will eventually turn off after I drive 5-10 minutes.... gutless while the light is on but as soon as it turns off you can feel full power come back. I was hoping the SES light and lack of power were due to glow plugs being bad, but not sure a bad glow plug or 2 would throw the SES light...? Also didnít think my glow plug issues would effect the truck for 10-15 minutes after it was running..  so that had me thinking possible bad injector or O-ring...?  I think these are unrelated to my no start/no smoke out the pipe issues but not 100% sure especially if itís an injector....???

 How many miles? Itís likely injector time. ;)

 Does it fire right up if plugged in at night?
Title: Re: 7.3 Powerstroke Help
Post by: TommyH on October 15, 2019, 12:27:03 PM
Ok then its beyond me - the only time mine has died in 20years / 350,000 miles it was the fuel bowl heater shorted and blew that fuse

Ya before this happened, the only time mine had died was when the fuel bowl shorted and blew the fuse..

Also I have been stalling on replacing my glow plugs, on cold mornings it takes a few cycles to fire up but always has... usually have a SES light turn on following cold/hard start that will eventually turn off after I drive 5-10 minutes.... gutless while the light is on but as soon as it turns off you can feel full power come back. I was hoping the SES light and lack of power were due to glow plugs being bad, but not sure a bad glow plug or 2 would throw the SES light...? Also didnít think my glow plug issues would effect the truck for 10-15 minutes after it was running..  so that had me thinking possible bad injector or O-ring...?  I think these are unrelated to my no start/no smoke out the pipe issues but not 100% sure especially if itís an injector....???

 How many miles? Itís likely injector time. ;)

 Does it fire right up if plugged in at night?

Yes if plugged in it fires up great. Well it did before this...
Title: Re: 7.3 Powerstroke Help
Post by: huntnphool on October 15, 2019, 12:28:45 PM
Ok then its beyond me - the only time mine has died in 20years / 350,000 miles it was the fuel bowl heater shorted and blew that fuse

Ya before this happened, the only time mine had died was when the fuel bowl shorted and blew the fuse..

Also I have been stalling on replacing my glow plugs, on cold mornings it takes a few cycles to fire up but always has... usually have a SES light turn on following cold/hard start that will eventually turn off after I drive 5-10 minutes.... gutless while the light is on but as soon as it turns off you can feel full power come back. I was hoping the SES light and lack of power were due to glow plugs being bad, but not sure a bad glow plug or 2 would throw the SES light...? Also didnít think my glow plug issues would effect the truck for 10-15 minutes after it was running..  so that had me thinking possible bad injector or O-ring...?  I think these are unrelated to my no start/no smoke out the pipe issues but not 100% sure especially if itís an injector....???

 How many miles? Itís likely injector time. ;)

 Does it fire right up if plugged in at night?

Yes if plugged in it fires up great. Well it did before this...

 If the injectors have not been replaced it sounds time. :twocents:
Title: Re: 7.3 Powerstroke Help
Post by: TommyH on October 15, 2019, 12:35:04 PM
220k. When I bought it @ 195k the guy had said the injectors had been tested and new orings.. but no paperwork to confirm that.

Ah yes true on the harness, mine would run but only one side

Is it chipped?

Not chipped... yet. Plan to tho.
Title: Re: 7.3 Powerstroke Help
Post by: RockChuck on October 15, 2019, 12:41:41 PM
https://www.ford-trucks.com/forums/forum170/

Maybe I missed the year but this site seems to have a lot of good info
Title: Re: 7.3 Powerstroke Help
Post by: TommyH on October 15, 2019, 01:11:16 PM
https://www.ford-trucks.com/forums/forum170/

Maybe I missed the year but this site seems to have a lot of good info

Itís a 99.
Thanks everyone for the replies, Iíd really like to get this back on the road! Itís hunting season!
Title: Re: 7.3 Powerstroke Help
Post by: spoonman on October 15, 2019, 01:41:49 PM
Have you checked the camshaft position sensor? I keep one in my glove box as they are known to fail.


👆
Title: Re: 7.3 Powerstroke Help
Post by: TommyH on October 15, 2019, 01:46:06 PM
Have you checked the camshaft position sensor? I keep one in my glove box as they are known to fail.

Yes I started with replacing that first as it was the cheapest and known to fail.  But (I knew better) I didnít buy the OEM and picked up one from autozone...

Yes that was my first purchase.
Title: Re: 7.3 Powerstroke Help
Post by: huntnphool on October 15, 2019, 02:31:09 PM
220k. When I bought it @ 195k the guy had said the injectors had been tested and new orings.. but no paperwork to confirm that.

Ah yes true on the harness, mine would run but only one side

Is it chipped?

Not chipped... yet. Plan to tho.

 Tested is not the same as replaced. My money is on your injectors as to why itís difficult to start when cold. ;)
Title: Re: 7.3 Powerstroke Help
Post by: jeffitz on October 15, 2019, 02:58:09 PM
Mine was a joke to start cold until i replaced injectors - now its good as new.
Title: Re: 7.3 Powerstroke Help
Post by: jackelope on October 15, 2019, 03:06:54 PM
Where are you located?
Title: Re: 7.3 Powerstroke Help
Post by: longshaft on October 15, 2019, 03:13:32 PM
Crankshaft position sensor it will shut your truck off like you turn the key off I have been through this twice
Title: Re: 7.3 Powerstroke Help
Post by: jackelope on October 15, 2019, 03:16:11 PM
Crankshaft position sensor it will shut your truck off like you turn the key off I have been through this twice

He's already replaced it.

Also there are multiple potential causes for this. You could diagnose the problem and replace the failed part or you could throw parts at it till you fix it.

Profile says eastside. If that's east side of the mountains, I can't help. If that's eastside like Bellevue Redmond etc I can probably help. Shoot me a message.
Title: Re: 7.3 Powerstroke Help
Post by: RockChuck on October 15, 2019, 03:20:24 PM
I think he said NE wa earlier
Title: Re: 7.3 Powerstroke Help
Post by: jackson7 on October 15, 2019, 03:24:22 PM
Sob, just wrote and for some reason did not post.
Had a similar issue with shutting off and glow plugs. Also my mileage dipped.
Replaced the cam position sensor with a non OEM. It helped but would still happen once in a while. Always wondered if it were to happen at high speed. Once shut down as i am crossing a creek bed on a wooden bridge. Scared the heck out of me as, it was all ice. I got lucky.
Replaced with an OEM sensor and no problems since. Good luck.Let us know how it turns out.
Title: Re: 7.3 Powerstroke Help
Post by: jackelope on October 15, 2019, 04:38:34 PM
I think he said NE wa earlier

Ya...just have to slow down and read. Thanks.
Title: Re: 7.3 Powerstroke Help
Post by: slowhand on October 15, 2019, 06:07:03 PM
Put 5 gallons of diesel in each tank. Very possible your out of fuel or the tank didnít switch. Cheap and very very possible
Title: Re: 7.3 Powerstroke Help
Post by: TommyH on October 15, 2019, 07:45:54 PM
Put 5 gallons of diesel in each tank. Very possible your out of fuel or the tank didnít switch. Cheap and very very possible


Only one tank, no switch.. and itís got fuel, 15 gallons in the tank and the fuel bowl was full. It full of oil and the hpop is as well. No smoke out the exhaust at all so itís not ďworkingĒ the injectors for one reason or another...  new cps, new ipr valve, unplugged the icp sensor which is supposed to reset it to a factory setting allowing it to run when unplugged.
 So as far as *I know* or suggested by others, the remaining possibilities (that I think could be likely) is the - 1.  IDM,   2. high pressure oil pump (hpop),   3. injectors.. (thought I watched a YouTube video saying a bad o-ring prevented enough pressure from building for injectors to work???. 4. CPS, I bought one from autozone it may be junk but I got rpms on the tach when cranking  (indicates cps is working) and rpms 200ish on digital AICM  http://dieselinnovations.com/techfiles/aic_manual1.pdf
5...? I donít know let me know if Iím over looking something.

I know the UVCH is a known problem but I donít think both failed at the same time, if one was bad I think it would still fire the injectors on the good bank..? And would run and still make smoke out the exhaust..
The icp I didnít inspect for oil on the plug very well (indicating itís leaking and bad) but unplugging it is supposed to allow it to run.

My diagnosis abilities are run out now lol hopefully someone can chime in with some insight. I am hoping I donít have to have it towed to a the shop but may have to... Thanks all to replied. I appreciate it. Keep em coming.
Title: Re: 7.3 Powerstroke Help
Post by: RockChuck on October 15, 2019, 08:53:10 PM
https://doc-14-24-docs.googleusercontent.com/docs/securesc/ha0ro937gcuc7l7deffksulhg5h7mbp1/b685llm7cfaams712umoa886611i6fbv/1571191200000/02435144570958117808/*/0Byb4NbQJIHUPY2x4WU1qRU1VVGc?e=download
Title: Re: 7.3 Powerstroke Help
Post by: RockChuck on October 15, 2019, 09:03:21 PM
That link above may not work but this page  has a link to it a little ways down, I know itís 96 but there is a good flow chart on no starts

https://www.ford-trucks.com/forums/1599601-96-7-3l-crank-but-no-start.html


It has clickable links on test procedures also
Title: Re: 7.3 Powerstroke Help
Post by: TommyH on October 20, 2019, 05:43:11 PM
So I havenít had much time to mess with my truck but had a relative come out with a snap on scanner, itís got a few codes but Iím not sure that any are telling me exactly what I need... (or that I understand enough)
Codes we got were - * P1316 IDM codes detected. * PO340 cam position sensor circuit fault.  Buzz test codes were, *P1277, *P1293 high side open (right) *P1294 high side open (left).  Still uncertain which part(s) are the culprit... Iím still leaning twords the IDM...? Any more input from anyone more knowledgeable than myself??????
Title: Re: 7.3 Powerstroke Help
Post by: Stump on October 20, 2019, 06:58:58 PM
Sure sounds like the cam sensor,  I also keep a spair in the glove box with a 10 mm wrench.
Title: Re: 7.3 Powerstroke Help
Post by: jackelope on October 20, 2019, 08:51:11 PM
Sure sounds like the cam sensor,  I also keep a spair in the glove box with a 10 mm wrench.

Heís getting RPMís when cranking so that indicates the CPS is working.
Title: Re: 7.3 Powerstroke Help
Post by: huntnphool on October 20, 2019, 09:47:05 PM
Sure sounds like the cam sensor,  I also keep a spair in the glove box with a 10 mm wrench.

Heís getting RPMís when cranking so that indicates the CPS is working.

  :yeah:

 Clearly has injector issues as well, but those wonít cause it to die without warning.
 
 Injectors, new harnesses and gaskets will likely clear most of those codes, but still have to figure out why it died and wonít start.
Title: Re: 7.3 Powerstroke Help
Post by: TommyH on October 20, 2019, 10:31:36 PM
Sure sounds like the cam sensor,  I also keep a spair in the glove box with a 10 mm wrench.

Heís getting RPMís when cranking so that indicates the CPS is working.

  :yeah:

 Clearly has injector issues as well, but those wonít cause it to die without warning.
 
 Injectors, new harnesses and gaskets will likely clear most of those codes, but still have to figure out why it died and wonít start.

Yes, new gaskets/harnesses, glow plugs are on the ďto doĒ list.  Injector(s) work or replacement more than likely added to that list... not sure if it is, or is not the cause of the no start issues.??  Iím going to try my IDM on another running 99 and try to rule it out...thanks @huntnfool  @jackelope and  others.
Title: Re: 7.3 Powerstroke Help
Post by: jackson7 on October 20, 2019, 11:08:22 PM
I don't know if there is a link. Posted once before. Truck would shut off and trouble starting once we got into the 30's. 1st went with non oem cam position sensor. it helped but would still happen occasionally.
Changed to oem sensor and no issues since . This was last year. Starts now when temp dips into the 20's and no more turning off. Mine is a 2000 f250.
Also had my mileage drop from 16.4 to 16.0mpg. Haven't had it on road much to check mileage as only use during hunting season w camper. Will let you know after a few trips.
Good luck.
Title: Re: 7.3 Powerstroke Help
Post by: stw on October 21, 2019, 05:01:44 AM
I have a 97 7.3  it did the same thing run  tell it got warm then after warning up it would shut off and wouldn't start  it was the ipr. Valve was bad . And if the truck is low on oil it won't start the 7.3s run off oil pressure .
Title: Re: 7.3 Powerstroke Help
Post by: RockChuck on October 21, 2019, 05:56:42 AM
You said it happend after driving around in the rain? The idm on your superduty is behind the fender I believe so it is very possible it got wet (sure itís sealed good but seals can go bad) and went bad. Hope you get it working soon.
Title: Re: 7.3 Powerstroke Help
Post by: MR5x5 on October 21, 2019, 03:24:32 PM
Smartest 7.3 folks on the planet live here.

https://www.ford-trucks.com/forums/forum31/
Title: Re: 7.3 Powerstroke Help
Post by: Mudman on October 21, 2019, 03:56:33 PM
I would not be surprised if bad fuel went through inj and now they are junk.  I had that with my 2001.  Multiple codes were firing up as well.  Are ya running aftermarket quality 2micron filters?  If so then ignore me.
Title: Re: 7.3 Powerstroke Help
Post by: TommyH on October 21, 2019, 04:58:05 PM
I looked again at the pics I took of the scan tool, I also had a P1280 code. ICP circut our of range low.
Title: Re: 7.3 Powerstroke Help
Post by: 95powersmoker on October 22, 2019, 08:51:15 AM
I looked again at the pics I took of the scan tool, I also had a P1280 code. ICP circut our of range low.

Wouldn't focus on that. Likely got that code when you tried running it without the ICP sensor plugged in. I would have cleared the codes and then tried to start it again and checked once more for codes. Also, would be ideal if you could get ICP psi # and IPR duty cycle %. Need to know if you are getting enough high pressure oil to fire injectors.

Title: 7.3 Powerstroke Help
Post by: dyhardhuntr on October 22, 2019, 09:07:08 AM
You need to check ipr percentage and see if the icp sensor is reading any psi. If your ipr percentage goes way up ( such as 80% or higher) then you have an internal leak somewhere. Normal % is around 25-35 to start up. Also you are looking at more than 500 psi from your icp for start up. On the scanner you should see desired and actual. If those are both good I would lean towards an ecm. All of your injectors donít just fail. Iíve seen bad fuel go thru injectors multiple times. Iíve had this same thing happen with a bad ipr valve. That is what helps build psi in the hpop system. Donít just throw parts at it. It gets expensive real quick. Especially with a diesel. Try not to crank the engine more than 30 seconds at a time with a few minute cool down. Youíll be putting a starter in it too.


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Title: Re: 7.3 Powerstroke Help
Post by: TommyH on October 22, 2019, 07:23:15 PM
I (we) seen the ipr and icp and thought they were both ok. But I could be missing something...? I need to pull the valve cover and check plug and harness. Iíll probably replace them while Iím in there, plan on doing glow plugs. Iíve been thinking itís the IDM. Testing one here in the next few days from a buddies truck.
Title: Re: 7.3 Powerstroke Help
Post by: TommyH on October 22, 2019, 08:15:15 PM
I looked again at the pics I took of the scan tool, I also had a P1280 code. ICP circut our of range low.

Wouldn't focus on that. Likely got that code when you tried running it without the ICP sensor plugged in. I would have cleared the codes and then tried to start it again and checked once more for codes. Also, would be ideal if you could get ICP psi # and IPR duty cycle %. Need to know if you are getting enough high pressure oil to fire injectors.
We did clear them and ran again, I think thatís why I missed this code from pics because i think it was gone after the second go around. :tup:
Title: Re: 7.3 Powerstroke Help
Post by: dyhardhuntr on October 22, 2019, 08:31:44 PM
That icp seems unusual to me. Thatís normally what you would see if you dead headed the high psi oil pump. You want to see over 500 while cranking. 725 is ideal but 2554 psi does not seem right. Your ipr looks fine. If you clear all the codes do any come back while cranking?
Title: Re: 7.3 Powerstroke Help
Post by: TommyH on October 22, 2019, 08:49:52 PM
You need to check ipr percentage and see if the icp sensor is reading any psi. If your ipr percentage goes way up ( such as 80% or higher) then you have an internal leak somewhere. Normal % is around 25-35 to start up. Also you are looking at more than 500 psi from your icp for start up. On the scanner you should see desired and actual. If those are both good I would lean towards an ecm. All of your injectors donít just fail. Iíve seen bad fuel go thru injectors multiple times. Iíve had this same thing happen with a bad ipr valve. That is what helps build psi in the hpop system. Donít just throw parts at it. It gets expensive real quick. Especially with a diesel. Try not to crank the engine more than 30 seconds at a time with a few minute cool down. Youíll be putting a starter in it.

Ecm = IDM ?

 :tup:   ICP pressure @2554 indicates hpop is fine correct...? IPR % at 39 while cranking, so assuming itís ok, (and *new* but Napa parts, CPS was autozone,)  Iím left thinking my ipr (new) is working, cps is new (autozone) hpop is making pressure according it icp....? Iím leaning to IDM failure.?
 Uvch/gaskets would only be one bank or another, Iíd have smoke out the tailpipe, and injectors injecting on one bank. Not a die while driving, not a no smoke out the pipe, and most likely would run, even on four injectors working.

???
Title: Re: 7.3 Powerstroke Help
Post by: dyhardhuntr on October 22, 2019, 08:55:29 PM
Your ipr is fine but if the icp goes straight to 2554 while cranking that does not seem right. It should be around 725. 2550 should be the max if that pump was dead headed. If there is no smoke from the exhaust then there is no fuel being injected into the cylinder. You can try swapping your buddies IDM. Try swapping the icp also. See what happens.
Title: Re: 7.3 Powerstroke Help
Post by: jackelope on October 22, 2019, 09:07:03 PM
IDM is injector driver module.

ECM is really a PCM with Ford. Powertrain control module.
Title: Re: 7.3 Powerstroke Help
Post by: TommyH on October 22, 2019, 09:48:43 PM
You said it happend after driving around in the rain? The idm on your superduty is behind the fender I believe so it is very possible it got wet (sure itís sealed good but seals can go bad) and went bad. Hope you get it working soon.

Iím leaning to this being the case.. but Iíve been wrong before,  Iíll try swapping another IDM, Iíve read any 99-02(03)? iDM will work. Is that ďwill workĒ and allow it to run but not run right compared to if equipped with the correct IDM???  Iíll be Trying a 01 IDM in a 99.
Title: Re: 7.3 Powerstroke Help
Post by: TommyH on October 22, 2019, 09:59:52 PM
Your ipr is fine but if the icp goes straight to 2554 while cranking that does not seem right. It should be around 725. 2550 should be the max if that pump was dead headed. If there is no smoke from the exhaust then there is no fuel being injected into the cylinder. You can try swapping your buddies IDM. Try swapping the icp also. See what happens.

Thanks, this maybe something I need to look into more. I thought I had read the psi will continue to increase as it turns over...? At the start of the video I took of the scan tool ICP psi was at 2500 ish.. it could have been a few seconds into cranking.? Any ideas of why a high psi while cranking would occur?
Title: Re: 7.3 Powerstroke Help
Post by: TommyH on October 22, 2019, 10:10:36 PM
I am getting a ďwait to start lightĒ meaning ? communication with the pcm I think..(pcm and wait to start light on same fuse and also fuel bowl heater that I previously 2 years ago unplugged)  I donít know if communication - ď wait to startĒ equals proper functionality...?
Title: Re: 7.3 Powerstroke Help
Post by: huntnphool on October 23, 2019, 01:02:42 AM
 You are putting the cart in front of the horse. Swap the IDM and go from there. :twocents:
Title: Re: 7.3 Powerstroke Help
Post by: dyhardhuntr on October 23, 2019, 07:28:47 AM
Your icp will climb while cranking but not to 2554. The desired and or default(if there is an issue) is 725 psi. Thatís at idle. 2554psi would be at high idle or max rpm. If it was running there should be an option under functional tests to check the output of the pump. It is a step test where you close the ipr and it dead heads the pump. The icp should show what kind of psi the pump is putting out. Also the best way to see if the icp is reading correctly is to put a gauge capable of 3,000 psi in place of the icp. Only then will you know what your psi is cutting out all electronics. Take your icp sensorinto a hydraulic hose store. You should be able to get the hose, fitting and gauge for under $50. Of while cranking your reading 725 psi on the gauge but the scanner said 2554 youíve narrowed your issue to the icp sensor/wiring.
Title: Re: 7.3 Powerstroke Help
Post by: Boss .300 winmag on October 23, 2019, 08:04:46 AM
🤔
Title: Re: 7.3 Powerstroke Help
Post by: TommyH on November 02, 2019, 09:02:11 AM
So, got the IDM swapped out yesterday and my truck is alive again! I still have the same issues (pre IDM failure), SES light came on after 5-10 minutes of idling. The SES light has always turned off after a short drive and truck regains full power. Iím pretty sure i have some glow plug problems and suspect some injector issues as well. (P1277 cylinder 7 (c) high to low side open)...
before I plugged the new IDM in I did this recommended test. https://system.na1.netsuite.com/core/media/media.nl?id=609394&c=744110&h=a78527245dc5a18cb805&_xt=.pdf

On test one (from link) Ohms were supposed to read between 2.8 and 3.6, test 1 procedure 1-4 tests drivers side bank, 5-8 tests passenger side. These were read from the IDM plug.
Hereís the ohm readings I got from drivers side bank.
On Pins 23 and 22 = 4
Pins 23 and 7 =7.8
Pins 23 and 19 =7.1
Pins 23 and 9 =4.2
Passenger side were all between 3.2 and 3.5.
The high readings (drivers side) of 7.8 and 7.1 were from injectors 4 and 6. Anybody have more insight on what these higher resistance readings indicate? Possible injector solenoids..?
From the link-
INJECTOR RESISTANCE + WIRING TESTFaulty electrical wiring between the injectors and IDM can be an issue with the Ford 7.3L Power Stroke engine. To determine whether the wiring between the injectors and IDM is within specifcation and that there are no open or short circiuts, measure the resistance (ohms) of the complete power output and ground cir-cuit. Measuring the resistance will also determine whether you have defective injector solenoid(s). You can see where the wiring is connected into both styles of wiring harnesses (model years 1994 - 1998 and model years 1999 - 2003) below.