BMW Idle problem

EMU BLACK / CLASSIC
1

Hi,
I have the following setup:

BMW M52B28 engine with Jenvey ITB kit.
Engine management is ECUMASTER EMU Black.
Throttle bodies are adjusted and balanced correctly.
All adjustments were done with a fully warm engine, and the idle speed was set mechanically from the throttle bodies.

In EMU software:

  • Idle Valve Type = Disabled

  • In Idle Ignition Control:

    • Enable Ignition Control = enabled

    • Use correction table = enabled

  • In the Idle Target RPM table, the target is set to 1200 RPM at low temperatures and then drops to 950 RPM after 40 °C.

  • In the Idle Ignition Correction table I have values set, for example when RPM error is (-250 → +6°, -150 → +6°, etc.).

Now the problem:

When the engine is cold (around 10 °C), it barely starts and idle speed is only about 500 RPM. When I check the logs, Ignition Correction stays at 0 all the time, meaning no correction is applied at all.

Why does this happen, and what am I missing here?

2

Hi

At cold engine u need more idle airflow. How is this realized in ur setup?

If it is the same airflow than with hot engine, than it is obvious that u stuck at ultra low rpm.

For strange ignition correction unneed to share ur project and a log.

3

This is true, and I don’t have anything in addition to the ITBs that would add more air to the engine. Still, I would like to test what effect increasing ignition advance has when the engine is cold.

Can you explain why this ignition timing correction is not taking place at all?

4

Provide log and projectfile then i can check. U can use google drive for upload.

5

Ok. Thanks.

20251215_2004_32.emub (145.7 KB)