95 E4OD shifting crazy
Hotshot
Joined: Nov 2017
Posts: 17,453
Likes: 2,767
From: Northern Ontario
As far as the LED resistor, I have not done it before, I’ll defer to another member to chime in on that.
Understood, no worries on the response time. Follow up when you’re settled back home, and can have a look over things.
Good luck with the exams.
Understood, no worries on the response time. Follow up when you’re settled back home, and can have a look over things.
Good luck with the exams.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,703
Likes: 2,624
From: SE Florida
If I remember correctly, this truck has a PSOM (Programmable Speedo/Odo Module) located on the back of the instrument cluster. When the PSOM starts to fail you get erratic operation such as what you're describing.
4wd Low
Joined: Mar 2011
Posts: 12
Likes: 0
From: NE Pennsylvania
Is there a way to test the PSOM? Will a bad PSOM throw a code? I'm having similar problems with my 1997 F250 HD, 460, E4OD, 4x4. What code reader or APP or laptop software is recommended for these old trucks? My '97 is EEC IV, fwiw.......
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,703
Likes: 2,624
From: SE Florida
Logistics Pro
Joined: Nov 2013
Posts: 3,922
Likes: 1,192
From: Mojave, Ca
There is no special tool to diagnose a the PSOM signal. You'd need to use an oscilloscope and watch the signal. The easiest place to tap into the PSOM speed signal is under the hood, at the cruise control servo. Unplug it and find the speed sensor wire to back-probe.
4wd Low
Joined: Mar 2011
Posts: 12
Likes: 0
From: NE Pennsylvania
An LED 3rd brake light won't cause a problem as long as your left and/or right brake lights are still incandescent.
There is no special tool to diagnose a the PSOM signal. You'd need to use an oscilloscope and watch the signal. The easiest place to tap into the PSOM speed signal is under the hood, at the cruise control servo. Unplug it and find the speed sensor wire to back-probe.
There is no special tool to diagnose a the PSOM signal. You'd need to use an oscilloscope and watch the signal. The easiest place to tap into the PSOM speed signal is under the hood, at the cruise control servo. Unplug it and find the speed sensor wire to back-probe.
4wd Low
Joined: Mar 2011
Posts: 12
Likes: 0
From: NE Pennsylvania
You can read codes on EEC -IV with this method: www.troublecodes.net/ford
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7th Gear
Joined: Apr 2025
Posts: 7
Likes: 1
From: Hill Country Texas
So after a long time troubleshooting and spending WAY too much money. I finally fixed everything. My problems were caused by a multitude of issues. First off, the transmission was toast. When I dropped the pan to check the solenoids, it looked like someone threw a party in it with how much glitter. Turns out an E4OD can only handle 300k miles of abuse and no maintenance.
I got a "new" transmission (50k miles on it), put in a brand new solenoid pack, added a trans-go shift kit, and a new torque converter and low and behold, I had 3rd gear again and 1-3 shifts were like normal. However I still had a problem with locking up in 4th way too early and not getting out of it.
I did have an oscilloscope so I couldn't test the VSS, but I had tried of couple different new VSS and all of them didnt work. I went to pick and pull and took a VSS from a junked f150 and that fixed everything. IDK why but I guess my truck doesn't want new parts.
TL
R: Transmission was cooked. New parts suck. VSS was the issue.
Thank y'all for all the help
I got a "new" transmission (50k miles on it), put in a brand new solenoid pack, added a trans-go shift kit, and a new torque converter and low and behold, I had 3rd gear again and 1-3 shifts were like normal. However I still had a problem with locking up in 4th way too early and not getting out of it.
I did have an oscilloscope so I couldn't test the VSS, but I had tried of couple different new VSS and all of them didnt work. I went to pick and pull and took a VSS from a junked f150 and that fixed everything. IDK why but I guess my truck doesn't want new parts.
TL
R: Transmission was cooked. New parts suck. VSS was the issue.Thank y'all for all the help
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Cargo Master
Joined: Mar 2007
Posts: 2,791
Likes: 1,009
One thing about all these VSS sensors is that there is a possibility that the sensor does not go far enough in to 'see' the tone ring. The stock ones do and that is why an old used one is better then a new one. If you get a new one and it does not work, modify the mount so the sensor goes further into the differential. It seems to fix issues with the new sensors that all seem to not work.
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