91 Ranger 4.0L

[flynow]

I've been told to check the TPS on the truck. How is this done?

[mrshorty]

IMO, the first step would be to pull codes, to see if the computer sees a fault in the TPS.

TPS is a simple potentiometer. Basic test procedure is to put an ohmmeter on it and see if the resistance changes smoothly across it's range of motion. You'll want a wiring diagram so you can properly identify the three leads.

[flynow]

thanks alot for the help. there isnt any way to pull codes because shops arnt carring the ob1 anymore

[Lead Head]

OBD-1 is easy

http://fordfuelinjection.com/?p=13