# Idle control on a Classic

**URL:** <https://community.ecumaster.com/t/idle-control-on-a-classic/5335>\
**Category:** EMU BLACK / CLASSIC\
**Created:** [March 6, 2026, 6:27pm UTC](https://community.ecumaster.com/t/idle-control-on-a-classic/5335 "2026-03-06T18:27:38Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Rob](https://avatars.discourse-cdn.com/v4/letter/r/838e76/32.png) [@Rob](https://community.ecumaster.com/u/Rob)\
**Post date:** [March 6, 2026, 6:27pm UTC](https://community.ecumaster.com/t/idle-control-on-a-classic/5335/1 "2026-03-06T18:27:38Z")

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On a Classic ECU running wasted spark and batch injection (no cam speed sensor) and a basic Alpha-N configuration (TPS, coolant temp, intake temp and engine speed), the Idle Speed control via ignition scatter doesnt work unless the internal MAP sensor is enabled.

Is this correct or is it a bug?