I'm getting 4.7V out of the signal wire (unplugged) as well. Did you find what was causing it? My Clockspring is unplugged from everything except for the horn, it is wired to a button placed at the side of the steering wheel.
No matter how many times I replace the TPS, they keep eventually failing.
3rd one. Diferent brands, but same results. They start fine but in les than a week they start failing.
Current one is Standart, and is still working with the idle issues.
I was having a similar problem with my 98 XJ, it was just randomly dying no matter what I did.
Turns out it was the ignition coil wiring. The conector was worn out. Replace both the coil and conector.
Problem solved.
Check those wires before changing other sensors just to be sure they're ok.
Hey there
I have an auto XJ '98 4.0L and i've been having issues with the idle.
It idles around 1500-1600 rpm in park and neutral. And it goes down to 700-800 in drive and R.
recently rchanged the TPS and the idle Was fine, until few days ago started to go up again whe put in P and N.
IAC...