Transmission headaches
Thread Starter
|
New User
Joined: Oct 2021
Posts: 2
Likes: 0
Transmission headaches
'07 e350 Super Duty, 5.4 with the 4R75e transmission, 180k miles.
Hi guys, been a lurker here for a while. Here's what's going on.
Wife complained van was "driving funny." I drove it, noticed one minor slip in about 100 miles.
CEL on, p0750 p0755 codes present onlyChecked fluid, barely low, clean, no burnt smells.
Cleared codes, unhooked battery, dropped trans pan, changed filter and fluid.
Test drive, good for about 50 miles, slip once going uphill.
Took to shop. They replaced solenoid A and B as well as internal wiring harness, fluid and filter.
Van is more responsive, but codes cane back after about 50 miles, and one skull that she said was more abrupt while accelerating from 2nd to third.
Shop now says I need to replace computer because they don't know what else to do and "don't have time for it".
Any advice?
I'm pretty mechanically adept, just never worked in transmissions.
Can I run a continuity test on wiring harness? If so, can any of you point me in the right direction?
Thanks guys, looking forward to the responses.
Hi guys, been a lurker here for a while. Here's what's going on.
Wife complained van was "driving funny." I drove it, noticed one minor slip in about 100 miles.
CEL on, p0750 p0755 codes present onlyChecked fluid, barely low, clean, no burnt smells.
Cleared codes, unhooked battery, dropped trans pan, changed filter and fluid.
Test drive, good for about 50 miles, slip once going uphill.
Took to shop. They replaced solenoid A and B as well as internal wiring harness, fluid and filter.
Van is more responsive, but codes cane back after about 50 miles, and one skull that she said was more abrupt while accelerating from 2nd to third.
Shop now says I need to replace computer because they don't know what else to do and "don't have time for it".
Any advice?
I'm pretty mechanically adept, just never worked in transmissions.
Can I run a continuity test on wiring harness? If so, can any of you point me in the right direction?
Thanks guys, looking forward to the responses.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Sounds like a wiring issue alright, you need to check continuity from the trans to the PCM. Speaking of computers.. they really don't fail that often so it wouldn't be top of my list. I just went through this with my '11, it suddenly developed a no charge issue, change the alternator and same problem. Diagnostics pointed at a bad PCM but the replacement I got wouldn't work so I brought it to the local Ford dealer. They tried a few things and told me they thought it was the new alternator that was the problem, and sure enough replacing it again fixed the problem. The quality of replacement electrical/electronic parts is terrible these days.
Cargo Master
Joined: Sep 2012
Posts: 2,112
Likes: 286
From: Eastern TN
Both solenoids failing simultaneously is suspicious. Maybe Mark Kovalsky(sp?) can chime in. In other cars such faults can be caused by a tired rpm sensor in the transmission. Another possibility is a failed seal in the electrical connector to the transmission. In extreme cases ATF wicks and contaminates the transmission module. Again, I’ve read of these things on other cars.
There’s this which only lists E150 - https://ricksfreeautorepairadvice.com/ford-f150-transmission-and-others/ Annoying as all heck with all those ads but it looks like a simple fuse check
Sixto
07 E350 5.4 176K miles
There’s this which only lists E150 - https://ricksfreeautorepairadvice.com/ford-f150-transmission-and-others/ Annoying as all heck with all those ads but it looks like a simple fuse check
Sixto
07 E350 5.4 176K miles
Junior User
Joined: Aug 2021
Posts: 82
Likes: 4
I was watching a video on replacing the transmission fluid on a ford and the person in the video talked about it slipping and having weird issues cause of a slightly incorrect filter. I guess the filter is made for 2 different oil pans. One flat bottom and one that has a extended area sticking out. If you use a filter that is made for the flat bottom one it will cause weird and occasional trany slipping and hard shifting because of a slight fluid starvation. once he put in a filter that had the longer pickup tube it fixed the issues.
Just thought to give a heads up just in case. I am far from a mechanic.
Just thought to give a heads up just in case. I am far from a mechanic.
Thread Starter
|
New User
Joined: Oct 2021
Posts: 2
Likes: 0
Sounds like a wiring issue alright, you need to check continuity from the trans to the PCM. Speaking of computers.. they really don't fail that often so it wouldn't be top of my list. I just went through this with my '11, it suddenly developed a no charge issue, change the alternator and same problem. Diagnostics pointed at a bad PCM but the replacement I got wouldn't work so I brought it to the local Ford dealer. They tried a few things and told me they thought it was the new alternator that was the problem, and sure enough replacing it again fixed the problem. The quality of replacement electrical/electronic parts is terrible these days.
Thread
Thread Starter
Forum
Replies
Last Post
fordismyreallastname
Modular V8 (4.6L, 5.4L)
6
Aug 26, 2021 01:25 AM
Mark76
2004 - 2008 F150
16
Nov 5, 2017 10:40 AM
DAAJR
Clutch, Transmission, Differential, Axle & Transfer Case
9
Nov 10, 2009 11:15 AM
