94 f150 E4OD shifting problem
Thread Starter
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Freshman User
Joined: Jul 2012
Posts: 35
Likes: 0
when you try to kick it into passing gear it acts like its going into the lowest ger it has, it jerks and slams down and goes right back to 4th when you let off. i believe its in limp mode, it has all the symptoms of that.
it didnt show any codes at all the first time i had it read.
how would you check the wiring for power, with a simple tool?
it didnt show any codes at all the first time i had it read.
how would you check the wiring for power, with a simple tool?
Lead Driver
Joined: Jul 2007
Posts: 7,868
Likes: 9
From: Rhode Island
Please do what I said earlier and manually shift through the gears.
You'll need a long length of road and constant throttle. Start out in 1st with OD off, then work through until you're in drive, then re-enable overdrive. You should feel/notice 3 shifts, maybe 4 if your torque converter lockup is noticeable. This will verify that the wiring is correct and functional.
The only thing E4OD limp mode does is default to maximum line pressure and disable torque converter lockup IIRC. Which will make it shift very hard and harsh.
Full electrical failure to the transmission causes it to default to 4th in drive, and 2nd in the 1st or 2nd range
You'll need a long length of road and constant throttle. Start out in 1st with OD off, then work through until you're in drive, then re-enable overdrive. You should feel/notice 3 shifts, maybe 4 if your torque converter lockup is noticeable. This will verify that the wiring is correct and functional.
The only thing E4OD limp mode does is default to maximum line pressure and disable torque converter lockup IIRC. Which will make it shift very hard and harsh.
Full electrical failure to the transmission causes it to default to 4th in drive, and 2nd in the 1st or 2nd range
Thread Starter
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Freshman User
Joined: Jul 2012
Posts: 35
Likes: 0
i manually shifted it and it had 3 shifts that you could feel. but it feels to go into 4th as soon as i reenable od. when you kick it into passing gear it will turn a bunchof rpms and jump into ger violently.
Lead Driver
Joined: Jul 2007
Posts: 7,868
Likes: 9
From: Rhode Island
It isn't just how many are supposed to light up. There are many solenoids the computer energizes at specific times to do specific things.
The fact that it goes into each gear when manually shifted indicates that the major solenoid connections are correct and functioning.
The fact that it goes into each gear when manually shifted indicates that the major solenoid connections are correct and functioning.
Fleet Owner
Joined: Aug 2005
Posts: 23,668
Likes: 301
From: Easton,Ks
It could be a bad PSOM or computer causing all of your problems.
You might try unplugging the RABS module and the speed control module then see if it works OK.
You could also have bad bearings in the rear end.
You might try unplugging the RABS module and the speed control module then see if it works OK.
You could also have bad bearings in the rear end.
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Fleet Owner
Joined: Aug 2005
Posts: 23,668
Likes: 301
From: Easton,Ks
The RABS module is located behind the glove box.
The Speed Control Module is located under the hood at the driver side hinge of the hood.
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The Speed Control Module is located under the hood at the driver side hinge of the hood.
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Lead Driver
Joined: Jul 2007
Posts: 7,868
Likes: 9
From: Rhode Island
The jumpy speedometer is a key thing you left out!
The way it works, is the speed signal from the sensor from the differential first goes to the speedometer module, which then sends it to the computer. The computer uses the speed information to shift. If the speedometer is jumping around, than the computer is also getting a speed signal that is jumping around.
Common things to go bad are the VSS sensor in the rear end, the Speedometer module itself, and the RABS module.
The way it works, is the speed signal from the sensor from the differential first goes to the speedometer module, which then sends it to the computer. The computer uses the speed information to shift. If the speedometer is jumping around, than the computer is also getting a speed signal that is jumping around.
Common things to go bad are the VSS sensor in the rear end, the Speedometer module itself, and the RABS module.