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Trucks, Trailers and Hauling for Shows

F550 7.3 powerstroke trouble

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Old 03-09-2015, 04:04:47 PM
shakeyjake36 shakeyjake36 is offline
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Default F550 7.3 powerstroke trouble

I'm working on a 2000 F550, it has 7.3 powerstroke and it is driving me nuts. It will only start with the block heater plugged in. I have changed all the glow plugs, the solenoid and relay, the valve cover harness, and the ipc. it does not matter if tis 80 degrees outside , I still have to plug it in. ANY IDEAS????
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Old 03-09-2015, 06:12:52 PM
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Nick Nick is offline
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Default Re: 7.3 powerstroke trouble

How many miles on the motor? How does it run when it finally starts? And how about when up to operating temp? Will it restart hot? Is it giving any codes? Did you by chance check the injector armature clearance whilst working on the glow plugs? Verified correct voltage at the GPR terminals and GPR operation?
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Old 03-09-2015, 07:57:13 PM
Dan W. Dan W. is offline
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Default Re: 7.3 powerstroke trouble

do you have a power programer installed, my programer one time shut off the glow plug cycle in the in the computer, i had to uninstall it and reinstall and has worked since then.
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Old 03-09-2015, 09:50:24 PM
C-Wade7 C-Wade7 is online now
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Default Re: 7.3 powerstroke trouble

Have had several do it in the past that had high mileage and it was an injector issue. We have a air check fixture to test them in but we almost always did all 8 if it was 300k. Usually 6-7 would fail bench testing.
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Old 03-10-2015, 07:56:15 PM
Tony Rye Tony Rye is offline
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Default Re: 7.3 powerstroke trouble

inj. fixed mine
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Old 03-10-2015, 10:48:58 PM
s100 s100 is offline
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Default Re: F550 7.3 powerstroke trouble

Here's a long shot. Years ago I bought my first Olds diesel and it would not start at cold start without a lot of cranking. Once it was started, it would restart just fine. (This was a big part of the reason the original owner sold me the car.) I changed the fuel filter and the world was a happy place. The non-OEM filter either did not have a check valve or if it did it was malfunctioning. Fuel would bleed back to the tank and the charge pump would have to refill the system each time. Since it took a while for the fuel to bleed back down, it would start easily for a while once it had been running. Understand this was not a plugged or restricted filter. When it was running it made good power and got plenty of fuel.

The Olds and the IH use a similar Stanadyne distributor pump. I don't know if the fuel filter is similar, too. With everything else you replaced on that thing maybe you'd consider replacing the fuel filter as well.

You don't say much about the symptoms, other than it starts when plugged-in. If you don't plug in and continue to crank, does it start eventually? Will it start with a snort of WD40? If it starts and you shut it off for a while, will it restart easily? How long must it be off before it won't start on its own? (Cold start, run for a minute or so, shut off.) When you crank, and it does not start, does it make white smoke from the exhaust? When you key-on, do the glow plugs pull the voltage down like they're supposed to?

It sounds from your post that you have done all the common sense things that should have solved the problem. That means the cause of the problem will likely be something that will have you saying, "Nah, it can't be anaything like that." Finding the cause of a problem like this won't happen by shotgunning parts. You need to get the service manual and go through the diagnostic tests and take data then compare them to the norm or the desired results in the manual.

And when you do find the problem, be sure to let us know what it was!
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Old 03-10-2015, 11:44:13 PM
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Mikey4026 Mikey4026 is offline
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Default Re: F550 7.3 powerstroke trouble

Glowplug relay, does it have battery and control power to it?
Have you checked it?
Test the pass thru connectors in the valve cover gaskets, my guess is that they are the problem. They fooled me once.
You can by pass the solenoid (relay) to make sure the power actualy gets to the glowplugs, only do this test momentarily as you are connected and ready to test at each plug. I have seen the harness from the relay to the valve covers burn up, but not often.
If you have no control voltage to the relay, you have a wiring problem.
Those glow plugs are difficult to get to arent they!
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