Do all RV8 stepper motors...

[900T-R]

... make that loud buzzing noise (not unlike the 'Next one, please!' buzzer at the public services desk when you need to get your license or passport renewed) when you switch off the ignition? Mine always did, but I'm wondering whether to a priori replace it in the course of tracing an intermittent idling/low speed driveability issue. It's clean, and the workshop's diagnostic tester didn't detect anything untoward...

[daxtojeiro]

In the tests I've carried out with the 14CUX it drives the stepper to the shut position when the ignition is turned off. So yes, all 14CUX controlled setups should do that as far as I can see. Aftermarket ECUs tend to drive it to the shut position on power up,
cheers,
Phil

[900T-R]

Thanks for that

[blitzracing]

As Dax says, it fires 180 stepper pulses into the motor, so it will always reach the end stop as it cant actually do 180 steps, so it sits there buzzing when it hits the end of travel.