Dead cylinder on 2000 7.3

[laserjock]

Asking for a friend.

2000 F250 PSD 6 speed

Buddy of mine had a rough trip to the mountains to meet up with us. About half way the truck died. Wouldn’t start. After a tow and a scan, dealer replaced the injector driver module and sent him on his way. Top of the last mountain it comes up lame. Not enough power to pull itself and the trailer behind it. He coasts it to the bottom of the mountain and comes to find us. Long story short it sounds to me like it’s running on 7. Rhythmic puff of white smoke. Will drag itself at an idle but that’s about it. Tonight he got the code pulled and he sent me this.

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We are thinking maybe broken wire or possibly loose connector under the valve cover.

He fairly recently added a TS programmer, cold air intake and 5” exhaust. I believe that was 600 miles ago.

Any help is appreciated. I know nothing about these but I’m trying to help him out.

Thanks!

 

[79jasper]

If it was unplugged, you would get it saying "open."
I would bet uvch or plug.
Its shutting one bank down.
Do this. http://www.gbreman.com/articles/?p=242

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[IDIoit]

I like running the pins on the IDM.
don't have to disturb the covers unless you have to.
easier to get to with a 4" lift.
I cant wait till I delete the IDM in mine!

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[laserjock]

If it was unplugged, you would get it saying "open."
I would bet uvch or plug.
Its shutting one bank down.
Do this. http://www.gbreman.com/articles/?p=242

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So if I follow that at all, it sounds like something wrong under the valve cover could toast the IDM?? Surely the dealer should have checked that when replacing the IDM right? It seems that a bad wire in the system could hose the new driver. Is that correct?

 

[79jasper]

Pfft, do extra work? Why would they?
It could, but not as common. As I mentioned, it can sense a short and cut power to that side.
Now that's not to say weird things can't happen.
But water is the number one killer of IDM'S.

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[greenskeeper]

I second the notion of a burnt harness under the valve cover.

 

[laserjock]

Update. He ran the procedure above and everything checks out just like it should. Beginning to think the autozone IDM is the culprit. Thoughts on how to confirm that short of swapping it? It was an on the road repair or it probably wouldn’t have been an autozone IDM.

 

[79jasper]

Next suggestion would be to swap cylinder 4 injector with another. See if problem follows.
Were the harness checks done cold or hot?

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[laserjock]

Cold.

 

[79jasper]

I think I would try it warm. Like when the issue happens.

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[laserjock]

He warmed it up tonight. Here are the values he sent me for the IDM test.

Test cold #2 4 6 8 cylinders 3.2 ohms #1 3 5 7 cylinders 2.9 ohms.
Test warm #2 .50
#4 .50
#6 30.0
#8 .94
#1 1.0
#3 1.0
#5 1.2
#7 .50

He started the truck and it idled okay. He gave it a little fuel and he says it has a little “flutter” at 2k. No lights on at the moment now.

What do those numbers say to you guys? I’d expect them to be a little different warm but I’d expect them all to change roughly the same amount. Does that make any sense? That said I’ve never laid hands on one of these.

 

[79jasper]

I think at this point, I would do the UVCH along with the pigtails.
I also think I would pull #4 injector and look at the orings.

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[clint bartels]

I think you mean #6 as 30 is excessive.

 

[79jasper]

Uh, no. I meant cylinder #4.

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[clint bartels]

Uh, no. I meant cylinder #4.

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Ok I guess I need an explanation of why. To me #6 is the odd ball out as cyl 1-5 and 7-8 are all 0.5 to 1.0 ohms. What designates #4 a pull and inspection.