Noticed this today
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Senior User
Joined: May 2008
Posts: 136
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From: the hood, Harrisburg PA
Noticed this today
I'm driving down the road and I notice when I back off the throttle, the converter (I guess) unlocks and my engine rpms dropt to idle (even if I'm coasting at 60mph)? Is this normal? I've never owned an autotrans that did this.
91 F250 Crew Cab
E4OD tranny
460EFI
91 F250 Crew Cab
E4OD tranny
460EFI
Thread Starter
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Senior User
Joined: May 2008
Posts: 136
Likes: 2
From: the hood, Harrisburg PA
I did have an issue...I picked up a picnic table for my showroom girl, and I was late for an appointment so I was chugging along on the PA turnpike at like 85...got to the shop and I was puking out tranny fluid thru the front seal/bellhousing drain plug. After I did some searches, I put in an auxillary cooler for the tranny (big *****), and brought my tranny fluid to normal while running. No trouble since. (the 2 areas I focused was over filling, and excessive temp)...cool of you to remember me tho
I'm gonna have the codes read on thursday, will follow up with what I've found....
I'm gonna have the codes read on thursday, will follow up with what I've found....
Elder User
Joined: Nov 2005
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My truck does something similar. When I'm in overdrive and take my foot all the way off the gas, after about 1-2 seconds, the rpms drop to idle. They stay at idle, until I either step on the gas, or drop below 35mph, and the tranny shifts into 3rd. It has been doing this since I got it, about 30,000 miles ago. It doesn't throw any codes, and I quit worrying about it. I can keep real slight pressure on the gas pedal to prevent the torque converter from unlocking if I want. I now consider it normal for my truck. Actually I had forgotten it was doing this until I read your post.
Good luck Frank
Good luck Frank
Lead Driver
Joined: Aug 2006
Posts: 5,670
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From: Sand Lake, MI
Nope not normal at all, my concern would be lubrication at speed. The pump is driven by the motor, not the drive shaft. So you let off the gas at highway speeds and the motor and pump drops to idle speed while the drive shaft continues to spin everything in the tranny at the higher RPM's from the high speed you are still traveling at.
Granted it has no "drive" behind it (load) and it is only during those short times but is it really getting enough lubrication while you "roll" along?
Knowing what I know about the E4OD, I'd have to go with a "no" it does not.
You likely have a coast clutch issue or a TC lock up solenoid issue or both. I'd check the wiring between the computer and tranny and if that all tests OK I'd suspect the computer itself, if it is a tranny or wiring issue the computer should give you a code for it. It's not giving you any tranny error codes with this type problem makes it somewhat suspect in itself.
The speed control itself may be faulty, It may simply not know how fast the truck is moving at different times.
How is the upshifts? harsh 1st to 2nd? and or late or very late shift/s?
Granted it has no "drive" behind it (load) and it is only during those short times but is it really getting enough lubrication while you "roll" along?
Knowing what I know about the E4OD, I'd have to go with a "no" it does not.
You likely have a coast clutch issue or a TC lock up solenoid issue or both. I'd check the wiring between the computer and tranny and if that all tests OK I'd suspect the computer itself, if it is a tranny or wiring issue the computer should give you a code for it. It's not giving you any tranny error codes with this type problem makes it somewhat suspect in itself.
The speed control itself may be faulty, It may simply not know how fast the truck is moving at different times.
How is the upshifts? harsh 1st to 2nd? and or late or very late shift/s?
Posting Guru
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i tought its was normal also... the rpms drops at idle when coasting in overdrive but overdrive off it stays at high and slows the truck down like engine braking shure its not normal with these trannys?
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Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 12
From: Sand Lake, MI
<i>the rpms drops at idle when coasting in overdrive but overdrive off it stays at high and slows the truck down like engine braking shure its not normal with these trannys?</i>
Both my trucks have E4OD's, neither one does that. Both down shift from OD at 45mph but hold the gears all the way to a stop. It is a safety hazard and they would never make it like that on purpose, be like putting it in neutral and free rolling.
When I put our 89 bronco II together with a A4LD and the wiring harness from a manual tranny b2 it did the same thing. The manual harness did not have the OD and coast clutch wires in it, I had to add them. Until I did it did not shift to OD and in drive it did exactly what you describe. It would drop to a idle when I let off the gas at all speeds. Once I added the coast clutch and OD wires from the appropriate pinouts on the EEC it then shifted to OD and then it would also hold the tranny in gear like it should when letting off the gas all the way to a stop.
One poster on a web site I read claimed "it was normal for the A4LD", no its not either.
Both my trucks have E4OD's, neither one does that. Both down shift from OD at 45mph but hold the gears all the way to a stop. It is a safety hazard and they would never make it like that on purpose, be like putting it in neutral and free rolling.
When I put our 89 bronco II together with a A4LD and the wiring harness from a manual tranny b2 it did the same thing. The manual harness did not have the OD and coast clutch wires in it, I had to add them. Until I did it did not shift to OD and in drive it did exactly what you describe. It would drop to a idle when I let off the gas at all speeds. Once I added the coast clutch and OD wires from the appropriate pinouts on the EEC it then shifted to OD and then it would also hold the tranny in gear like it should when letting off the gas all the way to a stop.
One poster on a web site I read claimed "it was normal for the A4LD", no its not either.
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Posting Guru
Joined: Dec 2006
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found this :
In 1932, Plymouth introduced "Free Wheeling" which in some respects is what Overdrive later became.
In O/D, the RPM's drop, which is exactly what it's supposed to do.
In O/D, there is less engine braking. Out of O/D, engine braking is normal.
Cruise (Speed) Control only kicks in at a certain speed, on some that's about 35MPH, just about when O/D also kicks in...so when the speed drops below that range, both O/D and cruise becomes redundant.
its normal
In 1932, Plymouth introduced "Free Wheeling" which in some respects is what Overdrive later became.
In O/D, the RPM's drop, which is exactly what it's supposed to do.
In O/D, there is less engine braking. Out of O/D, engine braking is normal.
Cruise (Speed) Control only kicks in at a certain speed, on some that's about 35MPH, just about when O/D also kicks in...so when the speed drops below that range, both O/D and cruise becomes redundant.
its normal
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 12
From: Sand Lake, MI
I guess that makes it easier than admitting something is wrong with it huh?
Safety standards in 1932 where a lot different than they are now, they learn from mistakes. "Free wheeling", the engine not having full control over vehicle speed at all times is not considered safe at any speed. They know that now, in 1932 cars where still a relatively new idea. They used to think safety belts where unsafe to use, cars where built solid so they had no give for safety, now they have crumple zones. And the list goes on.....
It is not normal.
Safety standards in 1932 where a lot different than they are now, they learn from mistakes. "Free wheeling", the engine not having full control over vehicle speed at all times is not considered safe at any speed. They know that now, in 1932 cars where still a relatively new idea. They used to think safety belts where unsafe to use, cars where built solid so they had no give for safety, now they have crumple zones. And the list goes on.....
It is not normal.
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 12
From: Sand Lake, MI
Oh and the Jasper reman, warrantied for 3 years/unlimited mileage, 2800 bucks worth of E4OD I put in my 94 has never done what you describe, so what you're saying is it was bad from the get go huh?
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 12
From: Sand Lake, MI
No not trying to be a jerk, you asked if it was normal and I stated it was not. Seams as your still looking for a way out or for someone to tell you it is normal.
I posted a little bit about what to look for, it is one of them things that could be several things or just one but could be several things together creating the problem.
You need to dive in and give it a good going over, I'd start by testing the wires. If the coast clutch wire is damaged or has a bad connection at either end it could cause the problem but it should throw a code.
Do you have a multi meter? Real handy for finding electrical problems.
If you don't have a service manual with wiring diagrams I can post them for you. Keep in mind the Haynes manual I have has proven to be wrong now and then on wire color.
Best place to look for the color to be sure is at the EEC connector at the pin # for the component you're looking at.
I posted a little bit about what to look for, it is one of them things that could be several things or just one but could be several things together creating the problem.
You need to dive in and give it a good going over, I'd start by testing the wires. If the coast clutch wire is damaged or has a bad connection at either end it could cause the problem but it should throw a code.
Do you have a multi meter? Real handy for finding electrical problems.
If you don't have a service manual with wiring diagrams I can post them for you. Keep in mind the Haynes manual I have has proven to be wrong now and then on wire color.
Best place to look for the color to be sure is at the EEC connector at the pin # for the component you're looking at.
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 12
From: Sand Lake, MI
How does the tranny shift?
The way it shifts can lead you to what's going on.
How is the upshifts? harsh 1st to 2nd? and or late or even very late shift?
If so that could be a number of things but may just mean the EEC doesn't know how fast the truck is moving.
We know from your other thread the tranny was getting hot (that was you right?), that and your coast problem leads me to think coast clutch issues.
The way it shifts can lead you to what's going on.
How is the upshifts? harsh 1st to 2nd? and or late or even very late shift?
If so that could be a number of things but may just mean the EEC doesn't know how fast the truck is moving.
We know from your other thread the tranny was getting hot (that was you right?), that and your coast problem leads me to think coast clutch issues.