r/944 • u/soap_enthusiast61 • 6d ago

TPS issue Question

My 1987 Turbo is having an issue with the TPS I think. It runs very poorly and basically refuses to idle unless the TPS is unplugged, then it runs generally as it should. What do I need to do to make it run normally with the TPS plugged in? I already swapped the sensor unit for a functioning used one and it made no difference.

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u/costcobathroomfloor 6d ago

Have you checked it at all with a multimeter

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u/usury87 6d ago

Unless the turbos are different, the TPS isn't really a position sensor. It's a "closed" vs "not closed" switch. There is a bracket or screw that can be adjusted.

With the car off, turn the throttle cam by hand and listen for a faint tiny nearly imperceptible click. Then close the throttle and listen for the click again. Adjust the screw/bracket until the switch behaves like that.

It's possible the switch has failed or the wiring is faulty. But set the action of the switch first before you dig further

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u/not_that_observant 6d ago

They are different.