Removing & checking the TPS - easy?

[DOCTORBILL]

If you have been following my threads in this forum, you will see that
I have been having problems with my '93 Geo 1.0 L.

In addition to checking other things on my engine, I want to check the
Throttle Position Sensor on the left side of the Throttle Body.

The TPS is apparently adjustable in that it has two screws in long
slots on each side - it can be rotated!

The Chilton Manual says to "backprobe" the leads on the TPS and
read the resistance as you move the throttle cable. It does not
tell you which wires to backprobe!

If I were to totally remove the TPS, would it be difficult to put back on
the Throttle Body?

I don't want to take it off if some springs go flying or some spring
inside it gets loose.

If it is just connected to the other side of the throttle rod and the
rod turns a POT in the TPS, then it should not present a problem.
And graphite or wirewound Potentiometers wear out!

But I want to check with others who may have removed one w/o
having any problems.

I have to figure out why my Metro won't run properly. The TPS is
just one of many possible aspects of this.

If the weather in Spokane would just stay nice on a weekend, I
could get at this creature!

DoctorBill

[leonbentz]

Nah. No springs to go flying. It's easy to remove. Just remove the air filter, then remove the electrical connector on it. Once the electrical connector has been removed, you can then probe the 4 connectors with your digital multimeter. Place a 0.012 feeler guage between the throttle and the throttle stop adjusting screw. and probe Connector A with the Negative lead and Conecter B with the positive lead and slowly adjust the TPS counter clockwise (Very slowly) until you get continuity. Once you do, the tighten the two retaining screws. Once the screws are tight, insert 0.035 feeler guage in the throttle stop and you should get NO continuity with connectors A and B. Connector A, is obviously the connector on the far left, as you're standing on the passenger side of the car.

Once you get the adjustment set, then remove all feeler guages from throttle stop position and let the throttle stop seat all the way to the closed position. Probe connector A (-) and Connector D (+) and you should get between 4.37k - 8.13k ohms on your multimeter. Probe A (-) and C (+) and it should read between 240 and 1140 ohms. Check those same two connectors in the throttle wide open position and it should read between 3.17k and 6.6k ohms. Good luck and let us know how things go.

Leon