2005 Ford Expedition transmission problems
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1st Gear
Joined: Jul 2023
Posts: 1
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2005 Ford Expedition transmission problems
Good evening, I have a 2005 Ford Expedition Eddie Bower 4x4 I recently bought and it seems to have a bad torque converter or transmission. It is throwing no transmission codes and the symptoms are as follows. When taking off in drive, whether I am in the manual 1-2 gears or D I have to rev the engine before it jolts and then gets going. When driving in D it will drive decently, minding the rough shifts until I let off the gas. As soon as I let off the gas it seems to disengage the clutch on the torque converter because the engine will rev when i give it gas but barely put any of it down. If I want to continue I either have to stop and restart or put it in the manual gears at which point it drives fine, albeit, it still has a rough start. Reverse works fine. I see no fluid under the car at all. I have not pulled the pan off the trans to check for shavings. It is throwing PO174 lean codes which I dont see having a correlation to the transmission but what do I know. If anyone could point me to a thread in which someone had the same problem or help me diagnose either the code or my tranny problems it would be very much appreciated.
Cross-Country
Joined: Mar 2020
Posts: 57
Likes: 9
From: Kalispell, Mt
Going on a limb here, as my rebuilt transmission was having issues (different from yours)..... I found out I had a pretty serious vacuum leak. I had the same lean condition code. Make sure your intake boot is tight on the throttle body, and all your vacuum lines are good. not sure the how or why, since I dont think they are connected, but it solved all of my shifting issues.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,725
Likes: 2,651
From: SE Florida
Here is the way to find out what broke inside your transmission: Take it out and tear it down. It's done. It needs to be rebuilt or replaced. There is no easy fix for this. Sorry.
It is NOT the torque converter, it is the transmission.
It is NOT the torque converter, it is the transmission.
Super Moderator
Joined: Aug 2003
Posts: 25,479
Likes: 742
From: Isanti, MN
I've never heard of anyone resolving engagement issues like that with anything less than a rebuild. Low fluid can cause disengagement as well, but you'd see evidence because it doesn't just disappear. The vacuum leak can't have anything to do with it.
Just out of curiosity, what does the maintenance history look like? How many miles, and has the fluid ever been changed?
Mountain Pass
Joined: Aug 2019
Posts: 151
Likes: 3
From: Poland
I have almost the same problem i my Range Rover Classic in ZF transmission. I can start only with higher rev from 1 and 2 and after wheel spinning take D. If I stop or move slowly I need to start one more time with 1 or 2 with higher revs. R works normally.
Problem was mechancal. Crack some part inside. I change transmission because was cheaper than rebuild.
My problem was started when I put D from N on high engine revs.
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