btw how do i check the TPS to see if its bad? and if its not what do i need to do to make sure its adjusted right?
This is the reason the zoo forum is so cool, somebody somewhere knows the answer, or how to find the answer to most Isuzu questions.
On the 2.6L with 5spd, the TPS is very simple. It has two internal switches and three connecting wires. The TPS is connected to the ECM and sends it three different signals.
1) Idle: with the throttle valves closed.
2) Off-idle: with throttle valves opened.
3) WOT: wide-open-throttle with valves completely open.
Here are some links to FSM pages that cover the adjustments: these were provided by isuzufool.
Here is where the TPS is located. It is mounted on the throttle valve shaft and that shaft opens and closes the switches as it turns. A: is the hold-down screw. Loose this to adjust the TPS. B: is the electrical connector on the TPS.
MarkB.NV, Silver '90 Trooper, 2.6L, 5spd, 204K mi. Blue '89 Trooper, 2.6L, 5spd, 242K mi.