Hi all,
Here is the problem...
Car is a 1969 911E (2.0 liters with MFI) which was completely rebuild.
The only thing that was not working was the RPM Transducer (also called the Speed switch I guess).
So I bought a new one :
When I test the transducer it's ok : I put 3000 rpm, press the microswitch and the rpm oscillate between 1300 and 1600.
When I stay at idle, after a few seconds 12V is intermittently sent to the shut off solenoid and the engine end up stalling (the solenoid should not be energized below 1300 rpm and my idle is a solid 900 rpm one).
Here is a video of what happens :
https://youtube.com/shorts/lgupWjk-Fgo
With some folks on the Early 911s registry forum we checked all the wiring and everything seems OK.
Any idea ?