Back To Idle?
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Junior User
Joined: Nov 2010
Posts: 89
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From: South Illinois
Back To Idle?
I have a 96 F-350 with the E4OD automatic trans. It will shift on thru the gears and into OD by 45 or 50 mph if you are just driving normal. Then if driving around say at 55 mph if you let off the throttle it will fall back to just above idle rpm and it feels like the trans goes into neutral. If I take OD off and then let off it feels like it is still in gear and the rpm stays up like it should.
I have also noticed that when pulling heavy load when you let off the throttle that the trans temp will jump up.
Does anyone have any ideas?
thanks RB
I have also noticed that when pulling heavy load when you let off the throttle that the trans temp will jump up.
Does anyone have any ideas?
thanks RB
Fleet Mechanic
Joined: Nov 2006
Posts: 1,952
Likes: 1
From: Knoxville, TN
I have a 96 F-350 with the E4OD automatic trans. It will shift on thru the gears and into OD by 45 or 50 mph if you are just driving normal. Then if driving around say at 55 mph if you let off the throttle it will fall back to just above idle rpm and it feels like the trans goes into neutral. If I take OD off and then let off it feels like it is still in gear and the rpm stays up like it should.
I have also noticed that when pulling heavy load when you let off the throttle that the trans temp will jump up.
Does anyone have any ideas?
thanks RB
I have also noticed that when pulling heavy load when you let off the throttle that the trans temp will jump up.
Does anyone have any ideas?
thanks RB
My 97 would pause and hold the rpm range for about 30 seconds and then would drop like what seemed to be neutral too....
I will note that mine is now in the shop for a trans rebuild.
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Junior User
Joined: Nov 2010
Posts: 89
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From: South Illinois
I forgot to mention that I do have 2 aftermarket trans coolers 1 small and 1 larger one.
What is a TC?
I am running about 1500 rpm at 55 mph.
What is a TC?
I am running about 1500 rpm at 55 mph.
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Hotshot
Joined: Dec 2006
Posts: 14,069
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From: Melbourne, Ky
TC=Torque Converter, Torque Converter Clutch. 1500rpm's at 55mph may not be fast enough to keep the torque converter clutch engaged. I know my 97 acted just as Lee describes. The TCC would stay locked in going down a hill at 60 or so mph, but after 30 seconds, it would unlock. My truck had 4:88 gears in it though, and would run at 2600rpms at 70.
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Junior User
Joined: Nov 2010
Posts: 89
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From: South Illinois
What can I do to fix this replace the TC? My truck has 3.55 gears. When pulling heavy loads my truck will run in the yellow on a B&M gauge and when I let off and it coasts it will jump up in the red, but when I get back on it it will start cooling off.
thanks RB
thanks RB
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Junior User
Joined: Nov 2010
Posts: 89
Likes: 0
From: South Illinois
How could this problem be connected to the brake light wiring?
Hotshot
Joined: Dec 2006
Posts: 14,069
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From: Melbourne, Ky
Does your truck drop to idle speed instantly once you let off the pedal? Or does it take it a while like 20 to 30 seconds? How does it operate at 65 or 70 mph?
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Junior User
Joined: Nov 2010
Posts: 89
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From: South Illinois
at 55 mph it drops back to just above idle instantly, when I am running at 70 75 it drops instantly also but only drops back to about 1000 rpm. I am not touching the brake just letting off the throttle. And as soon as I let off you can see the trans temp go up.