Whine / Buzz from rats nest area
 

Using the elite 2500 with the plug and play wiring adaptor. When I turn ignition on, I hear the fuel pump in the rear (and stop after ~4secs) but there is a constant whine from the rats nest area (sounds kinda like a vacuum cleaner in the distance)
Any ideas what it could be? Apprehensive to try and start until I understand what it is, I'm running the standard haltech base map for series 6 with twins

Have you loaded the proper map into the ECU? The ECU is pulsing one of the solenoids. That’s what’s creating the noise.

Proper map was loaded, it ended up being the idle control valve. I can't find the right setting to make it much quieter (map had 400Hz, FSM states 244Hz, both are noisy)

It shouldn’t be active with the key on, engine off. It’s easy enough to make the change in the mapping to make that happen.

That's a common issue. The ISCs do buzz when driven at a higher frequency.

Thanks both, will look into setting duty to 0 when RPM is 0. Still learning my way around things, strange that haltech hasn't already done it with the basemap

Its not a duty setting or tied to rpm, the valve just needs to be set to be driven at 244 Hz instead of anything higher. It won't matter if its being powered and driven by the ecu with the key on but with the engine off, so long as the output is set at 244Hz.

Skeese