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On second look at the photo above, comparing the early switch's boss for the actuator rod with the later switch without any boss, it's possible that the boss could limit the plastic rod from fully or always completing its required travel.

YMMV

What will it take for brokencase to ask this expert for his take on cause and solution to SHIS?

viewtopic.php?f=19&t=33259

YMMV

Metal vs. Plastic rod is insignificant; I'll bet that XR and Scorpio door microswitches have plastic rods or buttons. What likely matters most is whether the internal activation point is different between the two.

YMMV

Sheesh.

Ford provided new Scorpio.TPSs with gold plated terminals. Not so re Ranger stuff with regular naked metal of some sort. Scorpios merited top-notch service/repair consideration.

I installed a Ford one re dealing with Sudden High Idle.

YMMV

Limp Home mode doesn't allow engine to rev higher than modest rpms. Limp Home mode also allows operator to feather rpms from base idle up to the L.H. limit. In Sudden High Idle operator can raise rpms above the high idling point if needed (but in most cases operator shuts off engine and restarts it ...

Congratulations! Scorpio Ownership initiation rites have begun.

There are posts about this phenomenon in Scorpio and in XR sections. New TPS didn't resolve issue in Scorpios, but seemed to in an XR.

YMMV

'89 S.M.: With doors unlocked, when button is pushed it should depress microswitch which then powers the solenoid. So if you have the liftgate underpanel off to see what takes place, when depressing the button that should depress the microswitch sufficiently to power the solenoid. If it doesn't, eit...

Re Ohming/resistance switch testing. Infinity reading = a gap between metal contacts. Any reading of resistance = at least some metal contact, but not necessarily proof that necessary amount of current for operation of device can flow at that contact. Try hot wiring or jumping the switch contacts. Y...

Can't remember specific examples ATM but I've encountered a few electrical items (on cars or elsewhere) that ohmed OK but didn't operate as designed.

Since you have an '89 parts car, swapping one from it is worth trying.

YMMV

Seems you verified power at the liftgate lock switch, verified that solenoid actuates when given power separately, but when both are connected and the switch is depressed the solenoid doesn't operate. So even with the switch seemingly testing OK (for on/off ohms) the switch itself may be the issue. ...

Validation? The Scorp Saginaw whined; my two XR's pumps never whined. QED.

So if quieting XR p/s whine is the quest the Occam's Razor cure is a dose of ~$7 LubeGard additive.

YMMV

Stop whining ().

https://shop.advanceautoparts.com/p/lub ... 11289452-P

It stopped the "morning sickness" on my Scorpio p/s ~long time ago.

YMMV

Buy a couple Dollar Store foil sun screens. Put one over the rear seat tops when parked; put another (or two) on seat leather that gets sun exposure.

YMMV

Purpose was a good laugh. The text quotes the Mayor saying the cop made a really bad decision. It's clear as hell the perp made really bad decisions in series (10+ priors, warrant for non-payment of child support). Then the laugher topper was the choice of rims (financed with back due child support ...

What about the XR pump is so hateful...to you?