Possibly PSOM? Intermittently shifting hard.
Thread Starter
|
5th Wheeling
Joined: Jun 2018
Posts: 26
Likes: 0
Possibly PSOM? Intermittently shifting hard.
Hey guys, I have a concern about my truck. I have a 1997 Ford F350 7.5 liter. (460). I've been experiencing intermittent shifting issues, it would happen randomly when I'm driving or turning. The issue is the transmission has trouble shifting through all the gears when it happens, it will rev way up and then it will shift hard. Sometimes the speedometer and odometer will shut off, sometimes it stays on. The overdrive light would be blinking when it happens. When the issue occurs, I would whack the dash above the instrument panel and both the odometer and the speedometer would come back to life (if it's not displaying) and the truck would be shifting normal again. My radio/head-unit would also reset when I give the dash a good whack. Could it be a grounding issue, exposed wire, or connection issue?
I replaced the VSS about 8 months ago I believe, I'll check again to see if it's still alright. I also had the PSOM checked out, according to shop they said that it was alright ( I don't think it is, or connection wise). I am hoping to here what you guys think. Thank you.
I replaced the VSS about 8 months ago I believe, I'll check again to see if it's still alright. I also had the PSOM checked out, according to shop they said that it was alright ( I don't think it is, or connection wise). I am hoping to here what you guys think. Thank you.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
Sounds like you are losing power to the PSOM board and the radio. May be the plug connectors are bad.
PSOM have had parts that have broken away from the board and just touching to cause this also. Most of the this is the power input diode on the board. You say you have had the PSOM board checked out so they should have seen this if this is the case.
It also sounds like you have another problem at the transmission. Could be a bad TR sensor or if you have 4X4 you might have a non 4X4 filter in it or the filter has dropped.
PSOM have had parts that have broken away from the board and just touching to cause this also. Most of the this is the power input diode on the board. You say you have had the PSOM board checked out so they should have seen this if this is the case.
It also sounds like you have another problem at the transmission. Could be a bad TR sensor or if you have 4X4 you might have a non 4X4 filter in it or the filter has dropped.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
Thread
Thread Starter
Forum
Replies
Last Post
Pete Hamstra
1994.5 - 1997 7.3L Power Stroke Diesel
2
May 25, 2019 02:31 AM
paintubturner
1994.5 - 1997 7.3L Power Stroke Diesel
6
Mar 31, 2017 08:48 AM
96_Powerstroke
1994.5 - 1997 7.3L Power Stroke Diesel
9
Dec 22, 2014 09:03 AM
tr0y
1978 - 1996 Big Bronco
5
May 21, 2005 10:29 PM
