7.3 electrical gremlins

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Nov 9, 2023 | 07:12 AM

WeirdMan

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4th Gear

Joined: Nov 2023

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7.3 electrical gremlins

Ill start with what the engine is doing. It idles fine and revs good but the moment it starts warming up. You rev it and it completely shuts off bank 1 only after you let off the gas. Check engine light comes on and then it self clears and goes back to idling normally. The original owner put a 2 new idm's in it less than a year apart. We have had the idm and PCM checked and both are good, we have done the uvch, ipr, #5 injector, and cps. We do a buzz test and every Injector sounds loud and strong but it throws these 5 codes. P0273, p1271, p1277, p1273, p1293. I'm completely stumped, any help would be much appreciated.

Nov 9, 2023 | 07:20 AM

96SD

Laughing Gas

Joined: Sep 2019

Posts: 797

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From: Arkansas

When you replaced the UVCH you did use Motorcraft along with a Motorcraft CPS? Also when you did the UVCH you did change the gasket along with everything else? All the connectors to the UVCH are in good condition?

Nov 9, 2023 | 07:22 AM

1994F2507.3L

Cargo Master

Joined: Mar 2010

Posts: 2,227

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From: Higginsville, MO

I would start by pulling the harness and checking it out end to end, make sure there isn’t a shirt somewhere. If the harness checked out good then I’d be leaning toward the IDM. Those are all injector codes.

Nov 9, 2023 | 08:03 AM

JWorley

Mountain Pass

Joined: Jul 2023

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On the engine wiring harness, the wires on the plug going into the valve cover can get bent in strange ways that make bad connections, especially under the intake boot.

Nov 9, 2023 | 08:20 AM

knottyrope

Lead Driver

Joined: Apr 2016

Posts: 7,189

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From: Bahstun

https://www.ford-trucks.com/forums/1...load-test.html

Might have a break in the harness and the above can do a load test on it to find out where

Or take apart the loom and trace each wire out, pull each wire looking for a break

Nov 9, 2023 | 09:24 AM

WeirdMan

Thread Starter

4th Gear

Joined: Nov 2023

Posts: 4

Likes: 1

Quote:

Originally Posted by JWorley

On the engine wiring harness, the wires on the plug going into the valve cover can get bent in strange ways that make bad connections, especially under the intake boot.

I Have gone through the wiring harness end to end but the connector wires on bank 1 are bent in a weird way now that I think about it. I just didn't think that would cause this problem

Nov 9, 2023 | 10:28 AM

DP-Tuner

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Joined: Mar 2005

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From: Hoschton,GA

Looking at that image I would replace the pigtails.

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Nov 12, 2023 | 12:10 PM

WeirdMan

Thread Starter

4th Gear

Joined: Nov 2023

Posts: 4

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Update, I put a new injector in, did a new uvch connector and decided to put 2 new batteries in it. And she is running beautifully. Thank y'all so much for your help!