*NON MM* TPS question. Help!

[OneBADLsE]

Today i scratched an inch ive had for quite a while. I had a feeling my problem with throttle response on my 1982 Lincoln Mark VI was due to a failing TPS.

I got to measure the voltage, and was perplexed to say the least.

Closed position voltage was at 2V! WOT position was at OVER 7 volts! The sweep performed was smooth and direct all the way to 7V's. No deadspots whatsoever.

However, when trying to adjust the voltage i had some interesting things occur.

One of those things were when trying to calibrate it, the voltage at one point went as low as 1.5V. When at that position (that was the lowest it could go. ANYTHING below 1.5V was a deadspot. No matter how much i wiggled it, nothing would happen for it to even go below 1.5V), i proceeded to start the car and give it gas. <<Choke choke, POPP!!!!>

:whoa: I quickly shut the car off and said to myself "ok that didnt sound good"!

When i went back to take a look at the voltage, it was OVER 3.5V at closed throttle!!! :::WTF!:::

Any ideas what could be causing that?????


Thanks in advance,
Len

[larryo340]

If it's original I bet it is worn, new one should be pretty cheap. I'd start there.
keep us posted

[JMan]

YO!
You're messing with an EEC-III system that works on 9 volts reference and not 5. Two to seven may be normal. The sudden jump to 3.5 may be a sign of a bad ground. Start doing voltage drop tests everywhere from the negative post of the battery. All ground circuits should read below 100mV. One of the diagnostic connector pins is the signal return (black wire with white tracer). That is a good indication of the ground circuits' health. Again that should be below 100mV.

Best luck (Or God help you!)

J

[OneBADLsE]

YO!
You're messing with an EEC-III system that works on 9 volts reference and not 5. Two to seven may be normal. The sudden jump to 3.5 may be a sign of a bad ground. Start doing voltage drop tests everywhere from the negative post of the battery. All ground circuits should read below 100mV. One of the diagnostic connector pins is the signal return (black wire with white tracer). That is a good indication of the ground circuits' health. Again that should be below 100mV.

Best luck (Or God help you!)

J

That was actually VERY VERY HELPFUL! I wasnt aware that they worked off of 9V.

Then, that would actually explain why it worked better in the 2V range than the 1.5V range. There is a manual online that MeninBLK reffered me to that explains how to diagnose an EEC-III system. For $8, i better pick it up!


And yes, MAY GOD HELP ME:help: