E40D revving problem
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Junior User
Joined: Jul 2005
Posts: 68
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E40D revving problem
My 92 F150 with a 4.9 liter six was being driven back on a long highway trip today. Suddenly, the engine revved up like I had accidentally shifted the truck into neutral, then corrected itself and I was driving along normally again. I was doing about 70mph, all my gauges read normal, and I was maintaining a constant speed. About 2 hours later, it did the same thing. Otherwise, the truck seems to run completely normally. there are no leaks, the tranny fluid looks normal. Is my transmission about to do something bad?
Transmission Rebuilder
Joined: Jul 2008
Posts: 1,569
Likes: 62
From: North Georgia
You may have a MLPS (Manual Lever Position Sensor) that is failing. You would need a scanner to catch it when it acts up. Its a cheap enough switch to just replace it and see.
Some people in the auto parts world might call it the neutral safety switch.
Some people in the auto parts world might call it the neutral safety switch.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,703
Likes: 2,624
From: SE Florida
Yep, I've fixed several that did this exact thing. Sometimes you can catch it in the data, sometimes you can't. Just replace it.
Senior User
Joined: Feb 2010
Posts: 238
Likes: 0
From: Harford County, MD
I have a 93 E350 Club Wagon with the E40D/4R100 transmission. Mine has been doing this for at least a year and a half probably more. I'll be driving along and it will rev up as if in neutral and then slam back into gear. Sometimes I can go for days, even a week or two with no issue then I get in the next day and it does it 15 times that day??
I just found out I have to have the rear main seal replaced and I was going to replace/rebuild the tranny while out but if this is possibly the problem it would save me a whole lot of money!
Any thoughts?
Thanks, Tom
I just found out I have to have the rear main seal replaced and I was going to replace/rebuild the tranny while out but if this is possibly the problem it would save me a whole lot of money!
Any thoughts?
Thanks, Tom
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,703
Likes: 2,624
From: SE Florida
It is an E4OD transmission. The first 4R100 was several years after your truck was built.
Rebuilding the trans will not fix this problem. That is unless you also replace the TRS on the side of the trans. It is worn out. A new one is about $40 at any parts store. It is sometimes called the MLPS or NSS.
Rebuilding the trans will not fix this problem. That is unless you also replace the TRS on the side of the trans. It is worn out. A new one is about $40 at any parts store. It is sometimes called the MLPS or NSS.
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Senior User
Joined: Feb 2010
Posts: 238
Likes: 0
From: Harford County, MD
It is an E4OD transmission. The first 4R100 was several years after your truck was built.
Rebuilding the trans will not fix this problem. That is unless you also replace the TRS on the side of the trans. It is worn out. A new one is about $40 at any parts store. It is sometimes called the MLPS or NSS.
Rebuilding the trans will not fix this problem. That is unless you also replace the TRS on the side of the trans. It is worn out. A new one is about $40 at any parts store. It is sometimes called the MLPS or NSS.
Thanks for your help! Any chance you could expand on those abbreviations? I checked with Napa and they say the don't have anything for my van that matches those letters?
Thanks again,
Tom
Also, I am looking at a rebuilt trans in case I need to go that route. It is out of a 1991 F150 2wd. The only difference I can see between it and mine is the "tailpiece"(?). Would it be as simple as swapping the tailpieces to make that trans work in my 93 E350?
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Senior User
Joined: Feb 2010
Posts: 238
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From: Harford County, MD
Appreciate it! They finally figured out what the part was, now I just hope it works and saves me from having to spend $1k on a rebuild!
Senior User
Joined: Feb 2010
Posts: 238
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From: Harford County, MD
Well I could have told you it wasn't going to work for me. Had the new NSS put in yesterday and nothing changed.
I found a used transmission for $700 OBO with 10k miles on it but can't figure out for sure if it will fit my van. It is out of a 1991 F150 2WD; my van is a 1993 E350; both have the 5.8. When I checked the fitment guide on Napa, it says that transmission only fits E350 up to 1992? When I compare pics of the 2 side by side the only difference I can see is what I refer to as the "tailpiece". Can the tailpieces be swapped if the transmission itself is the same?
(Mine):
(Used one):
I found a used transmission for $700 OBO with 10k miles on it but can't figure out for sure if it will fit my van. It is out of a 1991 F150 2WD; my van is a 1993 E350; both have the 5.8. When I checked the fitment guide on Napa, it says that transmission only fits E350 up to 1992? When I compare pics of the 2 side by side the only difference I can see is what I refer to as the "tailpiece". Can the tailpieces be swapped if the transmission itself is the same?
(Mine):
(Used one):
Transmission Rebuilder
Joined: Jul 2008
Posts: 1,569
Likes: 62
From: North Georgia
Replacing your transmission and having the same problem is a real possibility.
Cargo Master
Joined: Jun 2003
Posts: 2,982
Likes: 7
From: Somewhere Saskatchewan
I would encourage you to take your vehicle to a shop that is familiar with that transmission and knows how to use a scanner. Have them determine if you have a transmission problem or a control problem.
Replacing your transmission and having the same problem is a real possibility.
Replacing your transmission and having the same problem is a real possibility.
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