4EOD slipping issue
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New User
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4EOD slipping issue
I thought I just need a new transmission. The truck was my dads who was the original owner. Took excellent care of the truck. It seems ever once in awhile that the transmission disengages when in drive or overdrive. After reading this site I thought I would ask if someone has experienced a similar issue. Fluid is good. No leaks. And the problem doesn’t happen under similar conditions. It randomly just disengages... any suggestions?
Fleet Owner
Joined: Oct 2005
Posts: 20,785
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From: Kentucky
X2....run the Key On Engine Off (KOEO) tests and stored code display before going any further. This can be done with a paper clip/jumper but I highly suggest investing in a code reader such as the Innova/Equus 3145. How To Run a Self-Test
The above assumes this is a gas engine truck.
Your false neutral symptom is most like caused by a bad/failing Transmission Range (TR) sensor, aka Neutral Safety Switch (which is wrong), or the connections to it but run the codes first.
I assume this issue is happening on your 1994 F250 listed on your info page?
For the record your transmission is an Electronic 4 Speed Over-Drive (E4OD).
Welcome to FTE!
The above assumes this is a gas engine truck.
Your false neutral symptom is most like caused by a bad/failing Transmission Range (TR) sensor, aka Neutral Safety Switch (which is wrong), or the connections to it but run the codes first.
I assume this issue is happening on your 1994 F250 listed on your info page?
For the record your transmission is an Electronic 4 Speed Over-Drive (E4OD).
Welcome to FTE!
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,707
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From: SE Florida
I agree that it probably is a failing TRS. Running codes is always a good idea, but I recommend replacing the TRS no matter what the codes show, or most likely, don't show.
It has been my experience that the TRS will cause this but not set any codes. The failure mode is that the internal resistance increases to the point that the PCM reads N instead of D. The PCM doesn't flag this as an error because it doesn't know that you haven't moved the shift handle from D to N.
It has been my experience that the TRS will cause this but not set any codes. The failure mode is that the internal resistance increases to the point that the PCM reads N instead of D. The PCM doesn't flag this as an error because it doesn't know that you haven't moved the shift handle from D to N.
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[QUOTE=My4Fordtrucks;19062290]Sounds like an electrical issue sort of common to the E4OD. Usually caused by the range sensor failing but not always. Check for fault codes and do diagnostic work before replacing anything!
Lead Driver
Joined: Jan 2019
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From: N.W. Alabama
good info here on clean harness
E40D: The Importance Of A Clean Trans Harness. - Ford Truck Enthusiasts Forums
E40D: The Importance Of A Clean Trans Harness. - Ford Truck Enthusiasts Forums
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Fleet Owner
Joined: Jul 2006
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From: Mi'kma'ki
The new range sensor will cure all that ails here.That's a scary one.I mean who would think a sensor would cause your trans just loose it's gearing while driving down the road? lol Freaks ya right out that it must be something serious and very expensive. Just fyi but I recommend only using the motorcraft range sensor. I once had a replacement go out the same way as the old one failed inside a week or two! Replaced with motorcraft and she's been great since. I generally don't worry much about such things but when it comes to the sensors on this trans,I learned my lesson.
Other people probably use local parts stores sensors and been fine for years too,so. I had the same thing happen to a TPS too though from the local store and since went motorcraft with that too.Now I just stick with motorcraft when it comes to sensors.
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Mountain Pass
Joined: Nov 2014
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I had the same symptoms on my 1994 F250 with E4OD. I was told it was "typical of failing MLPS". So I went under there and found that the MLPS was OK but not aligned properly.
Minor adjustment, no dollars spent and maybe 15 minutes, problem solved.
Minor adjustment, no dollars spent and maybe 15 minutes, problem solved.
Hotshot
Joined: Jun 2015
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I replaced the range sensor in my ‘94 U150 but the issue would return intermittently. Driving down the road doing 35mph, pushing on the gas pedal and nothing. Then it would bang back into gear and be fine for who knows how long? Eventually a TPS code was set so I believe the failing TPS was also contributing to the problem. This is why I said to test the range sensor before just replacing it.
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No fault codes.
I put my OBD-1 tester on the truck and no fault codes. In both key off test and running test. So, does anyone have experience with the mlps...neutral safety switch....offered on E-Bay. The part is cheap and I can replace so no labor. I have found many references to the mlps and the problem I am having, that it’s WAY cheaper than a new transmission. Thanks for everyone’s help here.
Logistics Pro
Joined: Mar 2005
Posts: 4,698
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From: Mexico, Missouri
If you are gonna buy a new MLPS sensor, then buy Motorcraft. Don't cheap out. Not sure what is offered on Ebay. Is it NOS or something made in China? The NOS I would buy, but wouldn't touch anything other than Motorcraft.
"Spend a little now or spend a lot later".
"Spend a little now or spend a lot later".
Fleet Owner
Joined: Oct 2005
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From: Kentucky