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7.3 powerstroke help #7243600
04/14/21 08:54 PM
04/14/21 08:54 PM
Joined: Dec 2006
Posts: 8,104
Piney va. soon be 19
cotton Offline OP
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cotton  Offline OP
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Piney va. soon be 19
2000 f-350 7..3
went to town and it was running fine, one time on the way it ran rough for just a bit.
went to wallyworld, and got our stuff. started back home and truck started running real rough and was lossing power. got to thinking fuel filter was stopped up and went to parts store and put one on it.
motor was really hammering bad cut it off and waited a bit the started it back up and tried to pull out of parking spot, no go no power and was hammering worse. call two truck and now i am trying to figure this out.
took filter cap off and had wife turn key on so could see if getting fuel to the bowl, filled up and overran in a few seconds. been told is maybe injector pump and/or injectors.


John 3/16

ifin your gonna be dumb ya gotta be tough
VTA life member

Re: 7.3 powerstroke help [Re: cotton] #7243604
04/14/21 08:59 PM
04/14/21 08:59 PM
Joined: Oct 2011
Posts: 2,786
Western Shore Delaware
SJA Offline
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SJA  Offline
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Joined: Oct 2011
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Western Shore Delaware
Was she "jumping"? Did you bleed the fuel line? How low was the fuel BEFORE you filled up? . . . one other question, did you smell anything burning?

Last edited by SJA; 04/14/21 09:03 PM.

"Humans are the hardest people to get along with."
Dr. Phillip Snow
Re: 7.3 powerstroke help [Re: cotton] #7243609
04/14/21 09:02 PM
04/14/21 09:02 PM
Joined: Dec 2006
Posts: 8,104
Piney va. soon be 19
cotton Offline OP
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cotton  Offline OP
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Piney va. soon be 19
3/4 tank of fuel in it, was filled up the day before, fuel looks clean and dry.
jumped some for sure


John 3/16

ifin your gonna be dumb ya gotta be tough
VTA life member

Re: 7.3 powerstroke help [Re: cotton] #7243613
04/14/21 09:07 PM
04/14/21 09:07 PM
Joined: Oct 2011
Posts: 2,786
Western Shore Delaware
SJA Offline
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SJA  Offline
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Western Shore Delaware
If you lost "go power" when in gear, possibly a tranny problem. Had a similar sounding problem in a '99 F250.

Last edited by SJA; 04/14/21 09:09 PM.

"Humans are the hardest people to get along with."
Dr. Phillip Snow
Re: 7.3 powerstroke help [Re: cotton] #7243614
04/14/21 09:11 PM
04/14/21 09:11 PM
Joined: Oct 2011
Posts: 2,417
Idaho
B
bearcat2 Online content
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Idaho
Likely injectors. A little tip for a cheap fix. Take the valve covers off, on top of the injector there is a poppet screw. This has a funky looking head like a reverse torx head, I can't remember the actual name of it, but it is often called a "Nintendo screw" because apparently the only thing that uses them are Powerstroke injectors and Japanese video games. It can be a bit of a pain to find a bit to fit it, probably have to order it, or you can grind the walls of 4.5mm socket real thin so they fit in the recess and sometimes get enough of bite with them to tighten the screw. But these screws have a habit of backing off when the injectors get some mileage on them, and when they do the injector doesn't pump fuel. tighten those down and it will inject fuel again. Had to do this to several of my injectors a couple times on my 94 7.3 It'll run on 7 cylinders, just a little rough and losing a little power, on six it gets great fuel mileage but it doesn't hardly have enough power to climb a hill and is real rough. Let me tell you on five cylinders it will about rattle you right out of the cab, and that is if you can get it to start!

A $.50 bit to tighten them poppet screws is a lot cheaper than $1500 for new injectors.

Re: 7.3 powerstroke help [Re: cotton] #7243621
04/14/21 09:17 PM
04/14/21 09:17 PM
Joined: Oct 2011
Posts: 2,786
Western Shore Delaware
SJA Offline
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SJA  Offline
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Western Shore Delaware
Sorry BC2, can't resist . . . "but it is often called a "Nintendo screw" because apparently the only thing that uses them are Powerstroke injectors and Japanese video games.

Is that the same thing as a knuter valve? crazy


"Humans are the hardest people to get along with."
Dr. Phillip Snow
Re: 7.3 powerstroke help [Re: cotton] #7243625
04/14/21 09:27 PM
04/14/21 09:27 PM
Joined: Jan 2019
Posts: 381
Southern Ohio
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Ohiowoodchuck Offline
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Southern Ohio
Check the plug ins under the valve covers. The original design of the plug ins were notorious for coming unplugged just a bit and loosing a whole bank of cylinders. Also check the plug ins on the outside of the valve covers also. The 99-03 trucks have a high pressure oil pump that relies on high pressure oil to fire each injector. Also check the oil level and let me know if it has went up on the dipstick. Check those items outs and report back and we can go from there.


“If there must be trouble, let it be in my day, that my child may have peace.”
— Thomas Paine
Re: 7.3 powerstroke help [Re: Ohiowoodchuck] #7243644
04/14/21 09:46 PM
04/14/21 09:46 PM
Joined: Feb 2021
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Wisconsin
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Mad Scientist Offline
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Wisconsin
The valve cover gaskets have wires running thru it for glow plugs and injectors or plug ins could be bad.$50.00 per side at rockauto

Re: 7.3 powerstroke help [Re: Mad Scientist] #7243653
04/14/21 09:53 PM
04/14/21 09:53 PM
Joined: Jul 2011
Posts: 1,300
Custer SD
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arcticotter Offline
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Custer SD
Originally Posted by Mad Scientist
The valve cover gaskets have wires running thru it for glow plugs and injectors or plug ins could be bad.$50.00 per side at rockauto


This

Re: 7.3 powerstroke help [Re: cotton] #7243662
04/14/21 10:00 PM
04/14/21 10:00 PM
Joined: Jun 2018
Posts: 4,739
Beatrice, NE
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loosegoose Offline
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Beatrice, NE
Diesels are such wonderful fun. First things first......don't start replacing things on a hunch, that'll get really expensive really fast. Dish it properly, and replace what's broke. You'll need proper tools, including a scan tool, to dish it properly. Check fuel pressure from the left pump, and check fuel pressure in the high pressure system....you'll need a scan tool for that. If it runs fine after sitting a while and gets progressively worse, you may have a torn o-ring on a fuel injector. It's a bit of a process to figure that out though. If it runs like crap when cold but gets better as it warms up, you may have a "sticktion" issue. They get gooped up, and there are various lotions and potions that you can run in your oil to try to fix it, the best did is to replace all the injectors though. You'll need a scan tool to perform a "buzz test", it clicks each injector and you can tell by the sound if they're okay or not.

Re: 7.3 powerstroke help [Re: Ohiowoodchuck] #7243663
04/14/21 10:00 PM
04/14/21 10:00 PM
Joined: Dec 2006
Posts: 8,104
Piney va. soon be 19
cotton Offline OP
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cotton  Offline OP
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Piney va. soon be 19
Originally Posted by Ohiowoodchuck
Check the plug ins under the valve covers. The original design of the plug ins were notorious for coming unplugged just a bit and loosing a whole bank of cylinders. Also check the plug ins on the outside of the valve covers also. The 99-03 trucks have a high pressure oil pump that relies on high pressure oil to fire each injector. Also check the oil level and let me know if it has went up on the dipstick. Check those items outs and report back and we can go from there.

will check it out in the morning

thanks guys


John 3/16

ifin your gonna be dumb ya gotta be tough
VTA life member

Re: 7.3 powerstroke help [Re: Ohiowoodchuck] #7243672
04/14/21 10:09 PM
04/14/21 10:09 PM
Joined: Oct 2011
Posts: 2,417
Idaho
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bearcat2 Online content
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Idaho
Originally Posted by Ohiowoodchuck
Check the plug ins under the valve covers. The original design of the plug ins were notorious for coming unplugged just a bit and loosing a whole bank of cylinders. Also check the plug ins on the outside of the valve covers also. The 99-03 trucks have a high pressure oil pump that relies on high pressure oil to fire each injector. Also check the oil level and let me know if it has went up on the dipstick. Check those items outs and report back and we can go from there.


I never had that problem personally, but that is why I first pulled the valve covers. Heard of lots of people having that problem. When you pull the valve covers check both the plug ins and the poppet screws.

If the oil level goes up. Don't drive it! It is dumping either diesel or antifreeze in the oil.

Re: 7.3 powerstroke help [Re: bearcat2] #7243680
04/14/21 10:17 PM
04/14/21 10:17 PM
Joined: Jan 2019
Posts: 381
Southern Ohio
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Ohiowoodchuck Offline
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Ohiowoodchuck  Offline
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Southern Ohio
Originally Posted by bearcat2
Originally Posted by Ohiowoodchuck
Check the plug ins under the valve covers. The original design of the plug ins were notorious for coming unplugged just a bit and loosing a whole bank of cylinders. Also check the plug ins on the outside of the valve covers also. The 99-03 trucks have a high pressure oil pump that relies on high pressure oil to fire each injector. Also check the oil level and let me know if it has went up on the dipstick. Check those items outs and report back and we can go from there.


I never had that problem personally, but that is why I first pulled the valve covers. Heard of lots of people having that problem. When you pull the valve covers check both the plug ins and the poppet screws.

If the oil level goes up. Don't drive it! It is dumping either diesel or antifreeze in the oil.

I’m wondering what you are calling the poppet screw. The only screws I’m aware of are the four that holds the solenoid to the injector. Then there is the small bolt that holds the oil deflector on. Are you talking about the four screws under the solenoid that hold the injector body together? Maybe it was just on the 94 model trucks. I’ve had several of the 99-03 trucks and I swore I’d never buy another one of the junk pos but low and behold I got a good deal on a 96 crew cab long bed 4x4 so I’ll be in the same boat again.

Last edited by Ohiowoodchuck; 04/14/21 10:54 PM.

“If there must be trouble, let it be in my day, that my child may have peace.”
— Thomas Paine
Re: 7.3 powerstroke help [Re: cotton] #7243700
04/14/21 10:37 PM
04/14/21 10:37 PM
Joined: Dec 2006
Posts: 11,895
Oakland, MS
Drifter Offline
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Oakland, MS
Low on oil will shut em down as well. Those valve cover gaskets suck and go south when unplugged part way from arcing.


Some individuals use statistics as a drunk man uses lamp-posts — for support rather than for illumination.

Andrew Lang (1844-1912) Scottish poet, novelist and literary critic









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Re: 7.3 powerstroke help [Re: cotton] #7243715
04/14/21 10:50 PM
04/14/21 10:50 PM
Joined: Nov 2014
Posts: 1,367
Texas
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jtg Offline
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Texas
On top of the motor block there is a yellow valve handle to drain water. I would try that first.

Re: 7.3 powerstroke help [Re: Drifter] #7243722
04/14/21 10:58 PM
04/14/21 10:58 PM
Joined: Jan 2019
Posts: 381
Southern Ohio
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Ohiowoodchuck Offline
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Originally Posted by Drifter
Low on oil will shut em down as well. Those valve cover gaskets suck and go south when unplugged part way from arcing.

Ive had it happen on everyone of the 7.3’s I’ve owned. International/Ford re-engineered the new ones to solve this problem. The last set I bought was about 85.00 a side buts it’s been a few years. Never tried the aftermarket ones.


“If there must be trouble, let it be in my day, that my child may have peace.”
— Thomas Paine
Re: 7.3 powerstroke help [Re: cotton] #7243755
04/14/21 11:41 PM
04/14/21 11:41 PM
Joined: Jun 2008
Posts: 3,716
SW Pa
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wr otis Offline
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SW Pa
Have somebody turn key on while you listen to the injectors cycle. If one side cycles and the other side is quiet, then the quiet side has come un plugged.

Happened to mine two weeks ago. My driver's side was shut off, driver's side is the easier of the two to fix.

Gaskets you can get at napa or advance, with wires or without.

Re: 7.3 powerstroke help [Re: cotton] #7243774
04/15/21 12:41 AM
04/15/21 12:41 AM
Joined: Mar 2013
Posts: 160
Interior Alaska
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GUK Offline
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Interior Alaska
Change the oil, new oil and filter. Power stroke is a HEUI engine. It uses high pressure oil to accomplish the injection. Dirty oil and they will run rough. May not solve the problem, it many times it does. Get a infrared thermometer and look at the exhaust manifold runners where they bolt to head. A bad/not firing injector will show cold compared to a properly running cylinder. Same can be done with welders heat chalk on the runners. 250’degree chalk will work. Try to identify where the problem is before tearing things apart.


GUK.....it's the sound they make when they hit the end of the cable
Re: 7.3 powerstroke help [Re: GUK] #7243788
04/15/21 04:29 AM
04/15/21 04:29 AM
Joined: Jan 2011
Posts: 529
NE Mississippi
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GRP Offline
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Originally Posted by GUK
Change the oil, new oil and filter. Power stroke is a HEUI engine. It uses high pressure oil to accomplish the injection. Dirty oil and they will run rough. May not solve the problem, it many times it does. Get a infrared thermometer and look at the exhaust manifold runners where they bolt to head. A bad/not firing injector will show cold compared to a properly running cylinder. Same can be done with welders heat chalk on the runners. 250’degree chalk will work. Try to identify where the problem is before tearing things apart.

I have a 2000 7.3. Lost track of miles hauling hay in last fall. Started knocking and acting up. Checked shop books and it was way overdue. Changed oil, doing perfect again. Also, I use nothing but Rotella 15w40.


For by grace are you saved by faith, and not of yourselves, it is the gift of God.
Re: 7.3 powerstroke help [Re: cotton] #7243795
04/15/21 05:08 AM
04/15/21 05:08 AM
Joined: Jun 2016
Posts: 13,964
Michigan
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Trapper Dahlgren Offline
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Michigan
mine did this it was the turbo ,

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