E4OD experts please chime in

Exhumis

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I'm beginning to understand why people hate this transmission. It's not the transmission, it's all the stupid sensors it runs off of.
Here's the scene: 93 f250, replaced shift solenoid, get the truck out onto the street and she shifts better than ever, right up to 55mph and then just holds. No shift into overdrive. If I mess around with the throttle I can get it to shift into overdrive. Pushing the button does nothing but it lights up when pressed. Already confirmed with the shop it's the correct solenoid confirmed via pics. New mercon V fluid at right level. No adjustment to fipl prior to this issue but readjusted it just the same to 1.58 and 4.0 respectively, no change. Fipl is 6 months old. MLPS about 9 months old, confirmed it is adjusted correctly. Also when I I'm driving pressing the od light does nothing. So I ripped the steering column apart and cheched the button wires from the button all the way to the plug and didn't see any breaks.
Anyone have any ideas? This truck is driving me nuts
 

Exhumis

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Will that throw a code? I ran my reader on it and she didn't throw any codes
 

tbrumm

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No adjustment to fipl prior to this issue but readjusted it just the same to 1.58 and 4.0 respectively, no change. Fipl is 6 months old. MLPS about 9 months old, confirmed it is adjusted correctly.

The FIPL should be adjusted so your digital voltmeter reads a max of 1.2 volts at closed throttle. I personally have mine set at 1.18 volts and the trucks shifts slightly less harshly than at the 1.2 volt setting. The volts you read at WOT should around 4 volts, but you can't control the WOT voltage - it is the closed throttle voltage that is the important one. I also have heard that the computers in our trucks that control the E4OD are relatively "primitive" compared to the computer controls used now that they sometimes won't register a code even though there should be one stored.

You think the E4OD is a pain because of all the sensors? I wonder how much fun these new 10 speed automatics are to work on?
 

Thewespaul

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The computer is what supplies the codes, so if the tcm were going out you may not get a code even if there are other faults. The new trucks are definitely no fun to work on, but the computer system is drastically improved with diagnosis being much simpler than the antiquated 0BD1 system, once those new trucks are 25-30 years old though...
 

steve phillips

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Exhumus, check you pcm relay under the hood, supplies power to trans. check electrical connector on the passenger side of trans , common for these to melt. I can dig up some troubleshooting info on E04d trans if you want. also look over wiring harness to trans , if loose can get burnt on exhaust or damaged. I chased a random limp mode problem on my 94 for couple of months, finally learned enough to change relay worked for years, till zf5 swap.
 

IDIBRONCO

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once those new trucks are 25-30 years old though...
With all of the electronics, I can't see very many of them lasting that long. Maybe if they're constantly stored inside and don't see many miles each year. Of course we can also buy a museum quality show car/truck and do the same thing. That way, in 25-30 years, it will only be worth more while the new trucks will only lose value at a quick rate.
 

Exhumis

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Exhumus, check you pcm relay under the hood, supplies power to trans. check electrical connector on the passenger side of trans , common for these to melt. I can dig up some troubleshooting info on E04d trans if you want. also look over wiring harness to trans , if loose can get burnt on exhaust or damaged. I chased a random limp mode problem on my 94 for couple of months, finally learned enough to change relay worked for years, till zf5 swap.
I'd appreciate that info very much. I'll check the relay. Shift solenoid connector is new and greased. I pulled the plug off the firewall cleaned and greased it. I pulled the trans tunnel cover and chased the wires, cleaned and rewrapped the harness, didn't see anything broken.
 

Exhumis

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Yup light works. Pushing the button switches the light off and on but doesn't affect the transmission
 

TNBrett

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Another thing to check with odd electrical issues is your grounds. Pull up a wiring diagram, and check and clean every ground connection that has anything to do with the transmission. Also anything else that might be supplying info to it VSS, tach pickup, etc. Also check engine to chassis and engine to body grounds. I’ve solved plenty of mystery issues that way.


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Exhumis

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Yup did all that too. Still didn't help.
I did, however, fix it but not in a way I would have anticipated.
I remembered reading a post over at the diesel stop where a guys fipl didn't like being at 1.2 so he lowered it and got great results. I played with mine and set it at 1.02v and around 3.8v at wot. Shifts perfect now. TC unlocks with a tap of the brakes and engine braking kicks in. Od button now engages and disengages the od. Near as I can figure the truck had a shift solenoid going out when I bought it which I didn't know. It also had the old style fipl. So I replaced the FIPL and the voltage was set higher probably unknowingly compensating for the wonky shift solenoid. Well when I replaced the shift solenoid it must have decided it didn't like the current fipl setting. So I figured what the heck 1.2 is a starting point let's see what happens. Smooth as butter now
 

Noiseydiesel

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Ford transmissions love the "Neutral Safety Switch" going out or as ford calls it, a "Range Selector Switch".
That is how I got my E4OD to finally work right.
 
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