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Car Forum / Porsche / Porshe 944 / November 2004Throttle Position Sensor?
My 944 idles high and as everything else is in good shape and it only happens *after* the car is warmed up, I think it's the TPS. It bugs me that everything I've read simply says to replace it, but doesn't say what goes wrong with the old one. Anyone know what causes them to fail after a mere 150k miles? ;) If the part can't be fixed or is so cheap repairing it doesn't make sense compared to replacement that's one thing, but I don't like just swapping parts willy-nilly. Emanuel  Signature1983 Porsche 911 Guards Red/Black 1983 Porsche 944 Guards Red/Black 1983 Porsche 928 Guards Red/Black TPS units are just a rheostat, with increasing resistance through the range of movement. If you want to do some sort of bench test, you can use an ohm meter and look for a smooth increase of resistance as you move the TPS actuator. (realisticly you may not be able to see if your TPS is just a little off, only if it has "dead" spots) Usually they fail due to a change of resistance in certain positions like at idle (where the sensor sits *most* of the time) it just builds up resistance at the point of contact on the resistance coil. Why do you think the TPS is the cause of your high idle? I usually see the cause a flat spot (fall on your face off idle). Bernard the TPS is both a switch and a rheostat ( potentiometer), it is the switch that goes bad >TPS units are just a rheostat, with increasing resistance >through the range of movement. If you want to do some [quoted text clipped - 12 lines] > > You need to check your vacuum lines for leaks and be certain there is an O ring on the oil filler cap. the microswitch inside the TPS goes bad, the contacts wear out.... > My 944 idles high and as everything else is in good shape and it >only happens *after* the car is warmed up, I think it's the TPS. It [quoted text clipped - 6 lines] > Emanuel > why do you think it's the switch and not a vac leak or a sticky air bleed valve? I don't know the 83s well, but I'd start by looking at those factors > My 944 idles high and as everything else is in good shape and it > only happens *after* the car is warmed up, I think it's the TPS. It [quoted text clipped - 5 lines] > swapping parts willy-nilly. > Emanuel |
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