It could be a very expensive repair. It could be a $5 repair. Nobody knows what it is or how much it will cost until you read the codes. There are $25 readers available that can read the codes. Some auto parts stores can read them, too.

 

Some auto parts stores can read them, too.

AutoZone, Pep Boys and Aamco transmissions used to advertise on T.V. here and because of a lawsuit can't do it in Calif. any more.

 

The O/D off light flashing is telling you that the tranny computer has stored a trouble code. Here is a link how to retrieve it using an analog volt meter. If you have a FORD OBD I code reader that will work too. get the code(s) and post back with your findings..We'll go from there.

Troublcodes.net Trouble Codes OBD & OBD2 Trouble Codes and Technical info & Tool Store. By BAT Auto Technical

 

Did you go through any deep water today?

 

Once you decide how you will recover the codes..... They are in my pics under my name... select 90 pics per page......

 

Hey Pete: remember when that link in my post quit working? glad I didn't delete it cause now it's working again.

 

check the fluid level ? could be as simple as that.but then you have to look at why.

 

So I hooked up an ODB1 Tester to the truck and put the key to the on position and it gives me a code of 23. Only thing is the code list I'm looking at says "23 throttle position sensor out of self-test range". Any thoughts?

 

Either your FIPL is out of adjustment or the truck didn't like what you did with the accelerator pedal when you started the truck. Test your FIPL.

 

got a new fps for 25 bucks, will post results soon.

 

If you didn't hold the accelerator pedal to the floor when running self test you will get a code 23. That's all it means.

 

okay, thanks, gonna try it again.

 

NOw it's giving me a code of 67 neutral/drive switch circuit open

 

Did you check the connector?

 

Okay, climbed underneath to check the connection on the neutral/drive switch and it was a little **** eyed. Reseated it and the light went away!! Thanks everyone for your help, I would have been replacing my TPS if it wasn't for you Mark!!!

 

I hate you Dodger, even though you're sitting right next to me!!!!

 

can you post pics of neutral switch plug ?
also where is the OBD 1 plug at on these trucks ? mine is a 91 F250 Diesel

 

can you post pics of neutral switch plug ?l

I don't have a photo, but it's not hard to find. It is on the driver's side of the transmission. It is the only part on the driver's side that has a wiring harness attached.

 

This is what the MLPS ( Manual Lever Position Sensor) looks like.

 

Ok I found some wires that the rats ( truck was left in the woods in Colorado ) chewed up, its on the intake manifold up front looks like its on the fuel cut off solenoid. Not sure what it is will try to post pictures can anyone tell me what it is , because one of the wires was chewed through and I jumper it with a test wire and now the blinking on OD light is out and transmission shifts fine.

 

ok trying to add pics ,, what plug do I need to order or what is this wire attached too ?

 

one more pic, at front of engine behind tack plug but not tack ?

 

looks like it may be : Standard Motor Products S674 Throttle Position Sensor Connector