big big engine problem- no solution?? - Ford Powerstroke Diesel Forum
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Old 09-05-2012, 02:41 AM
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big big engine problem- no solution??

hello guys,

here in germany the garages have mostly no idea about the powerstrokes.

try to help me please to find out what is wrong:

our '95 ford v8 td 7.3 powerstroke ran correctly to a fuel station to fill it

with about 2/3 new fuel.

7 miles later about 50miles/h the engine runs like a 4 cylinder vehicle and had no

power anymore.

we drove back to the gasoline station to ask for the diesel quality. (they said-very good)
then i tried a new diesel filter- but no better result.

30miles later the truck had power like one horse but not more- i had to

dump speed accellerator -otherwise the engine is turned off.

the next day- engine likes to start but it is not possible anymore.


now the truck is in a garage & they said that the injections of the right bank have no electrical signal.

they do not know really what to do to find out the real problem.


greets condrat
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Old 09-05-2012, 03:59 AM
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Valve cover gasket

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Old 09-05-2012, 04:12 AM
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Sounds like the injector harness. With the truck running unplug one side. The plug is on the top side of the valve cover. If there is no change then it's that side. If it shut off then the opposite side in the problem.

Do a search and youll find a lot of info about the harnesses.


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Old 09-05-2012, 04:15 AM
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Just read the end of your post. I should have finished reading before I posted lol.

It's the right side valve cover gasket probably. When they change that have them do the harnesses for the injectors too so you don't have to do it again because the right side valve cover is a b*tch to get off.


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Old 09-05-2012, 04:17 AM
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UVCH. Under valve cover harness. Or the connector to it.
Very simple.
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Old 09-05-2012, 07:23 AM
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To clarify - your truck has two connectors / harnesses on each side (total of four). On the right side, the front connector energizes the injectors for #1 and #3, and the rear one energizes #5 and #7. If there is a problem with any one of them, the IDM (injector drive module) can shut down that whole side of the engine. So disconnect those connectors at the right valve cover and inspect them for damage, burning, etc. You may also need to remove the right valve cover and inspect the wiring and connectors inside.
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Old 09-11-2012, 04:03 AM
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hello,
thank you for the informations.
the garage said that valve cover gasket lines are fine.
On the two right connectors to the gasket is no control flow.
On the way from the controller to the plugs according to statement a Ford specialist told us there should be
a high-voltage module, but no one knows exactly where.
Is there more info on forum, I would be grateful for your help.

greets condrat
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Old 09-11-2012, 05:05 AM
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Quote:
Originally Posted by condrat View Post
On the two right connectors to the gasket is no control flow. On the way from the controller to the plugs according to statement a Ford specialist told us there should be
a high-voltage module, but no one knows exactly where.
If you're referring to the injectors, the control and timing come from the PCM, which is the module that goes through the firewall. You see part of it sticking out through the firewall under the hood, and you see part of it inside the truck, but only if you remove the bolts for the parking brake handle and move it aside. Indeed, between the PCM and the injectors is the IDM - Injector Drive Module. And indeed, it has been known to shut down one side of the engine. It is located under the hood, on the inside of the left fender, a bit forward of the PCM. It would be a good idea to remove the connectors to the PCM and IDM and inspect them.

There's one other common thing that happens to the IDM, but it usually causes it to fail completely, not just to disable one side of the engine. It's commom for water to get inside the box and damage the electronics. So it might also be worth removing it from the inner fender and giving it a shake, to see if you hear water sloshing inside it.

Otherwise, check the wiring going from the IDM to the valve covers. You can recognize the valve cover wiring harnesses (bundles) by the fact that they have red tape winding around them, along with the black tape.
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