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Originally Posted by Trevor
If every time you set it, it changes the wiper and resistace element contact is intermittent. ( Unless there is a faulty connection.) This a positive indication of a fault.
Inside there is a rotary potentiometer comprising a conductive plastic element around which a wiper turns. Unfortunately the thing can not be taken apart and it is difficult to get cleanibg fluid into it. You could try completely immersing it while turning it. CRC type fluid would be best. It is not possible to accurately measure minor contact interruptions without a scope, or meter with a bargraph instant response read out.
Best of luck, but you may be stuck with purchasing a replacement.
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Actually trevor the thing can be taken apart and put together although rather ugly afterwards. The tps is not my problem by itself, there has to be either a wire or something else that is causing my problem. Here are a couple of pics of the TPS apart.