Throttle position sensor

Z

ZappyBear

Member
Well, tested my TPS after having my ranger hesitating on acceleration. Turn out fuel pump is weak, 5psi under minimum value at idle and drainback is pathetic. Goes back to 0psi in 20 seconds. Anyway, I found some weak points doing a resistance test on it, couldn't do a voltage test as the battery is in my f150. I couldn't tell you the exact wires I was on, but the resistance climbed until 1/2 throttle then started dropping in resistance. WOT ended up having less resistance than idle. Is this normal?
 
Just did a voltage check on the sense wire, It's normal, but still jumps a little. Found out I had the probe between sense and ground. The real issue ended up being porcelain on spark plug cracked, 4th of july party in my engine bay didn't show up until last night.
 
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