Throttle position switches
Tested ohm meter to itself = OK
Idle throttle switch: Off throttle = 0 ohms. On throttle = infinite.
Tested multiple times. Same results.
Full throttle switch: Partial throttle = infinite. Full throttle = 0 ohms.
Tested multiple times. Same results.
Checked positions of throttle plate…
No play in throttle cable when plate is closed.
At full throttle, plate looks & feels 90 degrees to throat. This is when moving the throttle lever by hand. Still need to get a person flooring the gas pedal to see where this goes. EDIT: Just did this. Pedal floored = fully open throttle plate (butterfly.)
Opened full throttle switch…
Bosch part # 0 280 120 309. Looked around just in case mine was bad. Amusing price range... $60 to $677 for a "genuine" part.
When should these points close?… According to those looking at Bentley, it's at 100% throttle. I assume this being relative to the throttle's rotation from 0 to 100% and not a measure of pedal movement. Bosch Motronic book I have offers no spec. Only says “loosen the screws to adjust.” Steve Wong says "You need to see continuity on the upper two pins after 3/4 of full throttle. Without it functioning, you will stay in part throttle mode, and never go to full throttle mapping. The difference is 20 hp or more." This quote is from
https://forums.pelicanparts.com/porsche-911-technical-forum/452398-checking-wot-switch.html post #4.
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