94 f150 E4OD shifting problem
Lead Driver
Joined: Jul 2007
Posts: 7,868
Likes: 9
From: Rhode Island
If it is still doing that even with the new computer, then the computer is receiving an irregular speed signal from the PSOM or the TPS is bad, or there is still a wiring issue to the transmission.
The transmission has a warranty, right?
The transmission has a warranty, right?
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
Did you use the old TR sensor off the old transmission?
You may have a bad TR sensor or one that is out of adjustment.
You have to be in Neutral to line up the lines to get the TR sensor to work right.
Just put one on a few minutes ago.
You may have a bad TR sensor or one that is out of adjustment.
You have to be in Neutral to line up the lines to get the TR sensor to work right.
Just put one on a few minutes ago.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
Block the wheels and put the E4OD in Neutral.
Take the nut off the shift arm at the E4OD and pry it off using the heads of the two screws that hold the sensor on as a pivot point.
Loosen the two screws that hold the sensor on.
Twist the sensor until the two lines line up.
Tighten the two screws and check that the two lines are still lined up.
Put the shift arm back on the shaft with its nut.
That is about all there is to it.
Good luck.
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Thread Starter
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Freshman User
Joined: Jul 2012
Posts: 35
Likes: 0
i lined it up and it acted quite a bit better but its still not right, its still not shifting as it should. a new transmission should work perfectly as soon as its put in right? it doesnt need to be broke in or anything?
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Lead Driver
Joined: Jul 2007
Posts: 7,868
Likes: 9
From: Rhode Island
The transmission in these trucks is "dumb". There is no shift logic built into its hydraulics, It's entirely controlled by the computer.
What was the old transmissions doing before it died, and how long was the truck out of commission?
One thing I haven't thought of, is that the early E4OD solenoid packs had back-EMF protection diodes built into it, while the later ones do not. Basically when you turn a solenoid off, the magnetic field collapses and generates a large high-voltage pulse on the circuit. You put a diode on backwards across the circuit, and it will prevent the high voltage pulse from damaging sensitive circuitry - like the computer. 89-94 E4ODs had the protection diodes built into the solenoid pack, while the 95-97 E4ODs did not - they moved the protection diodes into the computer.
Using a late model E4OD on an earlier computer (which you are doing) has the possibility of damaging the computer. This is quite possibly what happened.
What was the old transmissions doing before it died, and how long was the truck out of commission?
One thing I haven't thought of, is that the early E4OD solenoid packs had back-EMF protection diodes built into it, while the later ones do not. Basically when you turn a solenoid off, the magnetic field collapses and generates a large high-voltage pulse on the circuit. You put a diode on backwards across the circuit, and it will prevent the high voltage pulse from damaging sensitive circuitry - like the computer. 89-94 E4ODs had the protection diodes built into the solenoid pack, while the 95-97 E4ODs did not - they moved the protection diodes into the computer.
Using a late model E4OD on an earlier computer (which you are doing) has the possibility of damaging the computer. This is quite possibly what happened.
Elder User
Joined: Dec 2003
Posts: 660
Likes: 3
From: Northern California
One thing I haven't thought of, is that the early E4OD solenoid packs had back-EMF protection diodes built into it, while the later ones do not. Basically when you turn a solenoid off, the magnetic field collapses and generates a large high-voltage pulse on the circuit. You put a diode on backwards across the circuit, and it will prevent the high voltage pulse from damaging sensitive circuitry - like the computer. 89-94 E4ODs had the protection diodes built into the solenoid pack, while the 95-97 E4ODs did not - they moved the protection diodes into the computer.
Using a late model E4OD on an earlier computer (which you are doing) has the possibility of damaging the computer. This is quite possibly what happened.
Using a late model E4OD on an earlier computer (which you are doing) has the possibility of damaging the computer. This is quite possibly what happened.
You certainly have my respect.
Bob
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
/
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
I thought he said he installed a E4OD from another 1994 F-series truck in his 1994 truck. I thought he just had a malformed plug as to why he was having trouble with the plug.
Elder User
Joined: Dec 2003
Posts: 660
Likes: 3
From: Northern California
I checked the PSOM visually and found no signs of any problems. everything looked really good. Then i checked my PCM and it looked perfect. but it had no electrical compacitors in it like were showed in the picture that was posted.
This is a little disturbing and may be a clue as to what is and was going on. To me, it sounds like his "origional PCM" was the wrong year for his truck.........causing electrical damage or a mismatch somewhere ???????
I bought a PCM out of a 93 f150 with the same motor and trans and it had 3 electrical compacitors. is there a diffference in the compacitors and such in a 94 PCM than in anyother one?
im still dead in the water, its still having problems and i dont know whats causing it. i took it for a drive down a 2mile mile road and held a constant speed and throttle and the truck was constantly shifting between 3rd and 4th. whats causing that?
This is a little disturbing and may be a clue as to what is and was going on. To me, it sounds like his "origional PCM" was the wrong year for his truck.........causing electrical damage or a mismatch somewhere ???????
I bought a PCM out of a 93 f150 with the same motor and trans and it had 3 electrical compacitors. is there a diffference in the compacitors and such in a 94 PCM than in anyother one?
im still dead in the water, its still having problems and i dont know whats causing it. i took it for a drive down a 2mile mile road and held a constant speed and throttle and the truck was constantly shifting between 3rd and 4th. whats causing that?
Bob
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
Well I have never seen a PCM Computer for out era trucks that did not have the electrical capacitors in it.
The 1993 PCM Computer is a Push-Start Ignition system Computer and will not work right in a 1994 Truck that has a CCD Ignition System.
The 1993 PCM Computer is a Push-Start Ignition system Computer and will not work right in a 1994 Truck that has a CCD Ignition System.