7.3 bank 1 high side open

7.3powerstroke00 · Feb 15, 2017

I've been working on a bone stock 2000 7.3 with around 320k miles. It came in not running, driver side injectors are working and pumping oil. Passenger side does nothing, swapped out idm and no change. Picked up a good engine harness and both vc gaskets and harnesses and installed them. It started and ran great for a few min then developed a lope and smoothed back out. Shut it down after a few min and came back the next day. Started it up ran great for a few min then died.

Now it's back to only driver side bank working and passenger side nothing. I've changed cps with no improvement. Had code for ebp sensor fault. Unplugged ebp sensor and icp sensors no change. Ohmed wiring from 42 pin to idm and it's good. I've unplugged pass side injectors 1 or 2 at a time checking for shorted solenoid. It will buzz test all 8 injectors, then shows bank 1 high side open... It's getting over 100 volts to the vc gaskets on both sides.

Any ideas where to go next because I'm all out lol...

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heavydoc · Feb 15, 2017

Each vc harness has a separate ground. Does the passenger side have a good ground.

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7.3powerstroke00 · Feb 15, 2017

heavydoc said:
Each vc harness has a separate ground. Does the passenger side have a good ground.

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From what I'm seeing yes.

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heavydoc · Feb 15, 2017

Try ohming it from the idm swamps has a pretty good diagram for troubleshooting injector problems. Ill post it here in a bit if you don't find it.

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7.3powerstroke00 · Feb 15, 2017

heavydoc said:
Try ohming it from the idm swamps has a pretty good diagram for troubleshooting injector problems. Ill post it here in a bit if you don't find it.

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Ok thanks.

Main thing throwing me for a loop is how it started and ran great for 10 min or so after replacing engine harness and vc gasket assemblies.

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heavydoc · Feb 15, 2017

https://16x1p531pcnxjpi9p2ewt95n-wpengine.netdna-ssl.com/files/7.3LInjectorDiagnostic.pdf

https://swampsdiesel.com/ford-diagnostics/

heavydoc · Feb 15, 2017

https://system.netsuite.com/core/media/media.nl?id=609394&c=744110&h=a78527245dc5a18cb805

KBMKVIII · Feb 15, 2017

heavydoc ftw!
Jake, it must be the wooden bead seat covers...

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heavydoc · Feb 16, 2017

KBMKVIII said:
heavydoc ftw!
Jake, it must be the wooden bead seat covers...

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Thanks, I've had my fair share of injector/idm issues over the last 6 months.

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Arisley · Feb 16, 2017

7.3powerstroke00 said:
Ok thanks.

Main thing throwing me for a loop is how it started and ran great for 10 min or so after replacing engine harness and vc gasket assemblies.

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What brand of UVCH did you buy?

7.3powerstroke00 · Feb 16, 2017

Arisley said:
What brand of UVCH did you buy?

They are the Dorman brand from Napa. I have used them I the past with no issues. But anything is possible, I swapped sides with the uvch and the problem did NOT follow the uvch.

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Jomax · Feb 16, 2017

Never liked Dorman, the Connections never felt good when locking them in.

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Arisley · Feb 16, 2017

I won't buy or use anything from Dorman. Been bit in the ass way to many times.

I would start by cleaning all ground connections. Don't just scrub them off, remove and clean all mating surfaces, on the strap, block, body, frame, everywhere, including the bolt threads. Reinstall straps and go from there.

7.3powerstroke00 · Feb 16, 2017

Arisley said:
I won't buy or use anything from Dorman. Been bit in the ass way to many times.

I would start by cleaning all ground connections. Don't just scrub them off, remove and clean all mating surfaces, on the strap, block, body, frame, everywhere, including the bolt threads. Reinstall straps and go from there.

Thanks I'll give it a try. He was driving it down the road when it happened. Just started losing power, limped it about a mile at about 5 mph to his house.

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