yo!
Let's get the TPS testing confirmed First.
Response Graph; "...This voltage is measured with the TPS connected normally, the key in RUN, the black meter probe on the SIG RTN wire (Bk/Wh or Gy/R), & the red probe on the TP (DG/LG or Gy/Wh) wire. BEFORE attempting to adjust the TPS idle voltage, confirm that the throttle stop ***** has not been tampered with..." Source: by Ford via Steve83
You prob have the Green wire as shown in this pic by Ric in his 92;
Check for corrosion on connectors
To minimize the replacement of good components, be advised that the following non-EEC areas may be the issue:
Excessive blow-by
PCV malfunction
Vacuum leaks
Fuel pressure
Throttle sticking or linkage binding.
Many conditions can be caused by loose, dirty, oxidized, or poor connections that may correct themselves for a short time if the connector is disturbed during testing. This can mislead technicians into replacing a TPS that is okay, and the true cause, a bad connection, may return at some future time.
Measuring the TPS voltage at idle is key when diagnosing a TPS since most of its operational life is within 10 degrees of idle
CAUTION:
MANY VOLTMETERS WILL AUTOMATICALLY CHANGE RANGES WHEN MEASURING TPS OUTPUT FROM IDLE TO WOT. WHEN A VOLTMETER IS USED TO MEASURE TPS OUTPUT FROM IDLE TO WOT, THE METER SCALES OR CHANGES RANGES AUTOMATICALLY. THERE MAY BE AN ERRONEOUS METER DISPLAY UNTIL THE VOLTMETER HAS LOCKED TO THE APPROPRIATE VOLTAGE READING. THE ERRONEOUS METER DISPLAY DOES NOT REPRESENT A DEFECTIVE TPS.
NOTE: IT IS RECOMMENDED THAT THE "RANGE LOCK" FEATURE ON MANY METERS BE SET FOR CHECKING TPS VOLTAGE.
Use the 0.00 range to measure TPS voltage.
If your voltmeter does not change ranges automatically and the meter is set to millivolt scale when reading full range voltages, the meter display may not indicate a valid value. This can be misinterpreted as an open circuit or suspect TPS. Ensure the meter is set to volts for measuring full range voltage levels.
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Also do a Self Test; by BroncoJoe19
Warm engine up.
Turn off all accessories, lights etc.
Shut engine down
Do KOEO portion first
Remember to have engine @ Normal Operating Temperature before doing the KOER portion
Testing & Operational Description & Parameters Source: by Ryan M (Fireguy50) at fordfuelinjection.com
