rusefi.com

Stihl has EFI chain saw and concrete saw.

Is that a 35ohm injector with peak&hold at 50volts?!



unfortunately my source of part photos is eBay "STIHL MS 500i MS500i Fuel Injector "

Interesting, some are clean some are dirty.

Position sensor seems to have blue plug (see first post for eBay photo) with three wires, one position unused.

Fun fact - unused position is what I believe is ground. So, ground pin is not used by position sensor - neither of the three used wires are buzzing to "power" ground.

Voltages are measured against that unused ground pin.

First scope is against that unused power ground

Two other scopes are using are with alligator clip on one of the three wires more or less randomly. All data captured while saw is running.