Video tutorial on how to test/troubleshoot and setup the throttle position sensor on a BMW. A faulty throttle position sensor in known to cause poor fuel economy, loss of power, erratic idling, high idle, and increased emissions. This does apply to the older model/style throttle position sensors, the newer models use a potentiometer. If you are removing the sensor, I would also recommend changing the two phillips screws as well because they can be easier to strip as compared to a hex head bolt or allen head bolt. This particular tutorial was done on a 1984 BMW 733i equipped with an M30.

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Tools/Supplies Needed:
-multimeter
-phillips screwdriver
-razor knife
-standard/flat screwdriver

Procedure:
-first step is the ensure the throttle position sensor is step up correctly
-with the throttle plate fully closed, open the throttle very slightly and you should be able to hear an audible "click"
-if not the sensor is either broken or not adjusted correctly
-with the throttle plate fully closed, loosen the two phillips screws and rotate the sensor all the way clockwise until you feel it stop
-do not go too far so it opens up the throttle plate
-tighten down the screws
-now retest to see if it has an audible "click", if not the switch is broken
-now testing with the multimeter, remove the wiring harness plug
-on the side of the throttle position sensor, there will be numbers
-3 (wide open throttle), 18 (input single), 2 (idle)
-using the multimeter on the ohms setting, we will be testing each plug to ensure it is working correctly
-with the throttle close, there should be continuity between pinouts 2 and 18, and an open circuit between pinouts 3 and 18
-with the throttle increased slightly, there should be an open circuit between pinouts 2 and 18, and an open circuit between pinouts 3 and 18
-with the throttle fully opened, there should be an open circuit between pinouts 2 and 18, and continuity between pinouts 3 and 18
-if the test fails, the sensor does need to be replaced
-the sensor can be opened up, although it is somewhat difficult
-using a razor knife, cut around the seam to break the glue
-then using a small standard screwdriver, slowly pry away the case
-once open, you can spray the microswitch with contact cleaner or clean the wide open throttle contacts (this is a temporary fix, I would recommend buying a new replacement sensor)

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