It's hard to tell but the TPS looks like it's labelled correctly (it sits on the side on the same plane that the throttle body butterfly -- and it shaft goes through).
If you unplug the TPS, the computer will still know how mcuh air is coming into it (from the MAF) but wont know WHICH fuel map to use (The one for WOT or the one for cruising). Hence, it drives roughly because it doesn't know what is actually happening to the car (is the car accelerating or just driving at steady state at a higher speed).
The proper way to see if the TPS works is to measure the voltage from it. Use a paperclip/pin to read the voltage on the right pin from behind. You'll have to figure out which pins to use (one is ground, on is input 5V, and the other is the output signal).
At closed, it should read 0.75V or thereabouts. At full open, it should be closer to 5tV. Your car doesn't need to be running but the electrical system shoudl be on for this testing.
Right i found the diagnostic procedure here for TPS
-ok test 1, part 1 reads .88 DC volts, which is within range according to testing procedure i linked.
- test 2 , reads 5.14 dc volts, above range given in testing procedure
-ok interesting TEST 3: Ground Circuit Test fails
it read 12 volts
test i did >http://easyautodiagnostics.com/ford/...nostic-tests-2
"CASE 1: If the multimeter showed 11 to 12 Volts, then the PCM and the wire/circuit (that supply this ground) are OK.
This multimeter test result also confirms that the TPS sensor is BAD and needs to be replaced, since you have verified that the TPS is not producing a signal and does have power and ground."
but step 2 of part 1 i dont understand...
"slowly rotate the throttle manually while you observe your multimeter.
For this test result to be accurate, you need to rotate the throttle by hand and not from inside the car or mini-van.
- i dont see how to rotate it..?
also form part 2 step 1
"As the throttle opens, the voltage reading should increase smoothly and without any gaps or skips. Once the throttle is wide open, your multimeter should read about 4.5 to 4.9 Volts DC"
would this part fit my symptoms?
from dead stop to quick acceleration- car hesitates
from dead stop BUT slow accel -no problems
but at cruising speed 25 mph or so to acceleration [i.e mash the gas pedal] -no problems
also if i slow to a near stop 5-10 mph then accelerate to 30mph or so - no problems