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If you're certain you have a TPS that's messing up, giving it a bath seems like a good alternative to placing an order. I never dreamed these things would become as expensive or hard to find as this thread implies.
Just to be sure, I checked one of the spares I have to see if I could open the snap-together housing and get closer to the Microswitch inside. In addition to the snaps, I found a bead of hard (epoxy?) sealing the two halves together, and in deference to the value these things have apparently acquired, declined to risk its destruction. I don't have a switch deemed "bad" or I'd bust it apart just for the pics.
As for adjustment, I believe the feeler gauge at the stop screw should be sufficient to keep even a worn switch from landing on the hairy edge at closed throttle. Usually this is compounded by deposits on the throttle plate and wear in the shaft as the car ages well beyond the service life anticipated by the techs who wrote up those green service manuals before even the first of them appeared on the market.
Philosophy, rather than recipe, should be that you want the idle to be regulated when your foot is off of the pedal, and switched out of regulation before the throttle opens wide enough to inch you forward in a hot traffic jam. Yet I understand the need for recipes.
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Art Benstein near Baltimore
If you think nobody cares if you're alive, try missing a couple of car payments.
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