92 Ford F350IDI Speecometer problems
Thread Starter
|
New User
Joined: Jan 2015
Posts: 8
Likes: 0
From: N.E. Houston TX
92 Ford F350IDI Speecometer problems
I have a 92 F350 7.3 IDI that I have been trying to bring back to life after sitting for several years. I have replace several items including Injector pump, injectors, glow plugs, Glow plug realay (still not working correct), alternator, starter, Batteries, and Radiator so far. I can not get my Speedometer and odometer to work and my transmission shift hard and downshifts early. I have replaces the DSS or VSS on the rear end and have checked voltage and I have 0 to a little over 1.01 on plug under the hood. I have read tons of posts and am only getting confused on the troubleshooting. I am not sure what to next since my voltage is low and not at the 3.5. I have read tons of posts from SUBFORD and was looking for help troubleshooting this problem. Any help would be appreciated.
Thread Starter
|
New User
Joined: Jan 2015
Posts: 8
Likes: 0
From: N.E. Houston TX
Ok with RABS plugged in I get around 2.2 VAC at about 2k rpm with trans in Drive truck jacked up. With RABS unplugged I get about 4.2 VAC at about 2k RPM with trans in Drive and truck jacked up. I still do not have speedometer reading or ODOMETER reading (blank lcd). Thanks for all the help so far!
Fleet Owner
Joined: Aug 2005
Posts: 23,668
Likes: 301
From: Easton,Ks
Yes it sounds like a bad PSOM. Also check the safety diode on the boards input power. I have them fall off the PSOM board. It is a surface mounted diode on the board to protect the board if someone hooks up the battery backwards or the jumper cables backwards.
You can pick up a PSOM at a salvage yard and have somebody with an EPROM burner just copy you old mileage from your old EEPROM and setup to the new boards EEPROM and change the change number back to 6.
You can pick up a PSOM at a salvage yard and have somebody with an EPROM burner just copy you old mileage from your old EEPROM and setup to the new boards EEPROM and change the change number back to 6.
Thread Starter
|
New User
Joined: Jan 2015
Posts: 8
Likes: 0
From: N.E. Houston TX
will this fix the hard shift? how can I check to see if I am getting a good one? Is there someone I can send this to "somebody with an EPROM burner just copy you old mileage from your old EEPROM and setup to the new boards EEPROM and change the change number back to 6. " Thanks for all the help.
Trending Topics
Fleet Owner
Joined: Aug 2005
Posts: 23,668
Likes: 301
From: Easton,Ks
Yes if the replacement PSOM has a good input from the VSS wire.
Hard to say. I take a 9volt battery with a PSOM plug on it and do the prove-out on the PSOM/speedometer head and check the display before I buy it.
A lot of electronic hobbyist can do this and most know at least one with one.
There are also places you can send the PSOM to that will fix or send you back another one.
Hard to say. I take a 9volt battery with a PSOM plug on it and do the prove-out on the PSOM/speedometer head and check the display before I buy it.
There are also places you can send the PSOM to that will fix or send you back another one.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Fleet Owner
Joined: Jul 2006
Posts: 20,389
Likes: 850
From: Mi'kma'ki
you really should park the truck.your transmission is operated electrically.it needs to know your vehicles speed via the PSOM in order to know when to shift.it's extremely hard on the trans to drive it like that.
this is why it's shifting hard......it's blind without the vehicles speed.it can't see what the vehicle is doing.
Thread Starter
|
New User
Joined: Jan 2015
Posts: 8
Likes: 0
From: N.E. Houston TX
I have only drove the truck maybe a mile since getting it running, I am going to send the cluster off to get fixed, I don't need the truck running right now and am just working through all the problems.
Thanks to everyone for all the help it has been greatly appreciated!!! I will post after new cluster arrives. Thanks again!
Thanks to everyone for all the help it has been greatly appreciated!!! I will post after new cluster arrives. Thanks again!
Thread Starter
|
New User
Joined: Jan 2015
Posts: 8
Likes: 0
From: N.E. Houston TX
Speedometer works fine now, transmission shift a little early now and I have instructions on how to calibrate just need some some time to work on that now thanks for all the help on this everyone. I just need to fix some broken plastic from previous owner on the back of the cluster trim piece if someone has an idea.
Thanks again.
Thanks again.
Thread
Thread Starter
Forum
Replies
Last Post
drs1023
1987 - 1996 F150 & Larger F-Series Trucks
4
Apr 5, 2016 03:35 PM
red97stroker
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
12
Aug 30, 2013 03:55 PM