by isuzumudman » Mon May 03, 2010 9:02 pm
As far is your TPS is concerned, $4,000 you gotta be kidding. The TPS on your vehicle is located on the top of the injection pump and is fixed with 2 screws. There are 3 wires leading to a plug. The centre wire is the potentiometer wiper and the other two are each end of the potentiometer itself. To check it I mark the position and remove it. Connect an ohm meter between the wiper and one of the potentiometer wires. Maximum resistance should be about 4.8 ohms and minimum should be really low like 0. Starting at one extreme turn the wiper very slowly to the other extreme. If the resistance fluctuates or rises sharply at any point then the unit is stuffed. You should be able to get one from a wrecker for under $100 but you must check it first. If you can, get one off a manual bighorn as they are fitted to the pump but are not actually connected to anything. Finally, the adjustment is the more anti-clockwise you turn it the less sensitive the kick down will be.
Have fun.