E4OD shifts too quickly
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6th Gear
Joined: Apr 2023
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E4OD shifts too quickly
I have a 94 E350 RV with 50k miles. It has a 460 and E4OD. When driving it want's to shift to the highest gear immediately. Shifting manually works fine. The PSOM tested good and the speedo works fine. The ECU had bad capacitors and a corroded trace but I was able to replace / repair them. I have no way to test though so it's possible that the ECU is the problem.
Is there anything else it could be?
Have any of you experienced this issue before?
Is it OK to drive long distances shifting manually?
Is there anything else it could be?
Have any of you experienced this issue before?
Is it OK to drive long distances shifting manually?
Last edited by KenCam; Apr 22, 2023 at 10:27 AM.
Cargo Master
Joined: Mar 2007
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Shift timing is done by the EEC IV computer so all the signals at the computer are checked and a decision to shift is given. I suspect if there is a problem, you would have a code. Assuming you do not have any codes, the shift timing is normal.
You could try programming the computer to shift at a different load, not something that the average person can do.
You could try programming the computer to shift at a different load, not something that the average person can do.
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6th Gear
Joined: Apr 2023
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Thanks for the reply!
I'm assuming ECC IV, ECU, ECM are all the same thing. The computer that runs the engine/trans.
It's very possible that it is still bad after I tried to repair it. There was quite a bit of corrosion from the leaking capacitors. I ohm tested all the traces and repaired one but I don't know how to test the unit. RockAuto has them in stock for ~$150 (listed as a ECM) I guess I'll order one.
I'm assuming ECC IV, ECU, ECM are all the same thing. The computer that runs the engine/trans.
It's very possible that it is still bad after I tried to repair it. There was quite a bit of corrosion from the leaking capacitors. I ohm tested all the traces and repaired one but I don't know how to test the unit. RockAuto has them in stock for ~$150 (listed as a ECM) I guess I'll order one.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,738
Likes: 2,667
From: SE Florida
There is a wire that when grounded tells the computer that the transfer case is in 4x4 low. This makes the shifts happen at a very low speed. I know your truck isn't a 4x4, but the computer doesn't know that.I don't have a wiring diagram to know which pin it is, but a search will probably turn one up.
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6th Gear
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6th Gear
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That is interesting. I found this:
https://www.transmissiondigest.com/c...in-e4od-4r100/
I think this is what is happening to me. I'm not sure how to test it yet. Can I just cut a wire at the ECU? Once I figure out which one...
https://www.transmissiondigest.com/c...in-e4od-4r100/
I think this is what is happening to me. I'm not sure how to test it yet. Can I just cut a wire at the ECU? Once I figure out which one...
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I have a 95 F250/5.8L/E4OD/2WD. I also have a Tweecer that I can see the programming of the ECU. I doubt if this can happen since the ECU knows it's 2WD.
As a professional, I like diagnosis and know why things are doing what they are doing. Cutting wires may be a cheap fix, but cutting wires [that may not be there because you have 2WD] is a terrible way to see if something happens. Just my thoughts.
As a professional, I like diagnosis and know why things are doing what they are doing. Cutting wires may be a cheap fix, but cutting wires [that may not be there because you have 2WD] is a terrible way to see if something happens. Just my thoughts.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,738
Likes: 2,667
From: SE Florida
How does the PCM know that it's a 2WD? There were not unique PCMs for 2WD and 4WD. The same PCM is used for both, and the wire is grounded when in 4x4L to change the shift schedules.
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Joined: Jun 2003
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From: Calhoun GA
The only two major players within the ECU for shift points are throttle position and vehicle speed. The ECU does have an RPM function, however, I've noticed those table are set so that VS and TP execute the shift first.
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