I need an E4OD expert
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Trailering
Joined: Mar 2024
Posts: 17
Likes: 11
I need an E4OD expert
Hello! I have a 1994 f250 351 with an E4od 4x4. I am experiencing a very loud grinding noise coming from the bottom of the truck around the driver seat. Here is a link to the noise: Link. I got this truck with a rebuilt transmission but there was a ton of **** wrong with it. A few of the things I've replaced related to the noise is the PCM, EPC, trans filter, radiator, transmission cooler, and a trans fluid flush. The PCM replacement fixed a lot of the issues I was having but this noise came out of nowhere. The codes I have for KOEO are 552 and 624. No codes for CM. Codes I have for KOER are 311, 332, and 632. I am stumped and everyplace I go wants me to buy a new transmission when this one barely has 5,000 miles on it and the warranty has expired
. I'm to the point where I think I may just drive it till it grenades itself🤷♂️
. I'm to the point where I think I may just drive it till it grenades itself🤷♂️
Fleet Owner
Joined: Jul 2006
Posts: 20,395
Likes: 864
From: Mi'kma'ki
Is the inspection cover bent, rubbing the flex plate? You're sure it's not a bent brake dust shield? Nothing rubbing against the driveshaft? Have you jacked the tires up to spin them to see if you hear the noise? Looks like you have solenoid related issues. Though written for the IDI diesel section, the basics apply:
E40D: The Importance Of A Clean Trans Harness.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,739
Likes: 2,669
From: SE Florida
Code 624 is the code for an electrical fault between the PCM and the EPC (Electronic Pressure Control) solenoid. With that code present, you'll have either max pressure all the time in the trans, or if it is shorted to ground, minimum pressure. If it is at max pressure, that can cause noises. If it is at minimum pressure, that will cause slippage, which will destroy the transmission. Find and fix the cause of this code. It is usually a damaged wire to the EPC.
Thread Starter
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Trailering
Joined: Mar 2024
Posts: 17
Likes: 11
Code 624 is the code for an electrical fault between the PCM and the EPC (Electronic Pressure Control) solenoid. With that code present, you'll have either max pressure all the time in the trans, or if it is shorted to ground, minimum pressure. If it is at max pressure, that can cause noises. If it is at minimum pressure, that will cause slippage, which will destroy the transmission. Find and fix the cause of this code. It is usually a damaged wire to the EPC.
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Trailering
Joined: Mar 2024
Posts: 17
Likes: 11
Gotcha, is there a test or steps that you know of to check for that?
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Trailering
Joined: Mar 2024
Posts: 17
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Just found a another forum with you explaining to another feller how to check for short circuits and continuity in the wiring harness. I will test the harness in the morning and report back to you. One question though, what wire/wires am I checking on the PCM side of the harness? Thank you for the help and sharing your knowledge!
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Trailering
Joined: Mar 2024
Posts: 17
Likes: 11
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,739
Likes: 2,669
From: SE Florida
Plug the harness into the trans end. Check the resistance between pins 38 and the ground wire. That will give you the resistance of the solenoid. Also check in this configuration for short to ground and short to power.
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Trailering
Joined: Mar 2024
Posts: 17
Likes: 11
Okay I believe I understand that process. But what wire is the ground wire?
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Trailering
Joined: Mar 2024
Posts: 17
Likes: 11
I found two possible ground wires on the ecu connector. Pin 40 and pin 60. I guess I can test both grounds?
Thread Starter
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Trailering
Joined: Mar 2024
Posts: 17
Likes: 11