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Discussion Starter · #1 ·
My TPS appears to be out of wack. When I push the clutch in to shift, the RPMs shoot up and stay there for a few seconds, sometimes much longer. I cleaned my IAC and it is ok. How do I test my TPS and adjust it if neccessary? Or is the TPS non adjustable? I also heard that it might be the Voltage Regulator but I don't think it would be the culprit since the high idling occurs when the throttle is pushed and released and when the clutch is pushed in.
Thanks,
BT
 

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Usually it's the TPS. To test it, hook a Digital volt meter to the wires on the TPS. I think one lead goes to the green wire, the other to the black (could be wrong on the colors--been too long since I messed with one). At idle it should read just under 1.00 volt.

Now, if you don't have a digital VOM, you can use an analog VOM to test the actual "sweep" of the TPS. Actually, it's probably better because it shows what's going on with the "wiper" inside the TPS. It's easy. Just probe the wires as described. Then move the throttle slowly and watch the needle on the VOM. It should be linear and smooth. If it jumps around or rises then falls off drastically, you know your TPS has a problem.
 

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Probably the IAC. You can`t usually SEE an IAC problem. Cleaning them doesn`t usually do a damb thing to revive a shot one. What year is the vehicle?
 

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I've experienced more "surges" with TPS sensors than any other type of issues. Your IAC motor sounds like it's not closing as quickly as it should... The IAC motor opens and closes as per Idle and driving requirements, and the rate it opens and closes depends on the signal coming from the PCM, your's sounds slow to close.

FE
 

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Discussion Starter · #5 ·
My Ranger is 95 model. I disco'd the IAC and it idles low enough for me to stand but the hanging is still present. It just hangs at a tolerable rpm. I have no idle problems, but I think I merely bandaided the problem. I replaced the TPS before I disco'd the IAC and it didn't make any difference.
Thanks,
BT
 
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