Engine Missing
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Junior User
Joined: Nov 2010
Posts: 89
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From: South Illinois
Engine Missing
My 96 7.3 was setting in the garage and not been driven for several weeks, it was running fine when I parked it I had just put a new mechanical fuel pump on it. I started it to drive it and it is running but really rough with no power. Like it has 1 or 2 dead cyl.
It did have a battery that was a dead short , I replaced that and changed the fuel filter, but it still runs rough. Anyone have any ideas?
Thanks in advance.
Thanks RB
It did have a battery that was a dead short , I replaced that and changed the fuel filter, but it still runs rough. Anyone have any ideas?
Thanks in advance.
Thanks RB
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Junior User
Joined: Nov 2010
Posts: 89
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From: South Illinois
How can I tell if the wiring harness is bad?
thanks again RB
Logistics Pro
Joined: Oct 2008
Posts: 4,818
Likes: 1
From: Avilla, IN
How much have you driven the truck since you changed fuel pumps? Could just be some air in the system.
There are two 5-wire plugs on valve cover gasket on each head. Unplug them and look for melted plastic and burnt pins or signs of arcing.
There are two 5-wire plugs on valve cover gasket on each head. Unplug them and look for melted plastic and burnt pins or signs of arcing.
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Junior User
Joined: Nov 2010
Posts: 89
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From: South Illinois
Those wires have been replaced about 10k miles ago.
It just seems wierd that it was running great when I parked it.
Thanks RB
Trending Topics
Lead Driver
Joined: Apr 2016
Posts: 7,210
Likes: 1,341
From: Bahstun
what is fuel pressure at Schrader valve?
Connectors can fall off
can be IPR nut is loose
low oil can cause lack of power
more than 1/4 tank of fuel?
Connectors can fall off
can be IPR nut is loose
low oil can cause lack of power
more than 1/4 tank of fuel?
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Thread Starter
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Junior User
Joined: Nov 2010
Posts: 89
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From: South Illinois
RB
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Junior User
Joined: Nov 2010
Posts: 89
Likes: 0
From: South Illinois
I had to wait on a turbo intake boot that I got from Riff Raff, great guys!
I had 57 psi at schrader valve.
All the connectors looked good , nice and shiny. There was a little dampness in 1 looked oily.
Full of oil.
both tanks full of fuel.
Not sure where the IPR nut is?
Any more ideas?
Thanks RB
New User
Joined: Apr 2016
Posts: 23
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From: Pueblo Colorado
I had an issue a while back but it turned out to be a loose injector connection on UVCH. UVCH is always the first thing I check on my 7.3. Mine lost power and sounded really. If you put it in drive and stall on the converter at 900 rpm and the truck shakes I would unplug each pig tail at a time (running and in park) on the valve cover and you should notice a huge difference if you unplug one and if notice a little difference in sound that pinpoints out 2 injectors. I would check connections before buying a new wiring harness.
Thread Starter
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Junior User
Joined: Nov 2010
Posts: 89
Likes: 0
From: South Illinois
I had an issue a while back but it turned out to be a loose injector connection on UVCH. UVCH is always the first thing I check on my 7.3. Mine lost power and sounded really. If you put it in drive and stall on the converter at 900 rpm and the truck shakes I would unplug each pig tail at a time (running and in park) on the valve cover and you should notice a huge difference if you unplug one and if notice a little difference in sound that pinpoints out 2 injectors. I would check connections before buying a new wiring harness.
Is the connections on the topside of the valve covers usually the problem or a connection actually under the valve cover?
Thanks RB
